JP4089680B2 - Antenna device - Google Patents

Antenna device Download PDF

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Publication number
JP4089680B2
JP4089680B2 JP2004302924A JP2004302924A JP4089680B2 JP 4089680 B2 JP4089680 B2 JP 4089680B2 JP 2004302924 A JP2004302924 A JP 2004302924A JP 2004302924 A JP2004302924 A JP 2004302924A JP 4089680 B2 JP4089680 B2 JP 4089680B2
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antenna device
conductor
antenna
conductor pattern
element body
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JP2005210680A (en
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高雄 横島
真介 行本
明裕 豊後
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三菱マテリアル株式会社
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Priority claimed from TW093140610A external-priority patent/TWI343671B/zh
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Description

  The present invention relates to an antenna device for a mobile communication radio device such as a mobile phone and a radio device such as a specific low-power radio or a weak radio.

  As a linear antenna, a monopole antenna is generally used in which a wire element having a length ¼ of the antenna operating wavelength is disposed on the ground plane. However, in order to reduce the size and height of the monopole antenna, an inverted L-shaped antenna in which the monopole antenna is bent halfway has been developed.

However, in this inverted L-type antenna, the reactance portion determined by the length of the horizontal portion of the antenna element that is parallel to the ground plane has a large capacitance value, so that it is difficult to match the 50Ω feed line. It was. Therefore, an inverted F-type antenna has been devised in order to facilitate matching between the antenna element and the 50Ω feed line. This inverted F-type antenna is provided with a stub that connects the ground plane and the radiating element in the vicinity of a feeding point provided in the middle of the antenna element, thereby canceling the capacitance by the reactance part and (E.g., see Patent Document 1).
Kyohei Fujimoto, "Illustration Mobile Antenna System", General Electronic Publishing, October 1996, p. 118-119

  However, in the conventional inverted-F antenna, the length of the horizontal portion of the antenna element parallel to the ground plane is required to be about 1/4 of the antenna operating wavelength. In the weak radio using, lengths of 170 mm and 240 mm are required, respectively. For this reason, it has been difficult to apply to a built-in antenna device of a practical wireless device in a 400 MHz band having a relatively low frequency.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an antenna device that can be miniaturized even in a relatively low frequency band such as a 400 MHz band.

The present invention employs the following configuration in order to solve the above problems. That is, the antenna device of the present invention includes a substrate, a conductor film provided on a part of the substrate, and a linear conductor provided on the substrate and formed in the longitudinal direction of an element body made of a dielectric material. A loading portion that is configured by a pattern and does not self-resonate at an antenna operating frequency; an inductor portion that connects one end of the conductor pattern to the conductor film and adjusts the antenna operating frequency; and the conductor provided on the substrate. A feeding point that feeds power to a connection point between one end of the pattern and the inductor part, the longitudinal direction of the loading part is arranged to be parallel to the edge of the conductor film, and the other end of the conductor pattern is It is characterized by being open.

According to the antenna device of the present invention, by combining the loading portion and the inductor portion, even if the physical length of the antenna element parallel to the edge of the conductor film is shorter than ¼ of the antenna operating wavelength, The length can be ¼ of the antenna operating wavelength. Accordingly, the physical length can be greatly shortened, and even an antenna device having a relatively low frequency such as a 400 MHz band as an antenna operating frequency can be applied to a built-in antenna device of a practical wireless device. theft is possible.

Also, the antenna device of the present invention, it is preferable that the capacitor unit is connected between the feed point and said connection point.
According to the antenna device of the present invention, the impedance of the antenna device at the feeding point is matched by providing the capacitor unit that connects the feeding point and one end of the conductor pattern and setting the capacitance of the capacitor unit to a predetermined value. Can be easily done.

In the antenna device of the present invention, it is preferable that the loading unit includes a lumped constant element.
According to the antenna device of the present invention, the electrical length is adjusted by the lumped constant element formed in the loading portion. Therefore, the resonance frequency can be easily set without changing the length of the conductor pattern of the loading portion. In addition, the impedance of the antenna device at the feeding point can be matched.

In the antenna device of the present invention, it is preferable that the capacitor unit includes a capacitor unit formed of a pair of planar electrodes formed on the element body and facing each other.
According to the antenna device of the present invention, the loading portion and the capacitor portion are integrated by forming a pair of planar electrodes facing each other on the element body. Thereby, the number of parts of the antenna device can be reduced.

