JP2013098707A - Multi-resonant antenna and electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-resonant antenna which minimizes the number of components and an occupied space in an electronic device, and achieves highly reliable electrical and mechanical connection, and to provide the electric device using the multi-resonant antenna.SOLUTION: A multi-resonant antenna includes: a dielectric block 3; a first conductor 1; and a second conductor 2. The dielectric block 3 has a rod like shape. The first conductor 1 extends in the length direction of the dielectric block 3 in the dielectric block 3 and one end of the first conductor 1 is led out from the one end side of the dielectric block 3 to the exterior. The second conductor 2 is arranged along the length direction of the dielectric block 3 and is composed of a conductor film provided on a surface of the dielectric block 3.

Description

  The present invention relates to a multi-resonant antenna and an electronic device using the same.

  A double resonance antenna (sometimes referred to as a dual band antenna or a multi band antenna) includes two antenna electrodes having different resonance frequencies on one chip. Different frequency bands can be accommodated. As an example of a device using a multi-resonant antenna, a mobile communication device having a GPS (Global Positioning System) function and a Bluetooth (registered trademark hereinafter omitted) function, for example, a mobile phone can be cited. GPS uses radio waves in the 1.57 GHz band, and Bluetooth uses radio waves in the 2.45 GHz band, and a multi-resonance antenna that can handle these frequency bands is required. As such a multi-resonant antenna, for example, Patent Document 1 discloses an antenna in which a low-frequency antenna electrode and a high-frequency antenna electrode are provided on the main surface of a dielectric substrate.

  Recently, with the development of information technology, mobile phones and the like have come to include data with a large amount of information such as images in data exchanged via wireless LAN. Therefore, among the information transmitted and received by the wireless LAN, data having a large amount of information is transmitted and received in a high-frequency band (for example, 5.2 GHz band) having a high transmission rate, and normal data is transmitted in a low-frequency band (for example, 2. The 45-GHz band is used for different purposes.

  In the above-described multi-resonant antenna, the low-frequency side antenna electrode and the high-frequency side antenna electrode have a so-called bifurcated pattern in which one end is commonly connected to one feeding end and the other end is a free end. Generally, the antenna electrical length to the end is λ / 4.

  In a notebook computer suitable for wireless communication, generally, a multi-resonant antenna for wireless communication is arranged at the periphery of a display constituted by a liquid crystal display device, while a circuit part constituting a part of a transmission / reception circuit is a keyboard. Is arranged. Therefore, it is necessary to connect the wireless communication multi-resonance antenna disposed on the periphery of the display to a circuit portion built in the keyboard using a coaxial cable.

  As described above, this type of multi-resonant antenna for wireless communication must be placed in a narrow space left on the periphery of the display when taking a notebook computer as an example. Must be able to respond. Moreover, the structure must be such that the electrical and mechanical connection of the multi-resonant antenna circuit can be stably maintained over a long period of time against unexpected impacts associated with carrying, and accompanying display opening / closing operations.

  However, in the multi-resonance antenna described in the patent document, since the antenna electrode is provided on the same surface, there is a limit to downsizing, and in the application to high-density mounting electronic devices such as notebook personal computers, There is room for improvement.

JP 2005-167762 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-resonant antenna and an electronic device using the same, which require a minimum number of components and can minimize the occupied space in the electronic device.

  Another object of the present invention is to provide a multi-resonance antenna with high electrical / mechanical connection reliability and an electronic device using the same.

  In order to solve the above-described problem, a multi-resonant antenna according to the present invention includes a dielectric block, a first conductor, and a second conductor. The dielectric block has a rod shape. The first conductor extends in the length direction inside the dielectric block, and one end thereof is led out from the one end side of the dielectric block. The second conductor is a conductor film provided on the surface along the length direction of the dielectric block.

