JP2009188968A - Antenna, antenna apparatus and communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna and antenna apparatus each of which is suited for efficient mounting in a communication device and for a wide band for obtaining a high gain uniformly from a low frequency band to a high-frequency band to be used for the communication device, and to provide a communication device using the antenna apparatus. <P>SOLUTION: The antenna includes: a first antenna element having a base and a conductor penetrating through the base; and a second antenna element having a conductor portion having a shape of a plate or a line and a connecting conductor, wherein one end of the conductor is connected to the connecting conductor, and the connecting conductor is connected to a partway on the conductor portion. In such an antenna, because the conductor portion is formed extending along two directions with different lengths from a connection point with the connecting conductor, resonances can be achieved corresponding to approximately λ/4 of two frequencies corresponding to the lengths of extension in the directions. In this structure, the second antenna element can correspond to the GMS band or the like with the first antenna element, and a third antenna element can correspond to the DCS/PCS band or the like. Consequently, a frequency band in which a VSWR is low and a high gain can be obtained, can be expanded. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antenna used in an electronic device having a communication function, in particular, a communication device such as a mobile phone or a mobile terminal device, and further relates to an antenna device using the antenna and a communication device.

  A communication device such as a mobile phone or a wireless LAN has a use frequency band ranging from several hundred MHz to several GHz, and is required to have high gain and high efficiency in the band. Therefore, on the assumption that the antenna used in the band also functions at a high gain in the band, it is required that the antenna is particularly small and low-profile in view of its usage. Furthermore, in recent years, there has been a demand for supporting four bands in the GSM band (810 to 960 MHz), DCS / PCS, and UMTS band (1710 to 2170 MHz), that is, a quad band, in a single mobile phone. There is a need to cover.

Conventionally, chip antennas using dielectric ceramics have been provided as small antennas suitable for mobile communication (for example, Patent Document 1). Under conditions where the frequency is not changed, the chip antenna can be reduced in size by using a dielectric having a higher dielectric constant. In Patent Document 1, the wavelength is shortened by providing a meander electrode. In addition to the relative permittivity εr, an antenna that has been miniaturized by shortening the wavelength by 1 / (εr · μr) ^½ times using a magnetic material having a large relative permeability μr has been proposed ( Patent Document 2).

  Furthermore, an antenna is proposed in which a portion consisting only of a conductor and a portion formed by combining a conductor connected to this portion and ceramics (Ni-Zn ferrite or magnetic material) are arranged in series in the length direction of the antenna. ing. (Patent Document 3)

  The antenna is advantageous in reducing the size and height, but has the following problems with respect to widening the bandwidth. For example, when a helical radiation electrode is used as the electrode, the line capacitance increases and the Q value increases as the number of windings increases. As a result, the bandwidth is narrowed, making it difficult to apply to applications such as quad-band mobile phones that require ultra-wide bandwidth.

JP-A-10-145123 JP-A-49-40046 JP-A-56-64502

  The dielectric chip antenna or the magnetic chip antenna described in the above-mentioned patent document can be downsized and widened in the band. However, in communication devices, particularly portable communication devices, the electronic devices constituting the same Since the component mounting space is limited, it is necessary to further reduce the antenna mounting space. On the other hand, as high a gain performance as possible is required in each frequency band used in a mobile communication device that supports a quad band that requires a particularly wide band. In other words, increasing the number of dielectrics or magnetic parts in order to improve the performance is effective in improving the uniform gain performance, but limits the space in a limited space. Furthermore, in the case of only a chip antenna composed of dielectric ceramics or magnetic ceramics and a conductor provided therein, there is a problem that gain reduction is particularly large at a low frequency side in a frequency band used in portable communication devices. It was.

In addition, if an antenna element in which the dielectric ceramic or magnetic ceramic is combined with the conductor is used, a high gain is obtained within a specific frequency range within the band, but from a low frequency to a high frequency band used in portable communication devices. There is a problem that uniform and high gain cannot be obtained, especially in a high frequency band, VSWR is low, and it is not suitable for applications such as a portable communication device corresponding to a quad band in which a high gain can be obtained over an ultra wide band. there were.

  Accordingly, the present invention provides a built-in antenna and antenna device suitable for efficient mounting in a casing of a portable communication device, ultra-wideband and multiband in a high frequency band, and a communication device using the same. With the goal.

  The antenna of the present invention comprises a first antenna element having a base, a conductor passing through the base, and a second antenna element having a conductor portion such as a plate shape or a line shape and a connection conductor, One end of the conductor of the first antenna element is connected to the connection conductor of the second antenna element, and the connection conductor of the second antenna element is connected in the middle of the conductor portion of the second antenna element. Features. According to this configuration, the antenna includes the conductor portion and the base. Since the conductor portion is formed to extend in different directions in two directions from the connection point with the connection conductor, it can resonate at approximately λ / 4 of two frequencies corresponding to the length. At this time, the second antenna element corresponds to the lower frequency band such as the GSM band with the first antenna element having the base. For example, when the antenna of the present invention is used in a low frequency band such as a GSM band used in a portable communication device, if the conductor portions are provided with different lengths in two directions from the connection point with the connection conductor, a slightly different resonance frequency is obtained. You can have one. As a result, the VSWR is lower than that at a single resonance frequency, and a wide frequency band in which a high gain can be obtained can be obtained. In addition, good antenna characteristics can be obtained in a wide band. Further, the base used in the first antenna element can use not only magnetic ceramics but also insulating materials such as dielectric ceramics, which contributes to miniaturization and a wider band. As the conductor in the base body, a linear conductor or the like is used. Since the conductor penetrates the base body, a capacitance component is hardly formed, and the magnetic part can be effectively functioned as an inductance component.

  The antenna of the present invention includes a first antenna element having a base, a conductor passing through the base, a second antenna element having a conductor portion such as a plate or line, and a connecting conductor, and a plate or wire. A third antenna element having a conductor portion such as a shape and a connection conductor, and one end of the conductor of the first antenna element is connected to the connection conductor of the second antenna element, and the first antenna element The other end of the second antenna element is connected to the connection conductor of the third antenna element, the connection conductor of the second antenna element is connected in the middle of the conductor portion of the second antenna element, and the third antenna element The connection conductor is connected in the middle of the conductor portion of the third antenna element. According to such a configuration, the conductor portions provided at two locations on both ends of the first antenna element are formed to extend in different directions in two directions from the connection points with the connection conductor, so that two locations × 2 It is possible to resonate at approximately λ / 4 of four frequencies corresponding to different lengths in the direction. At this time, the second antenna element corresponds to the lower frequency band such as the GSM band with the first antenna element having the base, and the third antenna element corresponds to the higher frequency band such as the DCS / PCS band. Corresponds to the band. For example, when the antenna of the present invention is used in two separate frequency bands such as the GSM band and the DCS / PCS band that are used in portable communication devices, the conductor portions are provided with different lengths in two directions from the connection point with the connection conductor. If so, it is possible to have two slightly different resonance frequencies. As a result, the VSWR is lower than that at the time of each resonance frequency, and a wide frequency band in which a high gain can be obtained can be obtained. Further, good antenna characteristics can be obtained in a wide band even in two separate frequency bands. Further, the base used in the first antenna element can use not only magnetic ceramics but also insulating materials such as dielectric ceramics, which contributes to miniaturization and a wider band.

  The antenna of the present invention comprises a first antenna element having a base, a conductor passing through the base, and a third antenna element having a plate-like or linear conductor part and a connecting conductor, The other end of the conductor of the first antenna element is connected to the connection conductor of the third antenna element, and the connection conductor of the third antenna element is connected in the middle of the conductor portion of the third antenna element. Features. According to this configuration, the conductor portion of the third antenna element provided at the other end of the first antenna element is formed by extending with different lengths in two directions from the connection point with the connection conductor. , It can resonate at approximately λ / 4 of two frequencies corresponding to the length. At this time, the first antenna element having the base corresponds to a lower frequency band such as a GSM band, and the third antenna element corresponds to a higher frequency band such as a DCS / PCS band. For example, when the antenna of the present invention is used in a high frequency band such as a DCS / PCS band that is used in a mobile communication device, if the conductor portion is provided with different lengths in two directions from the connection point with the connection conductor, the resonance frequencies slightly different from each other It can be made to have two. As a result, the VSWR is lower than that at a single resonance frequency, and a wide frequency band in which a high gain can be obtained can be obtained. In addition, good antenna characteristics can be obtained in a wide band. Further, the base used in the first antenna element can use not only magnetic ceramics but also insulating materials such as dielectric ceramics, which contributes to miniaturization and a wider band.

  The substrate may be composed of a plurality. That is, an antenna element having a base can be divided into a plurality of bases. According to this configuration, the conductors of the plurality of antenna elements are electrically connected in series, and the plurality of antenna elements constitute one antenna. Therefore, the individual length of the antenna element having the base can be made smaller than the length of the base necessary for the antenna characteristics. As a result, impact resistance can be improved, and the antenna elements can be arranged in accordance with the mounting space because the antenna elements are connected in series by conductors of the antenna elements. Therefore, it is possible to increase the degree of freedom in shape of the antenna arrangement, and the antenna can be efficiently mounted on a portable communication device or the like.

  It is preferable that the surfaces of the conductor portions of the second antenna element and the third antenna element stand upright with respect to the ground plane of the substrate. In such a configuration, since the area where the surface of the conductor portion and the ground portion such as the main circuit board face each other is reduced, the capacitance component does not increase, and the ground portion has an antiphase current that cancels the resonance current generated in the conductor portion. Is less likely to occur and the antenna gain is less likely to decrease.

  The conductor portions and connection conductors of the second antenna element and the third antenna element are preferably made of a metal conductive plate, a metal conductive foil, or a metal conductive wire. In such a configuration, since the second antenna element is composed of a metal conductive plate, a metal conductive foil, or a metal conductive wire, it has a larger number of metal conductor portions than an antenna composed of only a chip, and the radiation efficiency of electromagnetic waves is increased. High antenna characteristics can be obtained.

  The conductor portions of the second antenna element and the third antenna element preferably have a U shape, an arc shape, or an L shape. In such a configuration, the antenna element can have a U shape, an arc shape, or an L shape depending on the mounting space. Therefore, the degree of freedom of antenna arrangement can be increased. Moreover, since the occupation area can be reduced, it is advantageous to fit in a limited space. Furthermore, by securing a long conductor so as to surround the first antenna element, it is possible to cope with a terrestrial digital television broadcast band having a frequency lower than that of the GSM band and a wide band.

  The connection conductor may include a feeder line. In such a configuration, since the feeder line also serves as the connection conductor, it can be regarded as a part of the antenna element. Therefore, it is possible to resonate at approximately λ / 4 of the operating frequency corresponding to different lengths using the feeder line, which can contribute to further miniaturization.

  In addition, the distance between one side of the conductor part parallel to the end of the ground part on the main circuit board and the end of the ground part on the main circuit board is in the range of 6 to 10 mm. It is preferable that the close end portion is close to the ground portion. According to such a configuration, the main portion of the conductor portion and the ground portion can be separated from each other by a certain amount, so that the parasitic capacitance that does not contribute to radiation does not increase, and a reduction in the radiation efficiency of the antenna can be prevented.

  It is preferable that the plurality of conductors of the base body are connected to each other, and are arranged in a linear shape, a meander shape, an L shape, a crankshaft shape, or an arc shape. According to this configuration, since the antenna elements are connected in series by the conductors of the antenna elements, the arrangement of the antenna elements can be changed according to the mounting space. Therefore, it is possible to increase the degree of freedom in the shape of the antenna arrangement, and the antenna can be efficiently mounted on a portable communication device or the like in space.

  The antenna element is preferably fixed with a resin or a resin case. In such a configuration, since the antenna element is fixed with resin, impact resistance can be improved. The resin may be filled after the antenna element is attached. Further, the antenna element may be mounted on an antenna mounting member formed of resin in advance.

  Furthermore, the antenna device of the present invention preferably includes the antenna and a substrate on which the antenna is mounted. According to such a configuration, it is easy to hold and handle the arrangement of the chip antenna by configuring a so-called sub-board that mounts the antenna on an individual board.

  Furthermore, the antenna device of the present invention preferably includes the antenna or the antenna device. According to such a configuration, it can be used for communication devices such as mobile phones, wireless LANs, personal computers, terrestrial digital television broadcast-related devices, and the like, which contributes to widening the bandwidth in communication using these devices.

  According to the present invention, an antenna comprising a conductor portion and a base (magnetic chip or dielectric chip) advantageous for downsizing and widening of the band, particularly a stable high gain from a low frequency to a high frequency band of a portable communication device. Can be obtained. As a result, it is possible to provide a built-in antenna suitable for ultra-wide band and multi-band including a conductor part and a base body suitable for efficient mounting in a portable communication device. In addition, by using the antenna, it is possible to provide an antenna device and a communication device that are excellent in space flexibility of antenna mounting.

  Hereinafter, although this invention is demonstrated, showing specific embodiment, this invention is not limited to these embodiment. In addition, the same code | symbol is attached | subjected about the same member.