In the antenna device of the present invention, it is preferable that one of the pair of planar electrodes is provided on the surface of the element body so as to be trimmed.
According to the antenna device of the present invention, by trimming one planar electrode formed on the surface of the element body, for example, by irradiating a laser, of the pair of planar electrodes forming the capacitor unit, Capacitance can be adjusted. Therefore, the impedance of the antenna device at the feeding point can be easily matched.

In the antenna device of the present invention, it is preferable that the multiple resonance capacitor portion is equivalently connected in parallel between two points having different conductor patterns.
According to the antenna device of the present invention, a resonance circuit is formed by the conductor pattern between two points and the multiple resonance capacitor portion connected in parallel to the conductor pattern. As a result, a small antenna device having a plurality of resonance frequencies can be obtained.

In the antenna device of the present invention, it is preferable that the conductor pattern has a spiral shape wound in the longitudinal direction of the element body.
According to the antenna device according to the present invention, since the conductor pattern has a spiral shape, the conductor pattern length can be increased, and the gain of the antenna device can be increased.

In the antenna device of the present invention, it is preferable that the conductor pattern has a meander shape formed on the surface of the element body.
According to the antenna device according to the present invention, since the conductor pattern has a meander shape, the conductor pattern length can be increased and the gain of the antenna device can be improved. Further, the conductor pattern is easily formed by forming the conductor pattern on the surface of the element body.

  According to the antenna device of the present invention, by combining the loading portion and the inductor portion, even if the physical length of the antenna element parallel to the edge of the conductor film is shorter than ¼ of the antenna operating wavelength, the electrical length is A quarter length of the antenna operating wavelength can be obtained. Therefore, the antenna device can be miniaturized, and can be applied to a built-in antenna device of a practical wireless device even in a relatively low frequency band such as a 400 MHz band.

Hereinafter, a first embodiment of an antenna device according to the present invention will be described with reference to FIGS. 1 and 2.
The antenna device 1 according to the present embodiment is an antenna device used for, for example, a mobile communication radio device such as a mobile phone and a radio device such as a specific low power radio and a weak radio.
As shown in FIGS. 1 and 2, the antenna device 1 includes a substrate 2 made of an insulating material such as a resin, a ground portion 3 that is a rectangular conductor film provided on the surface of the substrate 2, and a substrate. 2 is provided with a loading section 4, an inductor section 5, a capacitor section 6, and a feeding point P connected to a high-frequency circuit (not shown) provided outside the antenna device 1. ing. Then, the antenna operating frequency is adjusted by the loading unit 4 and the inductor unit 5, and radio waves are radiated at a center frequency of 430 MHz.

The loading portion 4 is configured by a conductor pattern 12 formed in a spiral shape with respect to the longitudinal direction of the surface of a rectangular parallelepiped element body 11 made of a dielectric material such as alumina.
Both ends of the conductor pattern 12 are respectively connected to connection electrodes 14A and 14B provided on the back surface of the element body 11 so as to be electrically connected to rectangular installation conductors 13A and 13B provided on the surface of the substrate 2. ing. In addition, one end of the conductor pattern 12 is electrically connected to the inductor portion 5 and the capacitor portion 6 via the installation conductor 13B, and the other end is an open end.
Here, the loading portion 4 is disposed so that the distance L1 from the end 3A of the ground portion 3 is 10 mm, for example, and the length L2 in the longitudinal direction of the loading portion 4 is 16 mm, for example. It has become.

  Since the loading unit 4 has a physical length shorter than ¼ of the antenna operating wavelength, the self-resonant frequency of the loading unit 4 is higher than the antenna operating frequency of 430 MHz. For this reason, when the antenna operating frequency of the antenna device 1 is considered as a reference, it cannot be said that the antenna device 1 is self-resonating.

The inductor unit 5 includes a chip inductor 21, and is connected to the installation conductor 13 </ b> B through an L-shaped pattern 22 that is a linear conductive pattern provided on the surface of the substrate 2. It is configured to be connected to the ground part 3 via a ground part connection pattern 23 which is a linear conductive pattern provided on the surface.
The inductance of the chip inductor 21 is adjusted so that the resonance frequency of the loading unit 4 and the inductor unit 5 is 430 MHz, which is the antenna operating frequency of the antenna device 1.
The L-shaped pattern 22 is formed so that the end side 22A is parallel to the ground portion 3, and the length L3 is 2.5 mm. As a result, the physical length L4 of the antenna element parallel to the end 3A of the ground portion 3 is 18.5 mm.