  As described above, in the multi-resonant antenna according to the present invention, the dielectric block has a rod shape, and has the first conductor extending in the length direction inside the dielectric block. In this structure, the second conductor is provided as a conductor film on the surface along the length direction of the dielectric block. According to this structure, the relative permittivity of the dielectric block, the length and position of the first conductor, the capacitor generated between the first conductor and the second conductor, and further between the second conductor and the ground A multi-resonant antenna whose resonance frequency is determined depending on the distance or the like can be obtained. The double-resonant antenna is basically a dielectric block, and has a structure in which a second conductor consisting of a first conductor and a conductor film is provided inside and outside of the dielectric block. Therefore, a minimum number of parts is required, and the occupied space in the electronic device is minimized. obtain.

  In addition, since one end of the first conductor is led to the outside from one end side of the dielectric block, conventionally, the central conductor of the coaxial cable connected to the antenna conductor is connected to the inside of the dielectric block. It is possible to adopt a configuration in which the components are arranged on the outside and led out as they are. For this reason, a highly resonant multi-resonant antenna with electrical and mechanical connection is realized.

  As is well known, the coaxial cable has a structure in which a central conductor is covered with an insulating layer, the insulating layer is covered with a shield layer, and the shield layer is covered with a jacket layer. . Therefore, the jacket layer and the shield layer are removed with a predetermined length from the tip. Then, the central conductor and the covering insulating layer remaining after being removed in this manner are inserted into the dielectric block and used as the first conductor.

  As described above, a multi-resonant antenna is realized in which the central conductor of the coaxial cable serving as the feeder line is used as it is as the first conductor. For this reason, unlike the prior art in which a coaxial cable as a feed line is connected to a multi-resonant antenna, the first conductor is unified as the central conductor of the coaxial cable, minimizing the number of parts and minimizing the occupied space. Achieved. In addition, since there is no connection portion such as a soldering portion between the first conductor and the coaxial cable, there is no room for an open failure such as the connection between the two being cut at the soldering portion. In addition, the first conductor has a structure in which the central conductor of the coaxial cable is covered with an insulating layer and does not have a shield layer, so that a short failure between the central conductor and the shield layer does not occur. Moreover, since a troublesome soldering process is not required, it can contribute to cost reduction.

  In addition, since the multi-resonant antenna according to the present invention includes a dielectric block, and the dielectric block covers the first conductor, the reduction by the wavelength shortening effect can be achieved by selecting the relative permittivity of the dielectric block. Necessary characteristics can be ensured while aiming.

  As a specific form, one end of the second conductor may be located on the one end side of the dielectric block, and the other end may be located on an intermediate portion in the length direction of the dielectric block.

  As another aspect, one end and the other end of the second conductor may be located at an intermediate portion in the length direction of the dielectric block.

  As yet another aspect, the second conductor may have one end located on the opposite side of the dielectric block from the one end and the other end located at an intermediate portion in the length direction of the dielectric block.

  Each of the three modes described above exhibits different antenna characteristics and can be selectively used according to the required characteristics.

  As a preferred embodiment, a structure in which the dielectric block has holes extending in the length direction and the first conductor is inserted into the holes can be adopted. As another form, the dielectric block may be divided into at least a plurality of divided pieces, and each of the divided pieces may be coupled to each other. As a form of division, the dielectric block may be divided along the length direction of the central conductor and the insulating layer. In this case, it is not necessary for all of the divided pieces to have the same relative dielectric constant, and at least one of the divided pieces may have a relative dielectric constant different from that of the other divided pieces.

  The first conductor may be disposed on the center line of the dielectric block, or may be disposed at a position off the center line.

  The present invention further discloses an electronic device including a communication unit together with the above-described multi-resonant antenna. A typical example of such an electronic device is a notebook personal computer.

  As described above, this type of multi-resonant antenna for wireless communication must be placed in a narrow space left on the periphery of the display when taking a notebook computer as an example. Must be able to respond. Moreover, the structure must be such that the electrical and mechanical connection of the multi-resonant antenna circuit can be stably maintained over a long period of time against unexpected impacts associated with carrying, and accompanying display opening / closing operations.

  In addition, the technique using a coaxial cable as an antenna is known (for example, Unexamined-Japanese-Patent No. 2008-153816). However, this prior art does not relate to a double resonance antenna. In addition, since it is composed of two parts, an L-type element and a coaxial cable, the number of parts increases, the occupied space on the notebook computer increases, and the troublesome soldering between the L-type element and the coaxial cable is required. In addition, there are problems such as a decrease in the reliability of electrical and mechanical connection due to having a soldered portion.