FIG. 1 shows an example of an embodiment of an antenna according to the present invention. An antenna a in FIG. 1 is an antenna having a base (magnetic chip or dielectric chip) and a conductor. The antenna can be used by being mounted on a substrate. FIG. 1 is a plan view of the antenna according to the present embodiment (corresponding to a view seen from above the substrate surface when the antenna is mounted on the substrate).
As shown in FIG. 1, the antenna of the present embodiment includes a first base 10, a first antenna element 4 having a conductor 7 provided therein, a plate-like conductor portion 100, and a connection conductor 12. The connecting conductor 12 is connected to the middle of the plate-like conductor portion 100. Further, when the conductor portion 100 is formed of a metal conductive foil or a wire (linear shape), the degree of freedom of the shape of the antenna can be further improved, and the space can be saved. In the configuration shown in FIG. 1, one side of the conductor part 100 is arranged in parallel with the first base 10 in the longitudinal direction, and the other end on the power feeding side of the conductor 7 of the first base 10 is One end, which is connected to the power supply line 11 and is on the non-power supply side, is connected and arranged with the conductor portion 100 and the linear connection conductor 12. In the first antenna element 4, the conductor 7 passes through the base body 10. Of course, the conductor 7 and the connection conductor 12 may be connected by a single continuous conductor. That is, the connecting conductor 12 is not considered as a constituent member of the second antenna element 1 but can be considered as a common constituent member of the second antenna element 1 and the first antenna element 4. The same applies to the following embodiments. If it is constituted by continuous and integral linear conductors, the number of connections can be reduced, the manufacturing process of antennas and communication equipment can be simplified, and product reliability can be improved. In the configuration shown in FIG. 1, since there is no third antenna element 21, the conductor portion 100 can be secured long so as to surround the first antenna element 4. Therefore, it is possible to cope with a terrestrial digital television broadcast band having a lower frequency and a wider band than the GSM band.

  Next, returning to FIG. FIG. 2 shows an example of an embodiment of an antenna according to the present invention. 2 is an antenna having a base (magnetic chip or dielectric chip) and a conductor. The antenna can be used by being mounted on a substrate. FIG. 2 is a plan view (corresponding to a view seen from above the substrate surface when the antenna is mounted on the substrate). The antenna shown in FIG. 2 includes a first antenna element 4 having a first base 10, a conductor 7 provided therein, a plate-like or linear conductor portion 100, and a connecting conductor 12. 2 antenna elements 1 and a third antenna element 21 having a plate-like or linear conductor portion 200 and a connecting conductor 15. Furthermore, one end of the conductor of the first antenna element 4 is connected to the connection conductor 12, and the other end of the conductor of the first antenna element 4 is connected to the connection conductor 15. The connection conductor 12 is connected in the middle of the conductor portion 100, and the connection conductor 15 is connected in the middle of the conductor portion 200. In addition, when the conductor portion is formed of a metal conductive foil or a wire (linear shape) instead of a plate shape, the degree of freedom in the shape of the antenna can be further improved and the space can be saved. In the configuration shown in FIG. 2, one side of each of the conductor portion 100 and the conductor portion 200 is arranged in parallel with the first base 10 in the longitudinal direction, and the power supply side of the conductor 7 of the first base 10. The other end and the conductor portion 200 are connected by a linear connecting conductor 15, and the one end on the non-feeding side is connected and arranged by the conductor portion 100 and the linear connecting conductor 12. In the first antenna element 4, the conductor 7 passes through the base body 10. Of course, the conductor 7 and the connection conductors 12 and 15 may be connected by a single continuous conductor.

  FIG. 4 shows an example of an embodiment of an antenna according to the present invention. 4 is an antenna having a base (magnetic chip or dielectric chip) and a conductor. The antenna a can be used by being mounted on a substrate. The antenna a shown in FIG. 4 includes a first antenna element 4 having a conductor 7 provided through a base 10, a connection conductor 15, and a third antenna element 21 including a conductor portion 200. The other end of the conductor 7 of the first antenna element 4 on the power feeding side is directly connected to the conductor portion 200 via the connection conductor 15, and the conductor portion is also different from the connection point of the connection conductor 15. 200 is directly connected. The conductor part 200 is formed in a plate shape and a substantially L shape. In addition, when the conductor portion is formed of a metal conductive foil or a wire (linear shape) instead of a plate shape, the degree of freedom in the shape of the antenna can be further improved and the space can be saved. In the first antenna element 4, the conductor 7 passes through the base body 10. Of course, the conductor 7 and the connection conductor 15 may be connected by a single continuous conductor. Similarly to FIG. 3, the connection conductor 15 can be connected to the middle of the feeder line 11.

  The antenna a of FIGS. 1 to 4 is arranged such that one side of the base body 10 and the conductor part 100 in FIGS. 1 to 3 is separated from the ground part end 40a in FIGS. In addition, since the conductor is not wound around the base like the dielectric chip antenna or magnetic chip antenna having a helical electrode, the base 10 portion is difficult to form a line capacitance component as described later. This is an excellent configuration for expanding the range. 1 to 3, the connection conductor 12, which is a radiation electrode, is connected to the end of the conductor 7 of the first antenna element 4, which is the non-feeding side, in the middle of the conductor portion 100. 2 to 4, the connection conductor 15 is connected in the middle of the conductor portion 200 to the other end side which is the power feeding side. Therefore, the number of conductors is larger than that of the conventional dielectric chip antenna and magnetic chip antenna. That is, since the conductor portions 100 and 200 are provided, the radiation resistance between the main circuit board and the ground portion 40 is increased, and the radiation efficiency is improved. In particular, the conductor portion can be formed to extend in a length corresponding to approximately λ / 4 of the used frequency, which is slightly different in two directions from the connection point with the connection conductor. For example, as shown in FIG. Can be resonated with two frequencies f1 and f2. As a result, the VSWR is lower than that at a single resonance frequency, and a wide frequency band in which a high gain can be obtained can be obtained. In addition, good antenna characteristics can be obtained in a wide band.

  In the antenna a in FIGS. 1 to 4, the conductor portion 100 having an overall L-shape and / or the other end side that is the feeding side and the one end side that is the non-feeding side of the conductor 7 of the first antenna element 4. 200 each connect. That is, in FIGS. 2 to 4, the other end side, which is the feeding side of the conductor 7 of the first antenna element 4, is connected to the middle of the conductor portion 200 via the connection conductor 15 to form the third antenna element 21. In FIG. 1 to FIG. 3, the one end side, which is the non-feeding side of the conductor 7, is connected in the middle of the conductor portion 100 via the connection conductor 12, and the second antenna element 1 is formed. The overall shape of the second and third antenna elements is formed in a substantially T shape by the conductor portion and the connection conductor. The overall shape of the second and third antenna elements may be a substantially U shape, a substantially inverted V shape, a substantially Y shape, or the like in accordance with the housing shape of the mobile communication device.

  In addition, the conductor part is branched into n (n = 1, 2,...) At the connection point between the conductor part and the connection conductor, and the length of each of the n conductor parts is slightly changed, so that each frequency is changed. Resonance can be achieved at approximately λ / 4. As a result, n resonance frequencies slightly different within one band are obtained, so that the larger the number of n, the lower the VSWR and the wider the frequency band in which a high gain can be obtained. In this case, interference between the conductor portions is likely to occur, but the branched conductor portions may be separated from each other for a certain period.

  A transmission / reception circuit (not shown) or the like (not shown) is connected to the conductor portion 100 via the feeder line 11 to constitute an antenna device. In FIG. 2, the connection conductor 15 is connected to the conductor portion 200. The feeder line 11 is also connected to the conductor part 200. However, the feeder 11 is connected to a point different from the connection point of the connection conductor 15 to the conductor part 200. Further, as shown in FIG. 3, the other end, which is the power feeding side of the conductor 7, can be connected to the middle of the power feeding line 11. The material of the connection conductors 12 and 15 can also be formed of a conductive metal in the form of a wire, a plate, or a foil printed on a substrate.

  1 to 6, the connection conductor 12 and the plate-like conductor portion 100 erected on one end side of the first antenna element 4 are substantially T-shaped, and the connection conductor 15 and the other end stand on the other end. Each is formed so as to be substantially T-shaped with the provided plate-like conductor portion 200. Since the surface of the plate-like conductor portion 100 is erected so as to be perpendicular to the surface of the main circuit board on which the ground portion 40 is formed, it is more metal than an antenna having only a base (magnetic material chip or dielectric chip). It will have many conductor parts. As a result, the radiation resistance is reduced and the radiation gain of the electromagnetic wave is increased in a wide frequency band. However, as the surface area of the conductor portions 100 and 200 is increased in order to increase the radiation gain of the electromagnetic wave, the conductor portion is erected, so the area facing the ground portion 40 of the main circuit board increases and the capacitance component increases. When the capacitance component increases, an anti-phase mirror image current that cancels the resonance current of the antenna generated in the conductors 100 and 200 tends to be generated in the ground unit 40, and not only the gain of the antenna is reduced, but also the band. The width is also narrowed. Therefore, it is preferable that the area of the plate-like conductor portion 100 and the distance W from the ground portion end portion 40a are determined in a balanced manner so that the radiation efficiency is increased. Further, as a method of not increasing the capacitance component other than ensuring the distance W at a constant interval, the conductor portions 100 and 200 may be formed of a linear conductor made of a metal conductive foil or a metal conductive wire formed on the substrate. By this method, since the surfaces of the plate-like conductor portions 100 and 200 are parallel to the ground portion 40, radiation resistance can be reduced. Therefore, even when the conductor portions 100 and 200 and the ground portion 40 are close to each other, the VSWR is reduced. A low frequency band can be expanded.

  Next, a method for determining the optimum shape of the antenna a and the positional relationship with the components will be described. First, the shape of the conductor portion is formed in a U shape, an arc shape (arch shape), or an L shape in accordance with the space and shape of the housing. Then, the overall required length of the substrate is determined, and the number of divisions and the arrangement are determined according to the space. The positions of the conductor and the base are examined so that a bandwidth can be secured in which the radiation gain is maintained above a certain value. Next, in order to reduce the capacitance component, it is examined whether the shape of the conductor portion should be a plate shape, a line shape, or the like based on the constraints of the housing. Next, a distance W from the surface of one side of the conductor portion facing the ground portion end portion 40a is determined.

  FIG. 5 shows another example of the embodiment of the antenna according to the present invention. The antenna a in FIG. 5 is an antenna having a magnetic chip or dielectric chip as a base and a conductor portion. The antenna can be used by being mounted on a substrate. FIG. 5 is a plan view (corresponding to a view from above the substrate surface when the antenna is mounted on the substrate). The antenna shown in FIG. 5 includes a first base 10, a first antenna element 4 having a conductor 7 provided therein, a second base 8, and a conductor 5 provided therein. 4 antenna elements 2, a second antenna element 1 composed of a conductor part 100 and a connection conductor 12, a third antenna element 21 composed of a conductor part 200 and a connection conductor 15. In the configuration shown in FIG. 5, the bases 10 and 8 that are aligned in a straight line and the sides of the conductor portions 100 and 200 are spaced apart in parallel in the longitudinal direction. The conductor 7 of the base 10 and the conductor portion 100 are connected by a connecting conductor 12, the other end of the conductor 7 of the base 10 on the power feeding side and the one end of the conductor 5 of the base 8 on the non-feeding side are connected by a connecting conductor 13. The other end of the eight conductors 5 on the power feeding side is connected to the conductor portion 200 via the connection conductor 15. The conductor unit 200 is connected to a transmission / reception circuit or the like (not shown) via the feeder line 11 to constitute an antenna device. In the first antenna element 4, the conductor 7 provided in the first base 10 penetrates the base 10, and in the fourth antenna element 2, the conductor 7 is provided in the second magnetic base 8. The conductor 5 passes through the base body 8. Of course, the connection conductor 12, the conductor 5, the connection conductor 13, the conductor 7, and the connection conductor 15 may be connected by a single continuous conductor. In addition, as shown in FIG. 6, the other end side which is the electric power feeding side of the said conductor 5 can also connect the connecting conductor 15 in the middle of the electric power feeding line 11. As shown in FIG.

  In the antenna a of FIG. 5, the conductor portion 100 is disposed at a predetermined distance from the ground portion end portion 40a as in the case of FIG. The conductor of the antenna a penetrates the base body, and the conductor is not wound around the base body like a dielectric chip antenna or a magnetic chip antenna having a helical electrode. Therefore, as will be described later, it is difficult to form a line capacitance component of the helical electrode, and the structure is excellent in expanding the band. Further, since the base is divided and each antenna element is connected by connecting conductors, they are arranged in a straight line in FIG. 5, but they are arranged in accordance with the mounting space such as in the vertical direction as shown in FIG. Can be changed. In addition, since the length of each base can be reduced by using a structure in which the base is divided, the structural strength is increased and it is difficult to break, contributing to the improvement of the reliability of the antenna. In other words, the configuration described above is an antenna using a base, but has a very high degree of freedom in mounting. The reason why the magnetic chip antenna and the dielectric chip antenna having such a divided structure are possible will be described later.