The capacitor unit 6 includes a chip capacitor 31 and is connected to the installation conductor 13B via the installation conductor connection pattern 32 which is a linear conductive pattern provided on the surface of the substrate 2 and is similarly formed on the substrate 2. The power supply point P is connected via a power supply point connection pattern 33 that is a linear conductive pattern provided on the surface.
The capacitance of the chip capacitor 31 is adjusted so as to match the impedance at the feeding point P.

FIG. 3 and FIG. 4 show the frequency characteristics of VSWR (Voltage Standing Wave Ratio) at the frequency of 400 to 450 MHz and the radiation pattern of the horizontal polarization and the vertical polarization of the antenna device 1 configured as described above. Show.
As shown in FIG. 3, this antenna device 1 has a frequency of 430 MHz, a VSWR of 1.05, and a bandwidth of 14.90 MHz at VSWR = 2.5.

Next, transmission / reception of radio waves in the antenna device 1 of the present embodiment will be described.
In the antenna device 1 having the above configuration, a high frequency signal having an antenna operating frequency transmitted from the high frequency circuit to the feeding point P is transmitted as a radio wave from the conductor pattern 12. A radio wave having a frequency that matches the antenna operating frequency is received by the conductor pattern 12 and transmitted from the feeding point P to the high frequency circuit as a high frequency signal.
At this time, radio waves are transmitted and received in a state where the power loss is reduced by the capacitor unit 6 having a capacitance capable of matching the input impedance of the antenna device 1 and the impedance at the feeding point P.

In the antenna device 1 configured in this manner, by combining the loading unit 4 and the inductor unit 5, even if the physical length of the antenna element parallel to the end 3 </ b> A of the ground unit 3 is 18.5 mm, Since the length is ¼ wavelength, the size can be significantly reduced to about 1/10 of about 170 mm, which is a ¼ wavelength of the electromagnetic wave of 430 MHz.
Thereby, it can be applied to a built-in antenna device of a practical wireless device even in a relatively low frequency band such as a 400 MHz band.

Moreover, since the conductor pattern 12 has a spiral shape wound in the longitudinal direction of the element body 11, the conductor pattern 12 can be lengthened, and the gain of the antenna device 1 can be improved.
Further, since the impedance matching at the feeding point P can be achieved by the capacitor unit 6, it is not necessary to provide a matching circuit between the feeding point P and the high frequency circuit, and a reduction in radiation gain due to the matching circuit is suppressed and efficient. Radio waves are sent to and received from.

Next, a second embodiment will be described with reference to FIG. In the following description, the same reference numerals are given to the components described in the above embodiment, and the description thereof is omitted.
The difference between the second embodiment and the first embodiment is that the antenna device 1 according to the first embodiment is connected to the feeding point P by the capacitor unit 6, but the antenna device 40 according to the second embodiment. Then, it is connected to the feeding point P by the feeding point connection pattern 41, and a chip inductor 42 is provided as a lumped constant element between the installation conductor 13B and the inductor section 5.
That is, in the antenna device 40, the loading unit 43 includes the installation conductor 13 </ b> B, the feeding point connection pattern 41 that connects the connection point between the loading unit 43 and the inductor unit 5 and the feeding point P, the conductor pattern 13, and the inductor unit 5. A connection conductor 44 to be connected and a chip inductor 42 provided on the connection conductor 44 are provided.

As in the first embodiment, the antenna device 40 configured in this way can be significantly shortened in physical length by combining the loading unit 43 and the inductor unit 5.
Further, since the electrical length of the loading portion 43 can be adjusted by the chip inductor 42, the resonance frequency can be easily set without adjusting the length of the conductor pattern 12.
Further, since impedance matching at the feeding point P can be achieved, a decrease in radiation gain due to the matching circuit is suppressed, and radio waves are efficiently transmitted and received.

  In the present embodiment, the inductor is used as the lumped constant element. However, the present invention is not limited to this, and a capacitor may be used, or an inductor and a capacitor connected in parallel or in series may be used.

Next, a third embodiment will be described with reference to FIG. In the following description, the same reference numerals are given to the components described in the above embodiment, and the description thereof is omitted.
The difference between the third embodiment and the first embodiment is that the antenna device 1 according to the first embodiment has a spiral shape in which the conductor pattern 12 of the loading unit 4 is wound in the longitudinal direction of the element body 11. However, the antenna device 50 according to the third embodiment is that the conductor pattern 52 of the loading portion 51 has a meander shape formed on the surface of the element body 11.
That is, a conductor pattern 52 having a meander shape is formed on the surface of the element body 11, and both ends of the conductor pattern 52 are connected to the connection electrodes 14A and 14B, respectively.