As described above, according to the present invention, the following effects can be obtained.
(A) It is possible to provide a multi-resonant antenna and an electronic device using the same, which require a minimum number of parts and can minimize the occupied space in the electronic device.
(B) It is possible to provide a multi-resonance antenna with high electrical / mechanical connection reliability and an electronic device using the same.
(C) It is possible to provide a multi-resonant antenna capable of ensuring necessary characteristics while reducing the size of the first conductor due to the wavelength shortening effect, and an electronic device using the same.

  Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are merely examples.

It is sectional drawing which shows one Embodiment of the multiple resonance antenna which concerns on this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. It is a figure which shows a part of notebook-type personal computer incorporating the double resonance antenna shown in FIGS. It is the figure which expanded a part of FIG. It is a figure which shows another example of the notebook-type personal computer incorporating the double resonance antenna shown in FIGS. It is a figure which shows another example of the notebook-type personal computer incorporating the double resonance antenna shown in FIGS. It is sectional drawing which shows another example of the multiple resonance antenna which concerns on this invention. It is a figure which shows the example of the notebook-type personal computer incorporating the double resonance antenna shown in FIG. It is a figure which shows another example of the notebook-type personal computer incorporating the double resonance antenna shown in FIG. It is a figure which shows another example of the notebook-type personal computer incorporating the double resonance antenna shown in FIG. It is sectional drawing which shows another example of the multiple resonance antenna which concerns on this invention. It is a figure which shows the example of the notebook-type personal computer incorporating the double resonance antenna shown in FIG. It is a figure which shows another example of the notebook-type personal computer incorporating the double resonance antenna shown in FIG. It is a figure which shows another example of the notebook-type personal computer incorporating the double resonance antenna shown in FIG. It is a figure which shows the return loss characteristic with respect to the GPS electromagnetic wave of the multiple resonance antenna which concerns on this invention. It is a figure which shows the efficiency characteristic with respect to the GPS electromagnetic wave of the multiple resonance antenna which concerns on this invention. It is a figure which shows the return loss characteristic with respect to the Bluetooth radio wave of the multiple resonance antenna which concerns on this invention. It is a figure which shows the efficiency characteristic with respect to the Bluetooth radio wave of the multiple resonance antenna which concerns on this invention. It is a figure which shows another form of the multiple resonance antenna which concerns on this invention. It is a figure which shows another form of the multiple resonance antenna which concerns on this invention. It is a figure which shows another form of the multiple resonance antenna which concerns on this invention.

  First, referring to FIG. 1, the multi-resonant antenna according to the present invention includes a dielectric block 3, a first conductor 1, and a second conductor 2. The dielectric block 3 has a rod shape having a length L1 and a width W1. The dielectric block 3 shown in the embodiment has a quadrangular cross section having an upper surface, a lower surface, a front surface, and a back surface, but may be other polygonal cross sections, circular cross sections, elliptical cross sections, or a combination thereof. . The dielectric block 3 may be an organic dielectric material, an inorganic dielectric material, or a composite dielectric material in which an organic dielectric material and an inorganic dielectric material are mixed. May be.

  The first conductor 1 extends in the length direction inside the dielectric block 3, one end is led out from the one end side of the dielectric block 3, and a portion inside the dielectric block 3 is It functions as the antenna portion 105.