  In the case of the antenna a in FIGS. 5 and 6, the other end, which is the power feeding side, of the conductor 5 of the fourth antenna element 2 is connected via the connecting conductor 15 to the conductor portion 200 that is a radiation electrode. That is, the connection conductor 15 and the conductor part 200 are formed in an approximately T shape as an equivalent shape of the antenna element, and constitute the third antenna element 21. Further, one end of the first antenna element 4 that is the non-feeding side of the conductor 7 is connected to the conductor portion 100 that is a radiation electrode via the connection conductor 12. That is, the connection conductor 12 and the conductor portion 100 are formed in an approximately T shape as an equivalent shape of the antenna element, and constitute the second antenna element 1. This configuration has two surfaces of the conductor portions 100 and 200, and the radiation resistance between the ground portions 40 of the main circuit board is increased as compared with the case where there is one conductor portion, so that the radiation efficiency is improved. In particular, in an antenna configured only with a substrate, the gain is reduced. According to this configuration, the presence of the conductor portion can prevent the gain from being reduced. Further, since the length of each conductor portion extending from the connection point with the connection conductor can be determined, the conductor portion can easily resonate with a plurality of intended frequencies. The conductor unit 200 is connected to a transmission / reception circuit (not shown) via the feeder line 11 to constitute an antenna device. When the conductor portions 100 and 200 are formed in a plate shape, the plate surface is perpendicular to the main circuit board surface on which the ground portion 40 is formed for the same reason as in the first embodiment. It is preferable that the surface and the ground portion end portion 40a be disposed with a certain distance W secured. Then, when determining the optimum shape of the antenna a and the positional relationship with the component parts, it is the same as in the first embodiment, and hence the description thereof is omitted below.

  When only one resonance frequency is required in the conductor portion, the conductor portions 100 ′ and 200 are formed to extend in only one direction from the connection point between the one end and the other end of the conductor 7 as shown in FIG. You can also. The extended portion may be a straight line, or may be appropriately bent according to the shape of the casing. A broken line portion indicates an adjustment conductor portion 100 'for adjusting the resonance frequency. In this case, the base 10, the feed line 11 (connection conductor 15), and the adjustment conductor portion 100 ′ resonate in the GSM band, and the feed line 11 (connection conductor 15) and the conductor portion 200 have, for example, DCS / PCS and UMTS bands. Resonates. In this example, the connection conductor 15 at first glance appears to be connected to the end of the conductor part 200, but the length of the connection line 15 including the power supply line 11 and the connection conductor 15 is λ / 4. Since it is included, it can be considered that it is connected in the middle of the conductor. The length of the adjustment conductor portion 100 ′ surrounded by a broken line in FIG. 7 can be appropriately changed depending on the target frequency range in the GSM band. Further, when the conductor portions 100 'and 200 are formed not by a plate shape but by a metal conductive foil or a wire (wire shape), it is possible to further improve the shape freedom of the antenna and to save space. Of course, the conductor 7, the feeder 11 (connection conductor 15), and the conductor portions 100 ′ and 200 may be connected by a single continuous conductor.

  Further, when a dielectric is used as the base in the base of the first antenna element 4 or the fourth antenna element 2, the base has the dielectric because the dielectric exists around the entire circumference of the conductor penetrating the dielectric. Effective dielectric constant increases. When a magnetic material is used as the substrate, the magnetic material exists around the entire circumference of the conductor that penetrates the magnetic material, so that the magnetic field can be made coaxial around the conductor, so that the magnetic permeability of the substrate is increased. Therefore, even if the conductor is a dielectric material or a magnetic material, the wavelength shortening effect is produced and the entire antenna can be downsized. When the conductor is wound around the base, the entire antenna element can be reduced in size when the same conductor length as that required for winding the conductor is secured, compared to when the conductor does not penetrate. Can be planned. Further, the other end and one end of the conductor can be used for electrical connection and joining with other circuit elements and electrodes, and the degree of freedom in design and the fixing strength can be increased. In addition, in the structure shown in FIGS. 1-8, the both sides of each conductor protrude from the base | substrate. Both sides of each conductor may not necessarily protrude, but in this case, it is necessary to provide an external electrode for connection with the conductor. In such a case, for example, as shown in FIG. 10, the antenna elements may be connected in series by soldering the external electrodes of the antenna elements to the electrodes provided on the substrate together with the external electrodes of the other antenna elements. Moreover, the electrode which forms the connection conductor provided on the board | substrate can also be formed by printed conductor patterns, such as metal conductive foil.

  As described above, in the configurations shown in FIGS. 1 to 8, the conductors and the connection conductors are configured by a single conductor, and thus protrude from the other end on the non-feeding side of the base 8. The conductor 5 and the conductor 7 protruding from the other end on the power supply side of the substrate 10 are common, and this also serves as the connection conductors 12, 13, and 15. The connecting conductor and the protruding portion of the conductor do not necessarily have to be configured by a single conductor. For example, the conductor 7 that passes through the first base 10 and protrudes from one end on the power supply side of the base 10 and the one end that passes through the base 8 and that protrudes from the non-feeding side of the conductor 5 are connected to the conductor. May be connected using a connecting conductor of another member. Further, as the connection conductor of the separate member, an electrode provided on the substrate as shown in FIG. 10B is used, and the protruding connection conductors 13 and 14 are soldered to the conductor portion of the substrate 16. It may be a configuration. However, the number of connections can be reduced if each conductor and each connection conductor is constituted by a single conductive wire, that is, a continuous, integral linear conductor, and a process for manufacturing an antenna or communication device. Can be simplified and product reliability can be improved. In the case of the configuration of FIG. 10B, the two bases are arranged so that the longitudinal direction is parallel to one side of the conductor portions 100 and 200, and the base 8 and the base 10 are connected using the connection conductor 13 and the connection conductor 12 is connected. The base body 9 and the conductor part 100 (not shown) are used and the base conductor 10 and the conductor part 200 (not shown) are connected and arranged using the connection conductor 15. As for the overall arrangement, it is only necessary that the bases and the conductors are arranged at appropriate intervals between the bases, and the bases, the connecting conductors and the conductors are connected in series.

  In the configuration shown in FIG. 6, each of the conductors and each of the connection conductors may be configured by a single conducting wire as in the configuration shown in FIG. 3, or the conducting wires may be connected to each other. The two base bodies 8 and 10 are arranged so that the longitudinal directions thereof are aligned in parallel with each side of the conductor portions 100 and 200. The connection conductor 13 connects the base 8 and the base 10. The connection conductor 15 connects the base body 8 and the conductor part 200. The connection conductor 12 connects the base body 10 and the conductor portion 100. And the whole comprised by a base | substrate, a connection conductor, and a conductor part is formed in the substantially meander shape. Although the connection conductor 15 is connected in the middle of the feeder line 11 as in FIG. 3, it can also be directly connected to the conductor portion 200 via the connection conductor 15 as shown in FIG.

  An example of another embodiment of the antenna according to the present invention will be described with reference to FIG. In the configuration shown in FIG. 6, each side of the base body 10, the base body 9, the base body 8, and the conductor portions 100 and 200 is spaced apart in parallel in the longitudinal direction, but has the same configuration as the fourth antenna element 2, for example. The fifth antenna element 3 (not shown) may be arranged below the fourth antenna element 2. Further, a plurality of sixth antenna elements 3 ′ (not shown) having the same configuration as that of the fifth antenna element 3 are provided below the fifth antenna element 3 so as to be further spaced apart in parallel, and connected in series by connecting conductors. It may be arranged in a meander shape as a whole.

  The base materials used for the antenna elements 2, 3, 4 and the antenna element 3 'may be the same or different. In the first antenna element 4, the conductor 7 provided inside the first base 10 passes through the base 10, and in the fourth antenna element 2, the conductor provided inside the second base 8. 5 penetrates the base 8, and in the fifth antenna element 3, the conductor 6 (not shown) provided inside the third base 9 (not shown) penetrates the base 9. Of course, the feeder 11, the conductor 6, the connecting conductor 14, the conductor 5, the connecting conductor 13, the conductor 7, and the connecting conductor 12 are configured to be connected in series in this order. good. The other end on the power feeding side of the conductor 6 is connected in the middle of the power feeding line 11 as in FIG. 2, but can also be connected to the conductor portion 200 via the connection conductor 15.

Here, when the base is a magnetic chip, ceramics is used as the base material of the base, so that it may crack when an excessive impact is applied. In communication devices, particularly mobile communication devices, impacts such as dropping are applied, so that higher impact resistance is required to increase the reliability of the antenna. If the longitudinal direction of the magnetic substrate is shortened, the reliability of the magnetic substrate against external force can be increased. For example, the relational expression of the bending strength S with respect to the maximum load N when the width w, the thickness t, and the fulcrum distance d is S = 3Nd / (2 wt ² ). That is, the maximum load that can be endured is N = 2Swt ² / (3d), which is proportional to the ratio of the width to the distance between the fulcrums. Since the direction of the external force applied to the magnetic chip antenna is not constant when the communication device is dropped, a cube is considered to be an ideal shape in terms of strength. In this case, the ratio w / d between the width and the distance between the fulcrums (here, corresponding to the length of the magnetic substrate) is 1. Since the antenna according to the present invention can be divided into a plurality of antenna elements, the strength can be increased by bringing this w / d closer to 1 (ie, closer to a cube). Next, a specific example in which the substrate is divided will be described.

  The configuration having the antenna elements 2, 3, 3 ′, 4 can be regarded as one antenna having a linear conductor penetrating the base and the base portion of the antenna element being divided into three parts. The number of antenna elements is not limited to 1 or 2, and can be 3 or more. That is, by increasing the number to 3, 4, 5,. As a result, it is possible to obtain a degree of freedom in antenna arrangement without deteriorating the performance of the antenna using the body.

  As described above, in the configuration divided into the antenna elements 2, 3, 3 ′, and 4, the conductors 9 and the connection conductors are configured by a single conductor, and thus the base 9 (not shown). ) And the conductor portion protruding from the other end on the power supply side of the base 8 are common, and also serves as the connection conductor 14. Similarly, the conductor portion protruding from one end on the non-feeding side of the base 8 and the conductor portion protruding from one end on the feeding side of the magnetic base 10 are common, and these portions also serve as the connection conductor 13. Yes. However, the connecting conductor and the protruding portion of the conductor do not necessarily have to be constituted by a single conducting wire. For example, a conductor that passes through the base and protrudes from the end of the base may be connected to a conductor that passes through and protrudes from another base using a connection conductor that is a separate member from the conductor. Further, as the connection conductor of the separate member, an electrode provided on a substrate as shown in FIG. 10 may be used, and the protruding conductor portion may be soldered to the electrode. Alternatively, the conductors may be connected by using a substrate having a plurality of through holes and electrodes that electrically connect the through holes, inserting the protruding conductor portions into the through holes, and soldering them. . According to this method, the base (chip) can be more firmly fixed on the substrate used in the communication device. However, if the respective conductors and the respective connection conductors are constituted by continuous linear conductors, the number of connection points can be reduced, the manufacturing process of the chip antenna and the communication device can be simplified, and the product reliability can be reduced. It is possible to improve the performance.

  Furthermore, the arrangement of the first antenna element 4, the fourth antenna element 2, the fifth antenna element 3 (not shown) and the sixth antenna element 3 ′ (not shown) is bent or It may be arranged in a meander shape, an L shape, a crankshaft shape, or an arc shape. According to such a configuration, since the antenna has a connection conductor portion between the plurality of antenna elements, the antenna element and the antenna element are connected via the connection conductor portion, and the antenna element and the antenna element are bent or meandered, L-shaped, crank It can be arranged in an axial shape or an arc shape. Arranging in a bent shape means that the longitudinal directions of the antenna element and the antenna element have a predetermined angle with each other. For example, it is V-shaped, U-shaped or the like. The meander shape is a state in which the antenna element and the antenna element are connected by a connection conductor that is folded back in a substantially S shape, and the antenna element and the antenna element are arranged so that their longitudinal directions are parallel to each other. Further, another embodiment of the antenna according to the present invention will be described with reference to FIG. In the configuration shown in FIG. 8, the direction in which the plurality of bases become meanders is arranged in a direction rotated 90 degrees from FIG. In this case, the first antenna element 4, the fourth antenna element 2, the fifth antenna element 3 and the like are preferably 3 to 8 mm in length and 2 to 4 mm in diameter. With such a configuration, the antenna device can be mounted in a mounting space defined by a curved surface, such as an end portion in a portable communication device housing, so that the communication device can be used more efficiently in space use. .

  Next, individual antenna elements will be described below. FIG. 9 shows an example of an antenna element in which the base constituting the antenna is a magnetic chip. 9A is a perspective view, FIG. 9B is a cross-sectional view including a conductor along the longitudinal direction, and FIG. 9C is a cross-sectional view in a direction perpendicular to the longitudinal direction. The configuration shown in FIG. 9 is an example of a fourth antenna element. The linear conductor 5 penetrates the rectangular parallelepiped base 8 in the longitudinal direction. That is, the linear conductor 5 extends along the outer surface of the base body that is positioned so as to surround the conductor, such as a rectangular parallelepiped side face or a cylindrical outer peripheral face, and penetrates between both longitudinal end faces of the base body. . In the substrate, it is more preferable that there is no conductor portion in a direction perpendicular to the extending direction of the linear element of the linear conductor. For example, in the configuration of FIG. 6, both ends of the conductor, that is, one end and the other end of the conductor 5 protrude from the base 8. Since only a straight solid conductor 5 exists as a conductor portion inside the base body 8, an ideal structure for reducing the capacitance component is obtained. Since one linear conductor functioning as a radiation conductor passes through, the conductor does not have a substantially opposing portion inside the substrate, and is particularly effective in reducing the capacitance component. From this point of view, only one conductor penetrating the substrate is preferable. However, in the case where the influence of the capacitance component is small due to a sufficient interval or the like, it is possible to adopt a configuration in which another conductor penetrates or is buried in addition to one through conductor. This structure can of course be applied to the first, fourth, fifth and sixth antenna elements.