  The antenna device 50 configured as described above has the same operations and effects as the antenna device 1 in the first embodiment, but the meander-shaped loading unit 51 is formed by forming a conductor on the surface of the element body 11. Since it is configured, the loading portion 51 can be easily manufactured.

Next, a fourth embodiment will be described with reference to FIG. In the following description, the same reference numerals are given to the components described in the above embodiment, and the description thereof is omitted.
The difference between the fourth embodiment and the first embodiment is that, in the antenna device 1 according to the first embodiment, the capacitor unit 6 has a chip capacitor 31, and the antenna at the feeding point P by the chip capacitor 31. Although the impedance matching of the device 1 is achieved, the antenna device 60 according to the fourth embodiment has the first and second planar electrodes 62 that are a pair of planar electrodes that are formed on the element body 11 and face each other. , 63, and the impedance of the antenna device 60 at the feeding point P is matched by the capacitor unit 64.

That is, a conductor pattern 12 having a spiral shape is formed on the surface of the element body 11, and a first planar electrode 62 formed on the surface of the element body 11 and electrically connected to one end of the conductor pattern 12, A second planar electrode 63 disposed opposite to the first planar electrode 62 is formed inside the element body 11.
The first planar electrode 62 is configured so that it can be trimmed, for example, by forming a gap G by irradiating a laser, whereby the capacitance of the capacitor unit 64 can be changed.
The first planar electrode 62 is connected to a connection electrode 66A provided on the back surface of the element body 11 so as to be electrically connected to the rectangular installation conductors 13A, 65A, 65B provided on the surface of the substrate 2. ing.

Similarly to the first planar electrode 62, the second planar electrode 63 is also connected to a connection electrode 65B provided on the back surface of the element body 11 so as to be electrically connected to the installation conductor 65B. The installation conductor 65 </ b> B is electrically connected to the feed point P through the feed point connection pattern 33.
The inductor section 67 is connected to the installation conductor 65 </ b> B via the L-shaped pattern 22, which is a linear conductive pattern provided on the surface of the substrate 2 with the chip inductor 21.

The antenna device 60 configured as described above has the same operations and effects as the antenna device 1 in the first embodiment, but forms first and second planar electrodes 62 and 63 facing the element body 11. Thus, the loading unit 4 and the capacitor unit 64 are integrated. Therefore, the number of parts of the antenna device 60 can be reduced.
Moreover, since the capacitance of the capacitor part 64 can be changed by irradiating and trimming the first planar electrode 62 with a laser, the impedance at the feeding point P can be easily matched.

  In the antenna device 60 in the above-described fourth embodiment, the conductor pattern 12 has a spiral shape wound in the longitudinal direction of the element body 11, but as shown in FIG. 8, the third embodiment Similarly to the antenna device 70, the conductor pattern 52 may have a meander shape.

Next, a fifth embodiment will be described with reference to FIGS. In the following description, the same reference numerals are given to the components described in the above embodiment, and the description thereof is omitted.
The difference between the fifth embodiment and the first embodiment is that a multi-resonance capacitor unit 81 is connected in parallel to both ends of the conductor pattern 12 in the antenna device 80 according to the fifth embodiment.

  That is, as shown in FIG. 9, the multi-resonance capacitor unit 81 includes flat plate conductors 83A and 83B formed on the upper and lower surfaces of the element body 82A, a straight conductor 84A connecting the flat plate conductor 83A and the connection conductor 14A, and a flat plate conductor. 83B and a straight conductor 84B connecting the connection conductor 14B.

The element body 82A is stacked on the upper surface of the element body 82B stacked on the upper surface of the element body 11. The element bodies 82A and 82B are both made of the same material as that of the element body 11.
The flat conductor 83A is a substantially rectangular conductor, and is formed on the back surface of the element body 82A. The flat conductor 83B is a substantially rectangular conductor similar to the flat conductor 83A, and is formed on the upper surface of the element body 82A so as to partially face the flat conductor 83A.
These flat conductors 83A and 83B are connected to both ends of the conductor pattern 12 via straight conductors 84A and 84B, respectively, and are disposed to face each other via an element body 82A to form a capacitor.