The second conductor 2 is a conductor film provided on the surface along the length direction of the dielectric block 3. The 2nd conductor 2 can be comprised by what has Cu as a main component. In consideration of weather resistance, oxidation resistance, wear resistance, etc., a multilayer plating structure may be used. The illustrated second conductor 2 has one end positioned on one end side of the dielectric block 3 and the other end positioned in an intermediate portion in the length direction of the dielectric block 3. The length L2 of the second conductor 2 is selected according to the resonance frequency. The dielectric block 3 of this embodiment is assumed to be compatible with 1.57 GHz band GPS radio waves and 2.45 GHz band Bluetooth radio waves, and the total length L2 and width W2 thereof are set to the total length L1 and width of the dielectric block 3. The value is slightly smaller than approximately half of W1. However, the resonance frequency of the multi-resonant antenna includes the relative permittivity of the dielectric block 3, the length and position of the first conductor 1, the capacitor generated between the first conductor 1 and the second conductor 2, Since it is determined depending on the distance between the second conductor 2 and the ground, etc., when these constants change, the length L1 and width W1 of the dielectric block 3, and further the length of the second conductor 2 Since L2 and width W2 also change, the figure is only an example.

  The first conductor 1 can be preferably configured using a coaxial cable. As is well known, in the coaxial cable, the center conductor 101 is covered with an insulating layer 102, the insulating layer 102 is covered with a shield layer 103, and the shield layer 103 is covered with a jacket layer 104. Yes.

  The central conductor 101 is generally composed of a Cu wire, the insulating layer 102 is composed of, for example, polyethylene, and the shield layer 103 is composed of a braided copper wire. The jacket layer 104 is made of, for example, vinyl. The inner diameter of the shield layer 103, the diameter of the central conductor 101, and the relative dielectric constant εr1 of the insulating layer 102 are determined so that the characteristic impedance of the coaxial cable is, for example, 50Ω.

  The general coaxial cable described above has a removed portion 105 from which the sheath layer 104 and the shield layer 103 are removed with a predetermined length from the distal end thereof. , Function as an antenna part.

  The dielectric block 3 covers the removed portion 105 from which the jacket layer 104 and the shield layer 103 are removed. The removed portion 105 may be disposed on the center line of the dielectric block 3 or may be disposed at a position off the center line. The dielectric block 3 may be configured such that the front end of the central conductor 101 ends on the inside of the dielectric block 3 on the front end side, and the outer covering layer 104 of the coaxial cable is partially formed on the rear end side. You may make it cover. Furthermore, the shape is not limited to the illustrated rectangular cross-section, and may be another polygonal shape, a circular cross-section or an elliptical cross-section. In short, the dielectric block 3 can take any external shape and cross-sectional shape.

  As a specific form, the dielectric block 3 has a straight hole extending in the length direction, and the removal portion 105 is inserted into the hole. The removed portion 105 is preferably bonded and fixed to the inner peripheral surface of the hole with an adhesive or the like. In order to reduce the influence of the relative dielectric constant of the adhesive, it is preferable that the bonding location is limited to, for example, the introduction port.

  The multi-resonant antenna described above has a multi-resonance characteristic having a plurality of resonance frequencies of the first conductor 1 and the second conductor 2. Specifically, it is a multi-resonant antenna that resonates at frequencies of 1.57 GHz band GPS radio waves and 2.45 GHz band Bluetooth radio waves.

As described above, in the multi-resonant antenna according to the present invention, the dielectric block 3 has a rod shape, and has the first conductor 1 extending in the length direction inside the dielectric block 3. In this structure, the second conductor 2 is provided as a conductor film on the surface along the length direction of the dielectric block 3. According to this structure, the relative dielectric constant of the dielectric block 3, the length and position of the first conductor 1, the capacitor generated between the first conductor 1 and the second conductor 2, and the second conductor 2 A multi-resonant antenna whose resonance frequency is determined depending on the distance between the ground and the like can be obtained. The multi-resonant antenna has a structure in which the dielectric block 3 is basically used, and the first conductor 1 and the second conductor 2 made of a conductor film are provided on the inside and outside of the antenna. Can be minimized.

  In addition, since one end of the first conductor 1 is led out from the one end side of the dielectric block 3, an embodiment in which the central conductor of the coaxial cable serving as the feeder line is used as the first conductor 1 as it is. Can be taken.