  Further, since the linear conductor 5 penetrates the base body 8, the conductor penetrates equivalent to the conductor length required to wind the conductor as compared with the case where the conductor is wound around the base body. When the length is secured, the entire antenna element can be reduced in size. Furthermore, since the linear conductor 5 penetrates the base body 8, it is possible to join and electrically connect to other antenna elements, circuit elements, and electrodes at both ends of the linear conductor 5, and the degree of freedom in design. Is expensive. The linear conductor preferably penetrates the central axis of the substrate while maintaining a constant distance from the outer surface of the substrate so that the magnetic field circulates around the conductor. In the configuration shown in FIG. 10A, the linear conductors 5, 6, 7 penetrate the central axis of the magnetic base in the longitudinal direction of the bases 8, 9, 10. That is, in the cross section perpendicular to the longitudinal direction of the base bodies 8, 9, 10, the linear conductors 5, 6, 7 are located on the central axis.

Next, although the point which the structure of the antenna which concerns on this invention is excellent is demonstrated, since this invention is an antenna which added conductor parts, such as plate shape and a linear form, to a magnetic chip antenna base, it is a magnetic chip first. The effect of the antenna portion will be described. For example, the frequency bands of GSM band (810-960 MHz), DCS / PCS and UMTS bands (1710-2170 MHz) used in mobile phones are as wide as 150-500 MHz, and these frequency bands are further separated by 1000 MHz. In order to obtain a predetermined communication quality over the entire band, it is necessary to maintain a constant gain over the entire frequency band. To increase the bandwidth, it is necessary to lower the Q value of the antenna. The Q value is represented by (C / L) ^{1/2 when the} inductance is L and the capacitance is C. C needs to be lowered. When a dielectric is used as the substrate, it is necessary to increase the number of windings of the conductor in order to increase the inductance L. However, since the increase in the number of windings causes an increase in the capacitance between the lines, the Q value of the antenna is effective. Can not be lowered.

  In the present invention, as described above, an antenna element having a configuration in which a linear conductor penetrates the magnetic substrate, which is effective for reducing the capacitance component, is adopted. Therefore, the inductance L can be increased with permeability without increasing the number of windings. Can be raised. Therefore, an increase in line capacitance due to an increase in the number of windings can be avoided, the Q value can be lowered, and a particularly remarkable effect can be exhibited in widening the antenna band. For example, in the case of the conductor 5 of the fourth antenna element 2, the magnetic path is formed in the base so as to go around the conductor 5, so that a closed magnetic circuit is formed. The inductance component L obtained by this configuration depends on the length and cross-sectional area of the base portion covering the conductor 5. Therefore, the fourth antenna element 2 has a configuration in which the conductor 5 has an antenna element penetrating the base 8 on the central axis of the cross section, so that the L component can be efficiently secured and the antenna can be downsized. it can. Of course, the same effect can be obtained by using a dielectric as the substrate. However, in the case of a dielectric, the line capacitance increases due to the winding of the conductor, so it is more advantageous to use a magnetic substrate to broaden the frequency band. It is.

  Furthermore, as described above, the magnetic paths in the antenna elements 2, 3, 3 ′, 4 according to the present invention are formed so as to go around the central axes of the conductors 5, 6, 7, so that the base body is the length of the conductor. Even if it is divided into a plurality of directions, the influence of the division on the formation of the inductance component L is extremely small in principle. Therefore, the antenna can be configured by dividing the base into a plurality of parts. On the other hand, when a helical electrode is wound around a base such as a dielectric, the magnetic path in the base is formed in the axial direction of the coil (through the longitudinal direction of the base). Is divided, the magnetic path is divided and the L component is significantly reduced. Therefore, even if the helical electrodes are formed on the divided substrates, it is impossible to configure a chip antenna in which the substrate is simply divided into a plurality of substrates.

  Here, the effect obtained by combining the conductor portion and the substrate (magnetic chip) will be described in detail. With an antenna consisting only of a conventional substrate and a conductor passing through the substrate, the gain of the entire band can be improved, but the gain is slightly inferior compared to an antenna composed only of a conductor portion such as a plate or wire, The gain decreases greatly at frequencies lower than the center frequency of each frequency band used in the mobile communication device. Therefore, as described above, the gain can be improved and the respective frequency bands can be widened by providing a conductor portion such as a plate or wire on the feeding side and / or non-feeding side of the conductor of the first antenna element 4. . Furthermore, a plate-like or linear conductor part 200 is connected to the power feeding side of the conductor of the first antenna element 4, and a connection conductor is connected in the middle of the conductor part, and the use differs slightly in two directions from the connection point. By extending and providing a length corresponding to approximately λ / 4 of the frequency, for example, as shown in FIG. 21, it is possible to easily resonate with two frequencies f1 and f2 corresponding to the length. Can be expanded. As a result, the gain at the lower frequency in the high frequency band such as the DCS / PCS and UMTS bands can be improved as compared with the antenna composed only of the base and the conductor passing through the base. Further, by providing a conductor portion 100 such as a plate or wire on the non-feeding side of the conductor of the first antenna element 4, the first antenna element 4 can be combined with the first antenna element 4 in a low frequency band such as the GSM band. The gain at the lower frequency can also be improved. In addition, since multiple resonances occur between the base and the portion of the conductor part 200 parallel to the base, the VSWR is low and the gain is high over the DCS / PCS and UMTS bands, which are wide in the high frequency band. Can be obtained. That is, the frequency band with a low VSWR is expanded in each band, and the radiation gain of the electromagnetic wave can be increased.

  The conductor can be routed outside the substrate by forming a printed electrode (metal conductive foil) on the surface where the conductor of the substrate appears. That is, the printed electrode formed on the surface and the electrode printed on the substrate surface in contact with the surface can be fixed by soldering. On the other hand, from the viewpoint of simplifying the manufacturing process and suppressing an increase in capacity, it is preferable to carry out the wiring by soldering or the like using the protruding end of the conductor. In addition, when performing the outside of a base | substrate with a printing electrode, it is desirable for this printing electrode to make the area and opposing part as small as possible. When both ends of the conductors 5 and 7 protrude as in the configuration of FIG. 6, the connection conductors 13 and 15 connected to the conductor 5, the connection conductors 12 and 13 connected to the conductor 7, and the bases 8 and 10 are configured. Since the antenna element can be fixed with solder, stable mounting is possible. Of course, these conductors may be a single continuous conductor. The protruding end portion of the conductor does not necessarily have to be linear, and may be bent.

  FIG. 10 shows an example of mounting a magnetic chip antenna on a substrate. In the configuration shown in FIG. 10 (a), the connection conductor 12, the connection conductor 13, the connection conductor 14, and the connection conductor 15 are separated from the substrates 10, 8, and 9 so as to be easily mounted on the substrate. , 8 and 9 are bent toward the mounting surface side, and the tip portion thereof is parallel to the bottom surface which is one end surface of the base, more specifically, located on substantially the same surface. Since the bent portion is separated from the end surface of the base, increase in capacity is suppressed, and chipping of the base and damage to the conductor at the boundary between the conductor and the base are suppressed. On the other hand, the connection conductors 13 and 14 that also serve as protruding end portions are straight when viewed from the side surface of the substrate. The connection conductor 12 and the connection conductor 15 of the conductor 6 can be joined to the conductor portion of the substrate with solder or the like. FIG. 10B shows an example in which the connection conductors 13 and 14 are also bent toward the mounting surface side of the base bodies 8, 9 and 10. Like the connection conductor 12 and the connection conductor 15, the connection conductor is preferably bent at a portion spaced from the base.

  In the case where the conductor is routed using the end portion of the protruding conductor, it is not necessary to form an electrode on the surface of the substrate in any case, so that an increase in capacitance component can be suppressed. In the configuration in which the protruding conductor portion is linear as in the embodiment shown in FIGS. 1 to 8, since the conductor does not have a portion facing each other inside and on the surface, it is particularly effective in reducing the capacitance component. is there.

  Next, another embodiment of the antenna according to the present invention is shown in FIG. The example illustrated in FIG. 12A is an antenna a including the first antenna element 4, the second antenna element 1, the third antenna element 21, and the fourth antenna element 2. In addition, the first antenna element 4 and the fourth antenna element 2 having a base are housed in one case 36. FIG. 12B shows a resin case 36 that houses the first antenna element 4 and the fourth antenna element 2. FIG. 12C shows a plan view of the antenna 41 accommodated in the case 36. The case 36 has a space in the depth direction in which the antenna element can be accommodated, and has slits on both sides so that the connection conductors 12 and 15 can be led out from the inside of the case to the outside of the case. Is provided. A through hole may be provided instead of the slit. The slits or through holes are not necessarily provided on both side surfaces, and may be provided on one side surface. The case 36 is provided with projections 37A on the inner wall of the case for restricting the movement in the direction perpendicular to the longitudinal direction of the antenna element at two points in the longitudinal direction of each antenna element. In the example of FIG. 8, the protrusion 37A is formed in a columnar shape in the depth direction and restrains the antenna element with a line. The cross-sectional shape of the columnar protrusion is not particularly limited, but may be, for example, a triangular shape or a semicircular shape. The protrusion may be constrained by the protrusion as a dot-like protrusion.

  Instead of providing the protrusion, a space substantially the same as the shape of the antenna element having the base may be provided, and the antenna element may be inserted into the space to restrain the movement of the antenna element. It is also possible to restrain the movement of the antenna element using a flat case in which only the protrusions are erected. The depth of the case is not particularly limited, but from the viewpoint of protecting the bases 8 and 10, it is preferable that the case is larger than the thickness of the base and the base does not protrude from the upper surface of the case. The antenna element may be fixed to the substrate or the case with an adhesive. Since the antenna according to the present invention uses a plurality of the antenna elements, the position is likely to be shifted. However, by adopting the configuration using the case, it is possible to maintain the positional relationship between the plurality of antenna elements. In such a case, for example, the conductor member may be fixed by a resin mold, or the conductor member may have an electrode pin structure and protrude from the case. Moreover, you may provide a cover member in the case upper part. The lid member may be bonded and fixed with an adhesive, or the lid member may be hooked on the case. By providing the lid member, the entire antenna element can be protected. Further, in addition to or in place of the above-described protrusion, the movement of the antenna element may be restricted using the lid member.

  The above example is an example in which the movement of the antenna element having the base is constrained using a case, but instead of using the case, the entire antenna element may be molded with resin. For example, the antenna element group shown in FIG. 6 is inserted into a mold and filled with resin to obtain the resin-molded antenna element. In this case, the conductor protruding from the base is extended to the outside of the resin. In addition, the conductor portion and the base body can be assembled to a resin body formed so that the conductor portion and the base body can be attached in advance.

  Next, members constituting the antenna will be described. The material of the conductor part is not particularly limited. For example, in the case where it is constituted by sheet metal or conductive wire, in addition to metals such as Cu, Ag, Ni, Pt, Au, Al, 42 alloy, Kovar, phosphor bronze, Alloys such as brass and a Corson copper alloy can be used. Of these, low-hardness conductor materials such as Cu are suitable for use by bending both ends of the conductor portion, etc., and high-hardness conductor materials such as 42 alloy, Kovar, phosphor bronze, and Corson copper alloy firmly support the substrate. It is suitable for use as a member.

In addition, a conductor material having high hardness, such as 42 alloy, Kovar, phosphor bronze, and Corson copper alloy, is preferably used for the conductor used through the substrate. These materials are particularly suitable for use in a straight line without bending both ends of the conductor. The conductor may be provided with an insulating coating such as polyurethane or enamel. For example, it is possible to secure insulation without providing an insulating coating by using a magnetic substrate having a high volume resistivity, for example, 1 × 10 ⁵ Ω · m or more, but by providing an insulating coating, High insulation is obtained. In this case, the thickness of the insulating coating is preferably 25 μm or less. If this becomes too thick, the gap between the substrate and the conductor becomes large, and the inductance component decreases.

  The shape of the substrate is not particularly limited, but the cross section may be rectangular, square, or circular, and the external shape may be a rectangular parallelepiped, a cylinder, or the like. In order to realize stable mounting, a rectangular parallelepiped shape is preferable. In the case of a rectangular parallelepiped, it is preferable to provide chamfers at corner portions located in a direction perpendicular to the longitudinal direction. By providing chamfering, for example, when a magnetic substrate is used as the substrate, magnetic flux is less likely to leak, and problems such as chipping can be prevented. The method of chamfering may be a method of cutting off the corners in a straight line or a method of providing a radius. The width of the chamfer (the length lost by the chamfered portion on the side surface of the magnetic substrate) is preferably 0.2 mm or more in order to exhibit the substantial effect. On the other hand, when the chamfer is increased, even if it is a rectangular parallelepiped shape, stable mounting becomes difficult. The lengths of the bases of the antenna elements are not necessarily the same, but the manufacturing process can be simplified by making the lengths the same.

  When a magnetic material is used for the substrate, the resonance frequency decreases as the length, width, and height of the substrate increase. For example, in order to be able to be used for quad-band mobile phones in the GSM band (810 to 960 MHz), DCS / PCS, and UMTS band (1710 to 2170 MHz), the size of the base is 5 mm from the antenna mounting space of the casing. The total length in the longitudinal direction is preferably 60 mm or less even when the substrate is divided with a height of 5 mm or less. More preferably, the total length of the substrate is about 30 mm, the width is 2 to 4 mm, and the height is 2 to 4 mm.

  Further, the cross-sectional shape of the conductor penetrating the base body is not particularly limited, but is, for example, circular, square, rectangular or the like. That is, a conductor (wire) or foil (ribbon) can be used. For example, when a magnetic base is used as the base, the cross-sectional shape of the conductor is substantially similar to the cross-sectional shape of the base, and a uniform magnetic path is formed if the thickness of the magnetic body surrounding the conductor coaxially is constant. Therefore, it is preferable. Here, the cross section refers to a cross section perpendicular to the longitudinal direction of the substrate. For example, when a linear conductor penetrates in the longitudinal direction of a rectangular parallelepiped or cylindrical base, the cross section perpendicular to the longitudinal direction is a section in which the base surrounds the outer periphery of the conductor coaxially. Further, when the base body is curved like an arc shape (arch shape) in the longitudinal direction, it is a cross section perpendicular to the circumferential direction of the arc, that is, cut in the radial direction of the arc. Also in this case, it becomes a cross section in which the substrate surrounds the outer periphery of the conductor coaxially.

  The external shape of the conductor portion is not particularly limited, but in the case of a plate shape, a rectangular shape, a square shape, or the like is preferable. For example, when a rectangular plate-shaped conductor portion is used while being erected, the conductor portion may be formed in a substantially L shape by bending the conductor portion in accordance with the board space or the shape of the housing. The shape of a certain conductor portion can be made to match the substrate space or the shape of the housing, and the substantially central portion can be made into a U shape or an arc shape (arch shape).

  Furthermore, when a material form that is easy to process, such as a line shape, a foil shape, or a lattice shape, is used as the conductor portion, it is more flexible than a plate shape and can be adapted to a housing having a complicated shape. The foil shape refers to a metal conductive foil having a thickness of about 10 μm that is mainly formed on a substrate by printing means. The material is Cu or Ag. The lattice shape is a plate shape, but it has many holes of about several tens of μm on the plate-like surface, or a large number of linear conductors with a diameter of about several tens of μm are soldered into a net, etc. It is connected by. The material is Cu or Ag. 5 and FIG. 6, the total length of the conductor portion 100 and the conductor portion 200 is the length of the first antenna element 4 or the length of the first antenna element 4 and the fourth antenna element 2. A plate-like, foil-like, grid-like or linear conductor part longer than the total length can be obtained. Thereby, it is possible to cope with a terrestrial digital television broadcasting band having a frequency lower than that of the GSM band and a wide band. Further, it is preferable that one side of the conductor portion is close to and parallel to the longitudinal direction of the substrate.

  For example, as shown in FIG. 3, when the conductor parts 100 and 200 are formed in a substantially L shape with a plate-like, foil-like or lattice-like conductor, each dimension is 6 to 10 mm on one side and 10 to 30 mm on another side. The longitudinal (height) width is preferably in the range of 0.4 to 10 mm and the thickness is in the range of 0.6 to 1 mm. When formed with a conductive wire, the diameter is preferably about 0.4 to 0.8 mm. The pattern width is preferably about 1 mm. At this time, a connection conductor is connected in the middle of the substantially L-shaped conductor portion, and is formed in a substantially T-shape as an equivalent shape of the antenna to constitute the second antenna element 1 and the third antenna element 21. . Both end portions protruding from the base are each connected to the connection conductor. If one side of the conductor portion facing the ground portion of the conductor portion is close to the ground portion, parasitic capacitance that does not contribute to radiation increases due to capacitive coupling, and the radiation efficiency of the antenna decreases. Therefore, the distance W between one side of the conductor parts 100 and 200 and the ground part end part 40a on the main circuit board is preferably maintained at 6 to 10 mm so as to reduce the influence of capacitive coupling with the transmission / reception circuit and the ground. Moreover, it is preferable that the space | interval of the edge part nearest to the ground part of the conductor parts 100 and 200 and the ground part edge part 40a is close to about 0.2-1 mm. If the end face of the conductor portion is made close to the ground portion in this manner, the frequency change is small even when the interval is increased or decreased, which is suitable for fine adjustment of the resonance frequency.

The configuration in which the linear conductor shown in FIG. 9 passes through the base will be described in further detail. Such a configuration can be manufactured by forming a substrate and then passing through a conductor. For example, Fe ₂ O ₃ , BaO, and CoO, which are the main components of the substrate, have a fixed molar ratio, and 0.6 parts by weight of CuO is added to this main component, and mixed with a wet ball mill using water as a medium. Next, the mixed powder is dried and calcined. The calcined powder was pulverized with a wet ball mill. Water, a binder, a lubricant, and a plasticizer are added to the obtained pulverized powder, and extrusion molding is performed so that the conductor is hollow through the central portion. This is sintered to obtain a rectangular parallelepiped shaped sintered body. A conductor is inserted into the hollow part of the obtained sintered body to complete it.

  As another manufacturing method, the base and the conductor may be integrally formed. For example, when the substrate is made of a magnetic material, it is formed by a method as disclosed in Patent Document 1, that is, a method in which a conductor is placed in a powder of a magnetic material, compression molded, and then sintered. be able to. In addition, as a method of integrally forming the base body and the conductor, a lamination process in which green sheets are laminated can be employed. A mixture of magnetic powder, binder, and plasticizer is formed into a sheet by a doctor blade method or the like to obtain a green sheet, and the green sheet is laminated to obtain a laminate. A magnetic substrate through which a conductor penetrates can be obtained by printing a conductor paste such as Ag in a straight line on a green sheet.

  The cross-sectional shape of the through hole of the substrate is not particularly limited, and may be, for example, a circle, a square, a rectangle, or the like. In order to facilitate the insertion of the conductor and reduce the gap between the base and the conductor, the cross-sectional shape of the through hole may be similar to the cross-sectional shape of the conductor. There may be a gap between the substrate and the conductor, but the presence of the gap leads to a decrease in the inductance component, so it is desirable that the gap be sufficiently small with respect to the thickness of the substrate. The gap is preferably 50 μm or less on one side. Preferably, the cross-sectional shape of the through hole and the cross-sectional shape of the conductor are preferably substantially the same as long as the conductor can be inserted. Such a point does not depend on the formation method of the through hole.

  FIG. 11 shows an example in which the configuration in which the linear conductor shown in FIG. 9 penetrates the base is realized by forming the magnetic base and the conductor separately when the base is made of a magnetic base. The example shown in FIG. 11 is an embodiment in which a rectangular parallelepiped magnetic base is constituted by a plurality of members, and a through hole is formed by the plurality of members. In FIG. 11A, the magnetic base is composed of a magnetic member 26 provided with a groove for inserting a conductor, a conductor 5, and a magnetic member 25 for bonding to the magnetic member 26 across the groove. This is a state before the antenna element is configured. FIG. 11B is a diagram showing a state in which the conductor 5 is inserted into the groove of the magnetic member 26 and the magnetic member 25 is bonded and fixed to form an antenna element. After bonding the magnetic member 26 and the magnetic member 25, a conductor may be inserted into the formed through hole. In either case, the through hole is formed by bonding the magnetic member 26 and the magnetic member 25 together. The groove can be formed with high accuracy by using, for example, dicing. In the example of FIG. 11, since the base is assembled by simple groove processing and member bonding, the through hole can be formed extremely easily. The cross-sectional shape of the groove is set according to the cross-sectional shape of the conductor so that the conductor can be inserted. That is, the depth of the groove is set so that the conductor does not protrude from the upper surface of the groove. In the example of FIG. 11, a groove is provided on one of the magnetic members, but a through hole may be formed by providing a groove on both of the magnetic members and bonding the grooves facing each other. In this case, the inserted conductor also functions to position both magnetic members.

  The following configuration may be used as another embodiment in which the magnetic base is constituted by a plurality of members and the through hole is formed by the plurality of members. In other words, the magnetic base has a rectangular parallelepiped shape, and is configured by sandwiching two thin plate-like magnetic members between other magnetic members. Both of the magnetic members are cuboids. A through-hole is formed by the two thin plate-like magnetic members having a predetermined interval, and the shape and size of the through-hole are determined by the interval and the thickness of the two magnetic members. Such a configuration is suitable for simple manufacture of a chip antenna because a magnetic member can be manufactured by simple processing without requiring groove processing.

  The magnetic base and the conductor, and the magnetic member and the magnetic member can be fixed using a clamp or the like, but are preferably fixed in order to fix them securely. For example, if the magnetic base and the conductor are fixed, an adhesive may be applied and fixed to the gap between the magnetic base and the conductor. Adhesion between magnetic members is applied and bonded to the bonding surface. Since the magnetic gap increases as the adhesive becomes thicker, the thickness of the adhesive is preferably 50 μm or less. More preferably, it is 10 μm or less. In order to suppress the formation of a magnetic gap, an adhesive may be applied and fixed to a portion other than the bonding surface. For example, an adhesive is applied on the side surface so as to straddle the bonded portion of the magnetic member.

  As the adhesive, a thermosetting resin, an ultraviolet curable resin, an inorganic adhesive, or the like can be used. The resin may contain a magnetic filler such as an oxide magnetic substance. In consideration of the case where the chip antenna is solder-fixed, it is preferable to use an adhesive having high heat resistance. In particular, when applying reflow in which the entire chip antenna is heated, it is preferable to have heat resistance of about 300 ° C. When the gap between the magnetic base and the conductor is small and the movement of the conductor provided in the through hole of the magnetic base is sufficiently restrained by the magnetic base, it is necessary to provide a fixing means between the magnetic base and the conductor. There is no.

  As the magnetic substrate, spinel type ferrite represented by Ni-Zn based ferrite and Li based ferrite, Z-type and Y-type hexagonal ferrite called planar, and composite materials containing these ferrite materials may be used. However, a sintered body of ferrite is preferable, and it is particularly preferable to use Y-type ferrite. A ferrite sintered body has a high volume resistivity and is advantageous for insulation from a conductor. If a ferrite sintered body having a high volume resistivity is used, an insulating coating is not necessary between the conductor and the conductor.

In general, when ferrite is used for an antenna, the loss of the antenna is proportional to the magnetic loss tan δ × the magnetic permeability μ, but the magnetic loss tan δ is preferably as small as possible, and the magnetic permeability μ is preferably about 2 to 6. Among them, the Y-type ferrite of Table 1 to be described later among Y-type ferrites is that the magnetic permeability μ is maintained at about 2 to 6 up to a high frequency of 3 GHz or higher, and the magnetic loss tanδ is small in the frequency band up to 3 GHz. Suitable for quad-band antenna elements including GSM band (810-960 MHz) to DCS / PCS and UMTS bands (1710-2170 MHz) in mobile phones. In such a case, a sintered body of Y-type ferrite may be used as the magnetic substrate. The sintered body of Y-type ferrite is not limited to a Y-type ferrite single phase, and may contain other phases such as Z-type and W-type. The sintered body does not need to be processed if it has sufficient dimensional accuracy as a magnetic member after sintering, but it is desirable that the bonded surface be polished to ensure flatness.

  If the initial permeability of the Y-type ferrite at 1 GHz is 2 or more and the loss coefficient is 0.1 or less, more preferably 0.05 or less, it is advantageous for obtaining a broadband and high gain antenna element. If the initial permeability is too low, it is difficult to achieve a wide band. Further, when the loss coefficient, that is, the magnetic loss increases, the gain of the chip antenna decreases. In order to obtain an average gain of −5 dBi or more as an antenna element, the loss coefficient is preferably 0.05 or less. By reducing the loss factor to 0.03 or less, an antenna element having a particularly high gain can be obtained.

  As described above, since the structure according to the magnetic substrate of the present invention hardly forms a capacitance component, an increase in the internal loss of the antenna element is suppressed even if the relative permittivity is somewhat increased. From the viewpoint of loss, it is preferable that the relative dielectric constant is low, but in the structure according to the magnetic substrate of the present invention, the internal loss of the antenna is hardly affected by the relative dielectric constant, that is, it is quite insensitive to the relative dielectric constant. . Therefore, a dielectric material having a high dielectric constant can also be used for the substrate in order to suppress variations in resonance frequency. In this case, the relative dielectric constant is preferably 4 or more, more preferably 6 or more.

  Next, a method for connecting and fixing the antenna elements will be described with reference to FIG. When the first antenna element 4 of FIG. 2 is used, the connection method is such that one end on the non-feeding side of the conductor protruding from the magnetic base 10 is connected to the conductor portion 200 via the connecting conductor 12 and is on the feeding side. The other end is connected to the conductor part 100 via the connection conductor 15, and the power supply line 11 connected to the conductor part 100 is connected to the power supply electrode 28, and is connected to the transmission / reception circuit 29 (not shown) via the power supply electrode 28. The antenna device is configured by being connected. These connections are made by joining with solder or the like.