  Furthermore, since the multi-resonant antenna according to the present invention includes the dielectric block 3, and the dielectric block 3 covers the removal portion 105, the wavelength reduction effect can be achieved by selecting the relative permittivity εr2 of the dielectric block 3. Necessary characteristics can be ensured while the removal portion 105 is reduced. Since the removal portion 105 is covered with the insulating layer 102 of the coaxial cable, a wavelength shortening effect is produced by the relative dielectric constant εr1, but the relative dielectric constant εr1 of the insulating layer 102 of the coaxial cable is specified by the coaxial cable manufacturer. It is not possible for the user to select arbitrarily. In the present invention, since the dielectric block 3 that covers the removal portion 105 is provided separately from the coaxial cable, the relative permittivity εr2 of the dielectric block 3 can be selected to increase the wavelength shortening effect. From the viewpoint of shortening the wavelength, the dielectric constant εr2 of the dielectric block 3 is higher than the relative dielectric constant εr1 of the insulating layer 102 of the coaxial cable.

  The multi-resonant antenna according to the present invention is used for an electronic device having a communication function suitable for a wireless LAN, for example. As such an example, FIGS. 4 and 5 illustrate application to a notebook personal computer 7 having a keyboard 701 and a display 702.

  4 and 5, the multi-resonant antenna 5 according to the present invention is disposed in a narrow space 703 left around the display 702. The multi-resonant antenna 5 is disposed in the space 703 so that the film surface of the second conductor 2 is orthogonal to the surface of the ground conductor 705 formed as a planar pattern on the substrate or the like. More specifically, the second conductor 2 is on an upper surface far from the ground conductor 705 among the upper and lower surfaces of the dielectric block 3 facing each other. The first conductor 1 made of a coaxial cable is guided along a frame body 704 that borders the periphery of the display 702, and is attached to the ground conductor 705 disposed outside the frame body 704 from above the covering layer 104 with the adhesive tape 706. Fixed with etc. Then, the shield layer 103 exposed by peeling off the covering layer 104 is fixed to the ground conductor 705 by means such as soldering 707.

  The coaxial cable shown in the embodiment has a predetermined length L1 from the tip, and has the removed portion 105 from which the jacket layer 104 and the shield layer 103 are removed. A multi-resonant antenna 5 using 101 as it is is realized. For this reason, for example, unlike the prior art in which a coaxial cable serving as a feeder line is connected to an L-shaped element, the removal portion 105 is unified as the central conductor 101 of the coaxial cable, minimizing the number of parts, Minimization of the occupied space 703 at the time of mounting on the device is achieved.

  In addition, except for the case where the shield layer 103 is soldered to the ground conductor 705 of the electronic device, there is no connection portion such as a soldering portion between the removal portion 105 and the coaxial cable. There is no room for open failures such as disconnection.

  In addition, the removed portion 105 has a structure in which the center conductor 101 is covered with the insulating layer 102 and does not have the shield layer 103. Therefore, a short-circuit failure between the center conductor 101 and the shield layer 103, which is a problem in the past, may occur. Absent. Moreover, since a troublesome soldering process is not required, it can contribute to cost reduction.

In the multi-resonant antenna 5 according to the present invention, antenna characteristics such as return loss and radiation efficiency vary depending on the relative relationship between the film surface of the second conductor 2 and the ground conductor 705. Therefore, the antenna characteristics can be changed by changing the relative relationship between the film surface of the second conductor 2 and the ground conductor 705. An example is shown in FIGS. In these drawings, parts corresponding to those shown in FIGS. 4 and 5 are denoted by the same reference numerals, and redundant description is omitted. First, in the embodiment of FIG. 6, the second conductor 2 is on the side surface between the upper surface and the lower surface of the dielectric block 3 facing each other. Next, in the embodiment shown in FIG. 7, the second conductor 2 is on the lower surface close to the ground conductor 705 among the upper and lower surfaces of the dielectric block 3 facing each other.

  Furthermore, the antenna characteristics of the multi-resonant antenna 5 according to the present invention can be changed by changing the relative position of the second conductor 2 with respect to the dielectric block 3. An example is shown in FIG. In FIG. 8, parts corresponding to those shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted. In FIG. 8, one end and the other end of the second conductor 2 are located in the middle portion of the dielectric block 3 in the length direction. More specifically, one end of the second conductor 2 is inward by a length L3 from one end of the dielectric block 3, and the other end is inward by a length L4 from the other end of the dielectric block 3.