  A specific fixing method of the antenna element is performed by connecting the respective conductors with solder or the like as described above and fixing the respective conductors and the substrate to the substrate. In the case where the conductor part 100 and the conductor part 200 are plate-like conductor parts, a pin-like protrusion is formed at the edge portion where the conductor part is in contact with the substrate surface, and the fixing electrode is provided on the substrate 16. 27 is fixed by soldering so as to be perpendicular to the substrate. In the case where the conductor portion 100 and the conductor portion 200 are conductor portions formed of linear conductive wires, a pin-like protruding portion is connected to the conductive wire, and the protruding portion is soldered to a fixing electrode provided on the substrate 16. By fixing by joining, it can stand upright so that it may become perpendicular | vertical with respect to a board | substrate. The first antenna element 4 composed of the base 10 and the conductor 7 is connected by solder bonding at both ends to the conductor portion 200 via the connection conductor 12 and to the conductor portion 100 via the connection conductor 15. Then, the bottom surface is fixed by bonding to the substrate with an adhesive or the like.

  The other end and one end of the conductor 7 of the first antenna element 4 connected to the conductor portion 100 and the conductor portion 200 are not necessarily fixed to the electrode of the substrate, but for stable mounting and adjustment of the resonance frequency. It is preferable that the side connected to the conductor portion is also temporarily fixed to the electrode of the substrate and then connected to the conductor portion. For example, the mode shown in FIGS. 1 to 8 may be the same as the mode shown in FIG. Further, since the first antenna element 4 is arranged so that the longitudinal direction of the conductor 7, that is, the longitudinal direction of the magnetic base 10, is parallel to the substrate plane, low-profile and stable mounting is possible. This also applies to antenna devices of other embodiments described later.

  In the case where the conductor part 100 and the conductor part 200 are conductive patterns of a metal conductive film formed by printing or the like on another substrate that is a conductive foil or a sub-substrate fixed along the inner side surface of the housing with an adhesive or the like, connection The conductors 12 and 15 can be soldered to the conductor part 100 and the conductor part 200, respectively. The conductor 7 projecting from the magnetic substrate and the conductor part 100 and the conductor part 200 may be directly connected by connecting conductors 12 and 15, respectively. Further, the antenna device of the present invention can be used in any form of a reception antenna, a transmission antenna, and a transmission / reception antenna. Further, as shown in FIG. 14, the antenna a may be mounted on the sub-board 16a and separated from the main circuit. In this case, the distance between the ground portion 40 on the main circuit board and the antenna a is increased, so that capacitive coupling with the ground portion is reduced and gain and bandwidth are improved. In addition, noise radiated from the main circuit is reduced to the antenna side. This makes it difficult to receive the signal and improves the reception sensitivity of the wireless device.

Next, a method for adjusting the resonance frequency of the antenna device will be described. To determine the band used by the antenna of the present invention, it is necessary to first determine the center frequency f _0. For this purpose, it is determined from the specifications of the conductor part. First, the material is selected, and the length, width, thickness or thickness of the conductor part is selected according to the resonance frequency of the frequency band to be used in consideration of the space constraints in the housing. Approximately decide. When the base is composed of a magnetic base, a magnetic base selected in advance from a preferable magnetic permeability μ and dimensions for the target frequency band is attached, and finally the conductor is matched with the center frequency f ₀ of the target frequency band. Adjust the length of the part.

Specifically, in adjusting the magnetic substrate, the magnetic permeability μ is determined by selecting the material, and then the center frequency f ₀ as the antenna is determined by attaching and connecting the conductor portion. Since the resonance frequency decreases as the thickness increases, the width and height of the magnetic substrate are first determined, and the approximate length of the entire magnetic substrate is determined slightly larger. Further, when the width of the housing cannot be secured widely due to the shape restriction, the magnetic base is divided and the total length is determined by the total length. Next, the length of the conductor is determined. First, the low frequency band is adjusted, but the length of the conductor connected to the power feeding side of the magnetic substrate is adjusted. At this time, in order to secure a wide band at a low frequency band, the lengths of the plurality of conductor portions extending from the connection point of the connection conductor and the conductor portion as a base point are adjusted slightly to have a plurality of resonance points. . Next, the higher frequency band is adjusted, but the length of the conductor portion connected to the non-feeding side of the magnetic substrate is adjusted. At this time, in order to secure a wide band in a high frequency band, the lengths of the plurality of conductor portions extending from the connection point of the connection conductor and the conductor portion are slightly different and adjusted so as to have a plurality of resonance points. . Finally, the length of each conductor part and the distance between each conductor part and the ground are finely adjusted so as to obtain a balanced gain and VSWR in all bands.

  Next, another method for adjusting the resonance frequency of the antenna device will be described with reference to FIGS. 14 and 15, since the antenna device is mounted on the sub-board 16a, the ground electrode 30 is provided. Of course, when the antenna device is mounted on the substrate 16 on which main circuit components other than the antenna device are also mounted, the ground may be grounded at the ground portion 40 of the substrate 16. In the antenna device shown in FIG. 14, the base body 10 is disposed between the conductor portion 100 and the conductor portion 200 and the ground electrode 30, and the plane portions of the conductor portion 100 and the conductor portion 200 are perpendicular to the surface of the ground electrode 30. It arrange | positions so that it may become. This arrangement can secure a distance and have a structure that greatly suppresses the capacitance component. However, when the capacitance component (between the fixed electrode 27 and the ground electrode 30) is insufficient for the desired antenna characteristics, The antenna characteristic is adjusted by adding the capacitive component 27a by the method shown in FIG. As a specific example of adjusting the resonance frequency of the antenna, a matching circuit 31 is provided between the feeding electrode 28 and the transmission / reception circuit 29, which is switched by connecting at least one capacitor and a switch between the fixing electrode 27 and the ground electrode 30. For example, a variable capacitance diode (varactor diode) may be connected and adjusted to a predetermined resonance frequency while changing the capacitance according to the applied voltage. According to these methods, the capacitance component can be easily adjusted as compared with the method of adjusting the capacitance component of the chip antenna itself.

  By configuring an antenna device using the antenna according to the present invention, the operating frequency band of the antenna device can be widened. The frequency bands used by mobile phones are the GSM band (810 to 960 MHz), DCS / PCS and UMTS bands (1710 to 2170 MHz), but each frequency band is as wide as 150 MHz and 460 MHz. The spacing between the / PCS and UMTS bands is about 1000 MHz apart.

  In general, when the frequency bands used are separated by several hundred MHz or more, it is necessary to use a plurality of antenna devices. In that case, the mounting area and the mounting space increase. According to the present invention, since the connection conductor is connected in the middle of the conductor portion, the length corresponding to approximately λ / 4 of the use frequency of the conductor portion extending in two directions with the connection point as a base point is slightly different. For example, as shown in FIG. 21, it can resonate with a plurality of frequencies f1 and f2. As a result, each frequency band can be expanded. Using this effect, the base and the conductor portion on the tip side of the base can resonate in the GSM band. Further, the substrate and the conductor on the power supply side of the substrate can resonate in the DCS / PCS and UMTS bands. At this time, since multiple resonances also occur between the portion where the substrate and the conductor on the power supply side of the substrate face each other, the VSWR is low and high over the wide DCS / PCS and UMTS bands, particularly in the high frequency band. Gain can be obtained. As a result, a single antenna device can be used even when a frequency band operating in a wide range is separated from each other by several hundred MHz or more in a single mobile phone. If the antenna device having the above-described bandwidth is used, it is possible to cover the frequency bands of the GSM band, DCS / PCS, and UMTS band.

  The necessary average gain of the antenna device is preferably −5 dBi or more, but according to the present invention, a gain of −3 dBi or more can be ensured even in each of the separated frequency bands. The required VSWR is preferably 4 or less, but according to the present invention, VSWR of 3.5 or less can be ensured in each of the separated frequency bands.

  The antenna according to the present invention is a combination of a dielectric chip antenna or a magnetic chip antenna and a plurality of conductors, and can cover a wide frequency band. As shown in FIG. 16, a matching circuit 31 for adjusting the resonance frequency of the antenna device may be provided between the antenna element and the transmission / reception circuit. For example, the matching circuit 31 shown in FIG. 16 is used. In the example of FIG. 16, a matching circuit is configured by the capacitor C1 and the inductor L1. The conductor of the antenna element is connected to the other end of the capacitor C1 and the other end of the inductor L1, one end of the inductor L1 is grounded, and the transmission / reception circuit 29 is connected to one end of the capacitor C1. Since the antenna according to the present invention can cover a wide frequency band by itself, such a simple matching circuit can be provided, and space can be saved.

  The antenna and the antenna device configured using the antenna are used in communication equipment. For example, the antenna and the antenna device can be used for communication devices such as a mobile phone, a wireless LAN, a personal computer, and a digital terrestrial television broadcasting-related device, and contribute to a broadband response in communication using these devices. In particular, by using an antenna according to the present invention or an antenna device using the antenna, it is possible to suppress an increase in mounting area and mounting space over a wide band. Can be used.

  FIG. 17 shows an example used for a mobile phone as a communication device. The position of the built-in antenna a is the upper part of the figure. The mobile phone 33 has an antenna a attached to a substrate. One side of the second antenna element 1 composed of the first antenna element 4 and the conductor part 100 constituting the antenna a and one side of the third antenna element 21 composed of the conductor part 200 are arranged in parallel in the longitudinal direction. . Further, the main parts of the conductor part 100 and the conductor part 200 are arranged along the inner side of the front end of the casing of the mobile phone 33 in order to mount with a small space loss at the front end part of the mobile phone 33. In this example, as viewed from the surface of the substrate 16, the concave-shaped sub-substrate 16 a is formed on the concave portion of the substrate 10 so that a space 50 is formed between the base 10 and the ground portion 40 of the substrate 16. It is in contact with one side.

  When the antenna a is provided directly on the substrate 16 without being provided on the sub-substrate 16a, a space (opening) 50 may be provided below the base 10 in a square shape. As a result of the presence of this space 50, the dielectric constant is lowered, the Q value is lowered, the capacitance therebetween is reduced, and the reverse current (which occurs in the vicinity of the ground portion 40a) that cancels the resonance current generated in the antenna a is reduced. Effects such as a wide band and high gain can be obtained. Further, by providing a conductor 60 made of Cu, Ag, or the like facing the feeder line 11 between the back surface of the substrate 16 or between the layers of the substrate 16, impedance matching is improved and the bandwidth is widened. The antenna performance can be improved by gain.

  As described above, it is needless to say that the technical contents related to the communication device according to the present invention, such as the arrangement of the antenna described above, may be applied to an antenna device of a mobile communication device in which an antenna is mounted on a so-called sub-board. Yes.

  Furthermore, FIG. 22 shows a perspective view of an antenna according to an embodiment of the present invention. The antenna of this example is as shown in FIG. 23 in plan view. This antenna is provided on an antenna substrate (sub-substrate) 16a which is provided on substantially the same plane as the main substrate 16m, forms a U-shape (square bracket shape), and forms a space 50 with the main substrate 16m. It is done. It is assumed that a ground pattern is formed on the main substrate 16m side up to the boundary with the sub substrate 16a. Note that the gap space 50 is not always necessary, but when the Q value of the antenna is high, the Q value can be lowered by forming this.

In FIG. 22, the feeder 11 is extended from the main board 16m to the sub board 16a. The first conductor 150 passes through the antenna base 10 (similar to that shown in FIG. 9), and both ends thereof are exposed to the outside of the antenna base 10. One end of the first conductor 150 is connected to the feeder line 11, and the other end is electrically connected to the plate-like second conductor 100.
As already described, the antenna base 10 is a magnetic chip or a dielectric chip, and the portion of the first conductor 150 inside the antenna base 10 functions as the first antenna element 4 together with the antenna base 10.

  In the example shown in FIG. 22, the conductor portion 100 that is the second conductor is a plate-like conductor standing substantially perpendicular to the ground pattern surface of the substrate 16 (arranged parallel to the surface of the substrate). . This is to prevent an increase in capacitance component due to an increase in the area facing the ground pattern. The conductor portion 100 is bent along the circumference of the sub-board 16a so as to form an obtuse angle at the bent portion. In addition, although bent so that it may become a polygon in planar view here, it is not restricted to this, The conductor part 100 may be curved by the arc.

   Further, as shown in FIG. 23, the end portion of the first conductor 150 is a point E1 (LT-E1) located at a position separated from the longitudinal ends LT and RT of the conductor portion 100 by predetermined lengths L1 and L2, respectively. The conductor length L1 and the conductor length L2 between the RT-E1 are electrically connected. The conductor portion 100 receives power from the power supply line 11 via the first conductor 150 and functions as the second antenna element 1.

Thus, by arranging the conductor portion 100 so as to surround the first antenna element 4 along the outer periphery of the sub-board 16a, the second antenna element 1 has a relatively low frequency band, for example, a GSM band. The terrestrial digital TV broadcasting band with a lower frequency and wider band can be supported.
In the above description, the conductor portion 100 is a plate-like conductor. However, the present embodiment is not limited to this, and is formed in the plane of the substrate 16a with an electric wire or a metal foil as illustrated in FIG. May be. Further, the conductor portion 100 may be a conductor line pattern formed on the substrate 16. In any case, the first conductor 150 is electrically connected to one point E1 located at predetermined lengths L1 and L2 from both ends LT and RT, respectively.

  For example, in a terrestrial digital TV broadcasting band with a wide band, the lengths of L1 and L2 are slightly different so that two resonance frequencies corresponding to different conductor lengths L1 and L2 are obtained, thereby gaining over the entire broadcasting band. It can be covered with less decline.

  Furthermore, although the conductor part 100 is supposed to receive power supply through the first conductor 150 here, it is not limited thereto, and may be supplied with power from the power supply line 11 through a connection conductor different from the first conductor 150. . In this case, the connecting conductor is electrically connected to one point located at positions separated from both end portions LT and RT of the conductor portion 100 by the conductor lengths L1 and L2, respectively. Further, when power is supplied to the conductor part 100 using the connection conductor in this way, one end of the first conductor 150 may be connected to the connection conductor to receive power supply, or connected to the conductor part 100 to supply power. You may receive it.

  FIG. 25 shows another example of the antenna according to the embodiment of the present invention. In the antenna of the example of FIG. 25, the conductor part 100 as the second conductor and the conductor part 200 as the third conductor are disposed so as to surround the first antenna element 4. The conductor portion 100 and the conductor portion 200 may also be plate-like conductors standing substantially perpendicular to the ground pattern surface of the substrate 16m (arranged parallel to the surface of the substrate).

   Here, one end of the connection conductor 150b is connected to one point E2 located at predetermined lengths L3 and L4 from both end portions LT2 and RT2 of the conductor portion 200, respectively. The other end side of the connection conductor 150b is connected to the power supply line 11, and the conductor portion 200 receives power from the power supply line 11 through the connection conductor 150b.

  Further, the conductor portion extending from the feeding point E1 by the lengths L1 and L2 resonates in the GSM band, and the conductor portion extending from the feeding point E2 by the length L3 is caused to resonate by the DCS / PCS band. The conductor portion can correspond to the quad band by resonating with the UMTS band. In addition, when resonating at one specific frequency or when the GSM band is unnecessary, the conductor portion 100 may be provided by extending linearly from one end of the first conductor 150a with L1 = 0 or L2 = 0. In this case, the conductor part 100 is provided at a position corresponding to the conductor part 100 'indicated by the broken line in FIG. When the DCS / PCS band is unnecessary, L3 = 0 can be set. When the UMTS band is not required, L4 = 0 can be set. In either case of L3 = 0 or L4 = 0, the conductor part 200 may be provided in the same manner as shown in FIG.

  One end of the first conductor 150a is connected to the conductor portion 200. The first conductor 150 a penetrates the antenna base 10, and both ends are exposed to the outside of the antenna base 10. The first conductor 150a is electrically connected to a point E1 that is located at a predetermined distance L1, L2 from both ends LT, RT of the conductor portion 100, respectively.

  Also in the example shown in FIG. 25, the conductor part 100 and the conductor part 200 may not be a plate-like conductor but may be formed of an electric wire, a metal foil, or the like. Furthermore, a conductor line pattern formed on the substrate 16 may be used. Further, the first conductor 150a may be connected to the connection conductor 150b instead of the conductor portion 200. In this case, the first conductor 150a receives power through the connection conductor 150b.

  In the antenna of the present embodiment, unlike the dielectric chip antenna or magnetic chip antenna having a helical electrode, the antenna base 10 is not wound with a conductor, so that the stray capacity between the lines ), Which is advantageous in expanding the band. Further, the antenna base 10 and one side of the conductor part 100 and the conductor part 200 are separated from each other, and the ends of the conductor part 100 and the conductor part 200 are also separated from the ground pattern of the main board 16m. Therefore, the radiation resistance between the ground of the main board 16m and the conductor part 100 or the conductor part 200 is increased, and the radiation efficiency is improved.

Further, in the present embodiment, since power is supplied to the conductor portion 100 and the conductor portion 200 at positions separated from the respective ends by a predetermined conductor length, by setting L1 ≠ L2, the corresponding frequency λ It can also be set to / 4 so that each conductor can resonate at two different frequencies. As a result, the voltage standing wave ratio (VSWR) is low, and the frequency band with improved gain can be widened. That is, good antenna characteristics can be obtained in a wide band.
The shapes of the conductor part 100 and the conductor part 200 may be substantially U-shaped, substantially inverted V-shaped, substantially Y-shaped, or the like according to the shape of the sub-board 16a or the case in which the sub-board 16a is built.

  A signal processing circuit and a transmission / reception circuit are connected to the main board 16m. For example, the signal processing circuit receives data to be transmitted, encodes the data, and outputs the data to the transmission / reception circuit. In the transmission / reception circuit, the encoded data is modulated and output as a high-frequency signal through the feeder line 11, and from the antennas (first antenna element 4, second antenna element 1 and the like) mounted on the sub-board 16a. Let it radiate.

  The transmission / reception circuit receives a signal arriving at the antenna side via the feeder line 11, demodulates the signal, and outputs the demodulated signal to the signal processing circuit. The signal processing circuit decodes encoded data included in the demodulated signal and outputs data obtained by the decoding.

  In the antenna of the present embodiment, as shown in FIG. 26, the first conductor 150 may penetrate the plurality of antenna bases 10a and 10b. In this case, the antenna bases 10a and 10b are arranged apart from each other. In this way, the portion of the first conductor 150 that penetrates the antenna base 10a functions as an antenna element together with the antenna base 10a. Similarly, the portion of the first conductor 150 that penetrates the antenna base 10b and the antenna base 10b Functions as another antenna element. In the example of FIG. 26, an example in which the conductor portion 100 is provided is shown. However, the present invention is not limited to this, and the first conductor 150 includes a plurality of antennas even when both the conductor portion 100 and the conductor portion 200 are provided. You may make it penetrate the base | substrate 10. FIG. The materials of the plurality of antenna bases 10 may be different from each other.

  In the example shown in FIG. 26, the plurality of base bodies 10 are arranged on a straight line parallel to the first conductor 150. However, as shown in the plan view of FIG. 27, the first conductor 150 is meandered in a crank shape. The arrangement of the antenna bases 10 may be changed according to the mounting space, for example, in parallel. Further, by dividing the antenna base 10 (10a, 10b, etc.) into a plurality of parts, the length of each antenna base 10 can be shortened, the structural strength is improved, and the antenna reliability is improved.

  Here, the shape of the meandering path of the first conductor 150 may be a meander shape or an L shape. The first conductor 150 may be disposed in an arc shape.

  In the case where a dielectric is used as the plurality of antenna bases 10 of the first antenna element 4, since the dielectric surrounds the first conductor 150 penetrating the dielectric, the effective dielectric constant of the antenna base 10 is obtained. Becomes higher. Further, when a magnetic material is used as the antenna substrate 10, the magnetic material surrounds the first conductor 150 penetrating the magnetic material, so that the magnetic field is formed coaxially with the first conductor 150 as the center. Increases the magnetic permeability. Thereby, even if the antenna substrate 10 is a dielectric or a magnetic material, a wavelength shortening effect is produced, and the entire antenna can be reduced in size.

  In the above description, both ends of the first conductor 150 are connected to the feeder line 11 or other conductors. However, as described above, from both ends of the first conductor 150 to the feeder line 11 or other conductors. May be connected using other connection conductors. In this case, the entire length of the first conductor 150 may be linear.

  In the above description, the first conductor 150a is disposed so as to be surrounded by the second conductor portion and the third conductor portion. However, the present invention is not limited to this example. For example, as shown in FIG. 28, conductor portions 100a and 100b having conductor lengths L1 and L2 are connected to both ends of the first conductor 150a, and a feeding point is provided on one end side of the first conductor 150a. The power supply from the main board 16m may be received at 150b. Here, the conductor portions 100a and 100b are bent in an L shape along the shape of the sub-board 16a. Further, in the example of FIG. 28, the conductor portion 200 of the connecting conductor 150b connected between the main board 16m and the feeding point of the first conductor 150a and extending substantially parallel to the first conductor 150a by a predetermined length L3. Is provided. Thereby, the conductor part 100a, the first conductor 150a, and the conductor part 100b are arranged in a shape surrounding the conductor part 200.

  In this configuration, the conductor portion is set so that the distance d1 from the conductor portion 200 to the first conductor 150a (antenna base 10) is smaller than the distance d2 from the ground plane of the main board 16m to the conductor portion 200. 200 is disposed. As a result, the parasitic capacitance between the antenna base 10 and the like can be increased while the ground capacitance is reduced, and the bandwidth can be increased.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

First, in manufacturing the magnetic substrate of the present invention shown in FIG. 9, first, Fe ₂ O ₃ , BaO (using BaCO ₃ ) and CoO (using Co ₃ O ₄ ) as main components are 60 mol%, 20 mol%, and 20 mol. %, The CuO shown in Table 1 was added to 100 parts by weight of the main component, and mixed with water as a medium in a wet ball mill for 16 hours (No. 1 to No. 7).

  Next, this mixed powder was dried and calcined at 1000 ° C. for 2 hours in the air. The calcined powder was pulverized with a wet ball mill for 18 hours. 1% of binder (PVA) was added to the obtained pulverized powder and granulated. After granulation, it was compression molded into a ring shape and a rectangular parallelepiped shape, and then sintered in an oxygen atmosphere at 1200 ° C. for 3 hours. The resulting sintered density of the ring-shaped sintered body having an outer diameter of 7.0 mm, an inner diameter of 3.5 mm, and a height of 3.0 mm, an initial permeability μ and a loss factor tan δ at 25 ° C. were measured.

  Table 1 shows the evaluation results of the sintered body density, the initial permeability μ at a frequency of 1 GHz, the loss factor tan δ, and the loss factor tan δ at a frequency of 1.8 GHz. The density was measured by an underwater substitution method, and the initial permeability μ and the loss coefficient tan δ were measured using an impedance gain phase analyzer (4291B manufactured by Yokogawa Hewlett Packard). For some samples, the dielectric constant was also measured using the impedance gain phase analyzer. The dielectric constant is a relative dielectric constant.

As a result of X-ray diffraction, in the materials No. 1 to No. 7, the constituent phase having the highest main peak intensity was Y-type ferrite, and Y-type ferrite was the main phase. As shown in Table 1, a Y-type ferrite to which 0.1 to 1.5 wt% of CuO is added has an initial permeability of 2 or more and a loss factor of 0.05 or less at 1 GHz. Further, the volume resistivity is 1 × 10 ⁵ Ω · m or more, and the sintered body density is 4.8 × 10 ³ kg / m ³ or more, both of which are good values. Among these, in particular, CuO added at 0.6 to 1.0 has a high initial permeability of 2.7 or more, a low loss coefficient of 0.03 or less, and a high of 4.84 × 10 ³ kg / m ³ or more. Density is obtained. It was also found that the sample No. 4 is suitable as a condition that the initial permeability is 2.7 or more and the loss coefficient is low at both frequencies of 1 GHz and 1.8 GHz. Therefore, a material based on a sample No. 4 having a high density and high initial permeability and a low loss coefficient at both frequencies of 1 GHz and 1.8 GHz was selected as the magnetic substrate of the present invention. The relative dielectric constant of the sample No. 4 was measured and found to be 14. The material of the substrate shown in the conventional example of FIG. 18 is a glass / epoxy resin and has the performance of a relative dielectric constant of 4.6 and a dielectric loss of 0.001, but the relative dielectric constant of No4 is 14 as compared with this. Big enough.

  Using the sintered body of the material No. 4 described above, an antenna element made of a magnetic substrate was produced as follows in the manner shown in FIG. From the sintered body, 30 × 3 × 1.25 mm and 30 × 3 × 1.75 mm rectangular magnetic members were obtained by machining. In the 30 × 3 × 1.75 mm magnetic member, a groove having a width of 0.5 mm and a depth of 0.5 mm was formed in the longitudinal direction in the center in the width direction of the 30 × 3 mm surface. After inserting a copper wire of 0.5 mm square and 40 mm length as a conductor into the groove, a magnetic member of 30 × 3 × 1.25 mm was bonded with an epoxy adhesive (Alemco Bond 570 manufactured by Alemco). The adhesive was applied to the bonding surface of the magnetic member.

Through-holes of 0.5 mm in length and 0.5 mm in width are formed by the construction of the magnetic member, and the substrate obtained by bonding is 30 × 3 × 3 mm. Thus, an antenna element was obtained in which a copper wire as a conductor protruded from the end face of the magnetic substrate. In mass production of antenna elements using an actual magnetic substrate, a magnetic powder made of Fe ₂ O ₃ , BaO, CoO or the like is granulated by the above method in the same manner as the production of the magnetic substrate, and the granulated material is hollow together with a conductor. After extrusion molding into a rectangular parallelepiped shape, sintering, the conductor can be inserted into the hollow portion and manufactured.

  The method for manufacturing the magnetic member is kneaded and fired using only the magnetic powder. However, a composite member obtained by mixing and solidifying the magnetic powder and the resin material can be used as the composite magnetic member. . In this case, the strength can be improved by hardening with a resin compared to the case of using only magnetic powder. Further, since the mixing ratio of the magnetic powder and the resin material can be changed, it is easy to change the density of the magnetic member.