  9 to 11 show examples of electronic devices using the multi-resonant antenna 5 shown in FIG. First, in FIG. 9, the multi-resonant antenna 5 is disposed in the space 703 so that the film surface of the second conductor 2 is orthogonal to the plate surface of the ground conductor 705. More specifically, the second conductor 2 is on an upper surface far from the ground conductor 705 among the upper and lower surfaces of the dielectric block 3 facing each other.

  In FIG. 10, the second conductor 2 is on the side surface between the upper and lower surfaces of the dielectric block 3 that face each other. Next, in the embodiment shown in FIG. 11, the second conductor 2 is on the lower surface close to the ground conductor 705 among the upper and lower surfaces of the dielectric block 3 facing each other.

  FIG. 12 shows still another embodiment of the multi-resonant antenna 5 according to the present invention. In FIG. 12, parts corresponding to those shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted. In FIG. 12, one end of the second conductor 2 is located on the opposite side of the one end of the dielectric block 3, and the other end is located in an intermediate portion in the length direction of the dielectric block 3. Specifically, one end of the second conductor 2 is on the inside from the one end of the dielectric block 3 by a length L5.

  13 to 15 show examples of electronic devices using the multi-resonant antenna 5 shown in FIG. First, in FIG. 13, the multi-resonant antenna 5 is disposed in the space 703 so that the film surface of the second conductor 2 is orthogonal to the plate surface of the ground conductor 705. More specifically, the second conductor 2 is on an upper surface far from the ground conductor 705 among the upper and lower surfaces of the dielectric block 3 facing each other.

  In FIG. 14, the second conductor 2 is on the side surface between the upper and lower surfaces of the dielectric block 3 facing each other. In the embodiment shown in FIG. 15, the second conductor 2 is on the lower surface close to the ground conductor 705 among the upper and lower surfaces of the dielectric block 3 facing each other.

  Next, antenna characteristics when the multi-resonant antenna 5 according to the present invention is incorporated in an electronic device will be described with reference to FIGS. In these drawings, a curve A shows the antenna characteristics when the multi-resonant antenna 5 shown in FIG. 1 is arranged as shown in FIGS. 4 and 5, and a curve B shows the multi-resonant antenna 5 shown in FIG. 9 shows the characteristics of the antenna when the arrangement shown in FIG. 9, curve C shows the characteristics of the double-resonant antenna 5 shown in FIG. 12, and the characteristics shown when the arrangement shown in FIG. The characteristics when the arrangement shown in FIG. 6 is taken, and the curve G shows the antenna characteristics when the multi-resonant antenna 5 shown in FIG. 1 is arranged as shown in FIG.

  FIG. 16 shows the return / loss characteristics for 1.57 GHz band GPS radio waves, and FIG. 17 shows the efficiency characteristics as well. FIG. 18 shows the return / loss characteristics for the 2.45 GHz band Bluetooth radio wave, and FIG. 19 shows the efficiency characteristics as well.

  As can be understood from FIGS. 16 to 19, according to the multi-resonant antenna 5 according to the present invention, necessary antenna characteristics are obtained in both 1.57 GHz band GPS radio waves and 2.45 GHz band Bluetooth radio waves. Can be secured.

  Further, depending on the relative position of the second conductor 2 with respect to the dielectric block 3, the return loss and the efficiency change in both the GPS radio wave and the Bluetooth radio wave. Further, when used as an electronic device, as is clear from the comparison of characteristics A, D, and G, even if the relative position of the second conductor 2 with respect to the dielectric block 3 is the same, the second conductor 2 with respect to the ground electrode The antenna characteristics change depending on the relative position. Although illustration is omitted, the antenna characteristics necessary for both the GPS radio wave and the Bluetooth radio wave can be secured in the same manner in other forms of the multi-resonant antenna 5 and an electronic device using the same.

  Next, referring to FIG. 20, the dielectric block 3 is divided into a plurality of n (= 2) divided pieces 301 and 302. In the embodiment of FIG. 20, the dielectric block 3 is divided along the length direction of the central conductor 101 and the insulating layer 102. The second conductor 2 is disposed on the surface of either the divided piece 301 or 302. The divided pieces 301 and 302 need not have the same relative dielectric constant. For example, as shown in FIG. 20, when the dividing line is arranged in the vertical direction, the relative dielectric constant εr21 of the divided piece 301 on the side close to the ground conductor 705 is more than the relative dielectric constant εr22 of the divided piece 302. By increasing the height, the wavelength shortening effect can be promoted.

  Alternatively, as shown in FIG. 21, when the dividing line is arranged so as to face the horizontal direction, the relative dielectric constant εr21 of the lower divided piece 301 close to the ground conductor 705 is set to the relative dielectric constant of the upper divided piece 302. By making it higher than the rate εr22, the wavelength shortening effect can be promoted.

  Furthermore, the multiple resonance antenna 5 according to the present invention can include a reinforcing member 9 as shown in FIG. The reinforcing member 9 is fitted into the coaxial cable, and one end surface is pressed against the end surface of the dielectric block 3. According to this configuration, it is possible to avoid sudden bending of the coaxial cable at the boundary with the dielectric block 3 and to prevent the coaxial cable from being damaged or broken by bending. The reinforcing member 9 can be made of rubber or plastic, for example.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 1st conductor 2 2nd conductor 3 Dielectric block 101 Center conductor 102 Insulating layer 103 Shielding layer 104 Outer layer

Claims (13)

A multi-resonant antenna including a dielectric block, a first conductor, and a second conductor,
The dielectric block is rod-shaped,
The first conductor extends in the length direction inside the dielectric block, and one end is led out from one end side of the dielectric block,
The second conductor is a conductor film provided on the surface along the length direction of the dielectric block,
Double resonance antenna. The multi-resonant antenna according to claim 1, comprising a coaxial cable,
The coaxial cable is coated with an insulating layer around a central conductor, a shield layer is coated around the insulating layer, a jacket layer is coated around the shield layer, and has a predetermined length from the tip, Having the removed portion of the jacket layer and the shield layer;
The portion constitutes the first conductor;
Double resonance antenna.   3. The multi-resonant antenna according to claim 1, wherein one end of the second conductor is positioned on the one end side of the dielectric block and the other end is an intermediate portion in the length direction of the dielectric block. A double-resonant antenna located in the area.   3. The multi-resonant antenna according to claim 1, wherein one end and the other end of the second conductor are located at an intermediate portion in a length direction of the dielectric block. 4.   3. The multi-resonant antenna according to claim 1, wherein one end of the second conductor is located on a side opposite to the one end of the dielectric block, and the other end is in a length direction of the dielectric block. A double-resonant antenna located in the middle.   6. The multi-resonant antenna according to claim 1, wherein the dielectric block is divided into at least a plurality of divided pieces, and each of the divided pieces is coupled to each other.   The multi-resonant antenna according to claim 6, wherein the dielectric block is divided along a length direction of the central conductor and the insulating layer.   The multi-resonant antenna according to claim 6 or 7, wherein at least one of the divided pieces has a relative dielectric constant different from that of the other divided pieces. An electronic device including a multiple resonance antenna and a communication unit,
The antenna is described in any one of claims 1 to 8, and is connected to the communication unit.
Communication device. The electronic device according to claim 9, comprising:
The communication unit has a ground conductor,
The ground conductor has a ground electrode on the substrate surface,
The multi-resonant antenna is disposed on a side portion of the ground conductor, and a film surface of the second conductor is in a relationship orthogonal to a surface of the ground conductor.
Electronic devices. The electronic device according to claim 10, comprising:
The second conductor is on an upper surface far from the ground conductor among the upper and lower surfaces facing the dielectric block.
Electronic devices. The electronic device according to claim 10, comprising:
The second conductor is on the lower surface close to the ground conductor among the upper and lower surfaces facing the dielectric block.
Electronic devices. The electronic device according to claim 10, comprising:
The second conductor is on a side surface between the upper surface and the lower surface facing each other of the dielectric block,
Electronic devices.

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