  Next, in manufacturing the conductor part of the present invention shown in FIGS. 1 to 8, 12, and 17, a plate-like sheet metal was used, but Cu was selected as the material from the viewpoint of workability. The shape was substantially L-shaped in conformity with the inner surface shape of the housing shown in FIG. 17, and both end portions were extended along the inner edge of the housing. At this time, the conductor portion is formed in a substantially T shape as an equivalent shape of the antenna by connecting both ends of the conductor of the antenna element composed of the base and the conductor in the middle of the conductor portion via the connecting conductor.

  Further, for example, the specific dimensions of the antenna a as shown in FIG. 3 are as follows: the conductor part 100 of the second antenna element 1 on the power feeding side of the base 10 is 28 mm in the horizontal direction, 7 mm in the vertical direction, and 2 mm in the corner part. The total length is 37 mm, the height is 4 mm, and the thickness is 1 mm. The conductor part 200 of the third antenna element 21 on the non-feeding side of the base 10 has a horizontal direction of 8 mm, a vertical direction of 7 mm, a corner part of 2 mm, and a total length of 17 mm. The total length of the two conductor portions is 55 mm, the height is 4 mm, and the thickness is 1 mm. The distance between the lateral ends of the two conductor portions is 3 mm. The base 10 has a length of 30 mm and a cross section of 3 mm square. Further, in order to reduce the influence of capacitive coupling with the transmission / reception circuit and the ground, the distance W between the one side of the conductor parts 100 and 200 parallel to the ground part end part 40a and the ground end part 40a is set to 8 mm. The distance W1 between the longitudinal tip and the ground end 40a was 1 mm.

  The relationship between the length of each antenna element and each frequency band will be described with reference to FIG. As for the DCS / PCS band, the total length of the conductor portion 200 on the power supply side of the base 10 is 37 mm. This length corresponds to approximately λ / 4 of 1800 MHz, and can resonate with the DCS / PCS band. In particular, the UMTS band has a slightly higher frequency than the DCS / PCS band. However, since one side of the conductor part 200 and the base 10 are close to each other and parallel to each other, capacitive coupling occurs between the opposing surfaces, causing multiple resonance. The band is widened and can be easily resonated in the UMTS band. For the GSM band, the total length of the conductor portion 100 on the non-feeding side of the base 10 and the connecting conductor 12 is 20 mm, and the connecting conductor 15 and the feeding line 11 on the feeding side of the base are combined. When the magnetic material having a length of 15 mm, a length of the base 10 of 30 mm, and an initial permeability μ of 3 is used for the base, an effective length of 20 mm due to a wavelength shortening effect (actual length of the base 10 30 mm × √μ ) Is 85 mm. This length corresponds to approximately λ / 4 of the 850 MHz band, and can resonate with the GSM band. By adopting such a configuration, as in the conventional example shown in FIG. 18, an antenna composed of only a conductor portion or only a base (for example, an antenna in which an inverted F-type antenna conductor is printed on the surface of a base made of glass epoxy) A high gain can be obtained by lowering the VSWR at the lower frequency in the frequency bands of the GSM band, DCS / PCS, and UMTS band, which cannot be sufficiently obtained by the element 42). As a result, the practical band of each band can be expanded. Here, when the conductor part 200 is removed, a long space can be secured so as to surround the base body 10 with the conductor part 100 using an empty space. Therefore, it is possible to cope with a terrestrial digital television broadcast band having a frequency lower than that of the GSM band and a wide band.

  Next, the performance of the antenna device will be described. As an apparatus for an actual measurement example of antenna performance, the antenna a was mounted on a substrate, and one end of the antenna element was connected to a power feeding electrode to constitute an antenna apparatus A mounted on a mobile phone. An embodiment in which the antenna device A is mounted is shown in FIG. In other words, the structure shown in FIG. 2 is realized by forming a feeding electrode, a feeding line, and each antenna element on a substrate. In this example, the above-described dimensions of the antenna were used. A measurement antenna (installed on the right side of the antenna device in FIG. 17 (not shown)) is provided at a position 3 m away from the antenna device A, and the measurement antenna is connected to a network analyzer via a 50Ω coaxial cable. The antenna characteristics were measured. Specifically, the horizontal direction (short-side direction of the substrate) of the substrate shown in FIG. 17 is X, the direction perpendicular thereto (the longitudinal direction of the substrate) is Y, and the direction perpendicular to them, that is, the direction perpendicular to the surface of the substrate is Z. The average gain on the ZX plane and the VSWR were measured. The measured frequency bands are 700-1100 MHz and 1600-2200 MHz. This frequency band includes the GSM band (810-960 MHz) and the DCS / PCS and UMTS bands (1710-2170 MHz), respectively.

  FIG. 19 shows the relationship between the average gain and the frequency when the antenna apparatus A shown in FIG. 17 which is an embodiment of the present invention and the antenna of the prior art 42 shown in FIG. 18 are used. FIG. 20 shows measurement data of the relationship between the VSWR and the frequency by the antenna of the embodiment and the conventional example. The average gain shown in FIG. 19 is low on the low frequency side and high frequency side of each band in the conventional example. The average gain is improved across the DCS / PCS and UMTS bands. In particular, the gain on the low frequency side of each band is high. The average gain of the example shows −3 dB or more in the GSM band, and −2 dB or more in the DCS / PCS and UMTS bands, which is a high gain.

  In the conventional example, the VSWR shown in FIG. 20 is suddenly high on both the low frequency side and the high frequency side of each band. However, in the embodiment, the low frequency side and the high frequency side are flat and low. / PCS and UMTS bands are 3.5 or less. Although not shown in the figure, it has been confirmed that even when the graph of FIG. 20 is extended to about 3 GHz for both gain and VSWR, the gain is flat and high, and VSWR shows low antenna characteristics.

  In the antenna device of the present invention, the antenna characteristics were also measured when the base portion was configured as described above and the conductor portion was formed of a wire (linear shape). In this case, a comparison was made between the gain and the VSWR when formed by sheet metal and wire (linear), but it was confirmed that there was no significant difference, and that there was almost no dependency on the width or thickness of the conductor portion. That is, in the antenna device according to the present invention, when the conductor portion is formed of a wire (wire shape), the shape freedom of the antenna can be further improved, so that communication equipment using this has excellent antenna characteristics in a wide band. While maintaining, space utilization efficiency can also be made high.

It is a figure which shows the antenna of embodiment of this invention. It is a figure which shows the antenna of other embodiment of this invention. It is a figure which shows the antenna of other embodiment of this invention. It is a figure which shows the antenna of other embodiment of this invention. It is a figure which shows the antenna of other embodiment of this invention. It is a figure which shows the antenna of other embodiment of this invention. It is a figure which shows the antenna of other embodiment of this invention. It is a figure which shows the antenna of other embodiment of this invention. It is a figure which shows the example of the base | substrate used for the antenna of embodiment of this invention. It is a figure which shows the connection state of the base | substrates which concern on embodiment of this invention. It is a figure which shows the structural example of the base | substrate used for the antenna of embodiment of this invention. It is a figure which shows the example of fixation of the base | substrate used for the antenna of embodiment of this invention. It is a figure which shows the example of fixation of the antenna element used for the antenna of embodiment of this invention. It is a figure which shows the adjustment method of the antenna of embodiment of this invention. It is a figure which shows the adjustment method of the antenna which concerns on embodiment of this invention. It is a figure which shows the example of the matching circuit used for the antenna which concerns on embodiment of this invention. It is a figure which shows the Example of the antenna apparatus using the antenna which concerns on embodiment of this invention. It is a figure which shows the prior art example of the antenna device which concerns on embodiment of this invention. It is a figure which shows the actual measurement example of the average gain of the antenna apparatus of embodiment of this invention. It is a figure which shows the example of actual measurement of VSWR of the antenna apparatus of embodiment of this invention. It is a figure which shows the resonant frequency of the conductor part of embodiment of this invention. It is a perspective view showing the example of the antenna which concerns on one embodiment of this invention. It is a top view showing the example of the antenna which concerns on one embodiment of this invention. It is a perspective view showing the example of the antenna which concerns on another embodiment of this invention. It is a perspective view showing the example of the antenna which concerns on another embodiment of this invention. It is a perspective view showing the example of the antenna which concerns on another embodiment of this invention. It is a top view showing the example of the antenna which concerns on another embodiment of this invention. It is a top view showing the example of the antenna which concerns on another embodiment of this invention.

Explanation of symbols

a, 35, 41: Antenna A: Antenna devices 1, 2, 3, 3 ′, 4, 21, 42: Antenna elements 5, 6, 6 ′, 7, 150, 150a, 150b: Conductors 8, 9, 9 ′ DESCRIPTION OF SYMBOLS 10: Base | substrate 11: Feeding line 12, 13, 14, 15: Connection conductor 16m: Main board | substrate
16a: Sub-substrate (antenna substrate) 25, 26: Magnetic member 27: Fixed electrode
27a: Capacitance component 28: Feed electrode 29: Transmission / reception circuit 30: Ground electrode
31: Matching circuit 33: Mobile phone 36: Case 37A: Projection
40: Ground part 40a: End part of ground part 50: Space (opening)
60: Conductor 100, 100 ', 200:
Conductor 150: Conductor W, W1: Distances f1, f2: Frequency LT, RT: Both ends L1, L2, L3, L4: Predetermined length

Claims (21)

  A first antenna element having a base body and a conductor passing through the base body; and a second antenna element having a plate-like or linear conductor portion and a connection conductor. One end of the conductor is connected to the connection conductor of the second antenna element, and the connection conductor of the second antenna element is connected to the middle of the conductor portion of the second antenna element.   A first antenna element having a base, a conductor passing through the base, a second antenna element having a plate-like or linear conductor and a connecting conductor, and a plate-like, linear conductor, etc. And a third antenna element having a connection conductor, one end of the conductor of the first antenna element being connected to the connection conductor of the second antenna element, and the other end of the conductor of the first antenna element Is connected to the connection conductor of the third antenna element, the connection conductor of the second antenna element is connected in the middle of the conductor portion of the second antenna element, and the connection conductor of the third antenna element is the An antenna that is connected in the middle of a conductor portion of a third antenna element.   A first antenna element having a base, a conductor passing through the base, and a third antenna element having a plate-like or linear conductor and a connection conductor; The antenna is characterized in that the other end of the conductor is connected to the connection conductor of the third antenna element, and the connection conductor of the third antenna element is connected in the middle of the conductor portion of the third antenna element.   The antenna according to claim 1, wherein the base is composed of a plurality of bases.   5. The antenna according to claim 1, wherein the surfaces of the conductor portions of the second antenna element and the third antenna element are erected vertically to the ground plane of the substrate.   The antenna according to claim 1, wherein the conductor portions and the connection conductors of the second antenna element and the third antenna element are made of a metal conductive plate, a metal conductive foil, or a metal conductive wire.   7. The antenna according to claim 1, wherein the conductor portions of the second antenna element and the third antenna element have a U shape, an arc shape, and an L shape.   The antenna according to claim 1, wherein the connection conductor includes a feed line. The distance between one side of the conductor part parallel to the antenna side ground part end of the main circuit board and the antenna side ground part end of the main circuit board is in the range of 6 to 10 mm,
The antenna according to claim 1, wherein an end portion closest to the ground portion of the conductor portion and an antenna-side ground portion end portion are close to each other.   The antenna according to claim 1, wherein the plurality of conductors of the base are connected to each other, and are arranged in a linear shape, a meander shape, an L shape, a crankshaft shape, or an arc shape. .   The antenna according to claim 1, wherein the antenna element is fixed by a resin or a resin case. A first antenna element having an antenna base and a first conductor penetrating the antenna base;
The first antenna element constituting the first antenna element is formed at one point on the second conductor disposed at a predetermined length and on the second conductor located at a predetermined distance from both ends of the second conductor. A second antenna element in which one end of the conductor is electrically connected;
An antenna comprising: An antenna according to claim 12,
The first antenna element constituting the first antenna element is formed at one point on the third conductor disposed at a predetermined length and on the third conductor located at a predetermined distance from both ends of the third conductor. The antenna further comprising the 3rd antenna element which electrically connected the edge part by the side which is not connected to the said 2nd conductor among the edge parts of a conductor. An antenna according to claim 13,
The first and third antenna elements are provided on a substrate,
The antenna according to claim 3, wherein the third conductor is a plate-like conductor standing substantially perpendicular to the ground surface of the substrate. The antenna according to claim 13 or 14,
The antenna is characterized in that the third conductor is bent or curved and disposed on the substrate. The antenna according to any one of claims 12 to 15,
A plurality of antenna bases are provided, and the first conductor penetrates each of the plurality of antenna bases. The antenna according to any one of claims 12 to 16,
The first and second antenna elements are provided on a substrate,
2. The antenna according to claim 1, wherein the second conductor is a plate-like conductor standing substantially perpendicular to the ground surface of the substrate. The antenna according to any one of claims 12 to 17,
The antenna is characterized in that the second conductor is bent or curved and disposed on the substrate. The antenna according to any one of claims 12 to 18,
The antenna is characterized in that the entire length of the first conductor is linear, meandered, L-shaped, crank-shaped, or arc-shaped.   An antenna device comprising: the antenna according to claim 1; and a substrate on which the antenna is mounted.   A communication device comprising the antenna according to any one of claims 1 to 19 or the antenna device according to claim 20.

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