As shown in FIG. 10, in the antenna device 80, an antenna unit 85 having a first resonance frequency is formed by a loading unit 4, an inductor unit 5, a capacitor unit 6, and a multi-resonance capacitor unit 81. And the loading portion 4 form a multiple resonance portion 86 having a second resonance frequency.
FIG. 11 shows the VSWR characteristics of the antenna device 80. As shown in the figure, the antenna unit 85 exhibits a first resonance frequency f1, and the double resonance unit 86 exhibits a second resonance frequency f2 having a frequency higher than the first resonance frequency f1. Note that the second resonance frequency can be easily changed by adjusting the material used for the element body 82A and the opposing areas of the flat conductors 83A and 83B.

  The antenna device 80 configured in this manner has the same operations and effects as those of the first embodiment described above. However, by connecting the multiple resonance capacitor portions 81 in parallel to both ends of the conductor pattern 12, A multi-resonant portion 86 having a second resonance frequency f2 different from the first resonance frequency f1 is formed. Therefore, for example, a small antenna apparatus having two resonance frequencies such as a 900 MHz band GSM (Global System for Mobile Communication) and a 1.8 GHz band DCS (Digital Cellular System) in Europe can be provided.

In the present embodiment, as shown in FIG. 12, an antenna device 88 in which a meander pattern 87 is formed at the tip of the loading unit 4 may be used.
The antenna device 88 is connected to the land 13 </ b> A of the loading unit 4 on the surface of the substrate 2, and a meander pattern 87 having a meander shape is formed.
The meander pattern 87 is arranged so that its long axis is parallel to the conductor film 3.
The antenna device 88 configured as described above can achieve a wide band and high gain of the antenna device by connecting the meander pattern 87 to the tip of the loading unit 4.

Next, a sixth embodiment will be described with reference to FIGS. In the following description, the same reference numerals are given to the components described in the above embodiment, and the description thereof is omitted.
The difference between the sixth embodiment and the fifth embodiment is that, in the antenna device 80 according to the fifth embodiment, one multi-resonance capacitor unit 81 is connected, but the antenna device according to the sixth embodiment. 90, the multi-resonance capacitor unit 91 connected in parallel between the tip of the conductor pattern 12 and the substantially central point of the conductor pattern 12, and the parallel connection between the base end of the conductor pattern 12 and the substantially central two points of the conductor pattern 12. It is a point provided with the multiple resonance capacitor part 92 connected.

  That is, as shown in FIG. 13, the multi-resonance capacitor unit 91 is composed of flat conductors 93A and 93B formed on the upper and lower surfaces of the element body 82A, and a straight conductor 94 connecting the flat conductor 93A and the connecting conductor 14A. ing. Similarly to the multi-resonance capacitor unit 91, the multi-resonance capacitor unit 92 is composed of flat plate conductors 95A and 95B and a linear conductor 96 that connects the flat plate conductor 95B and the connection conductor 14B.

The flat conductor 93A is a substantially rectangular conductor, and is formed on the back surface of the element body 82A. The flat conductor 93B is substantially rectangular like the flat conductor 93A, and is formed on the upper surface of the element body 82A so as to partially face the flat conductor 93A. The flat conductor 95A is a substantially rectangular conductor, and is formed on the upper surface of the element body 82A. Further, the flat conductor 95B is substantially rectangular like the flat conductor 95A, and is formed on the back surface of the element body 82A so as to partially face the flat conductor 95A.
The flat conductors 93B and 95A are formed so as not to contact each other.

  The flat conductors 93A and 95B are connected to both ends of the conductor pattern via straight conductors 94 and 96, respectively. Further, the flat conductors 93B and 95A are connected to the center of the conductor pattern 12 through through-holes formed so as to penetrate the element bodies 82A and 82B, respectively, and filled with a conductive member. As described above, the flat conductors 93A and 93B are arranged to face each other via the element body 82A to form one capacitor, and the flat conductors 95A and 95B are arranged to face each other to form another capacitor.

As shown in FIG. 14, the antenna device 90 includes an antenna portion 97 having a first resonance frequency, and a second resonance frequency by a multi-resonance capacitor portion 91 and a conductor pattern 12 between two points connected thereto. The first double resonance part 98 having the third resonance frequency is formed by the double resonance capacitor part 92 and the conductor pattern 12 between the two points connected thereto.
FIG. 15 shows the VSWR characteristics of the antenna device 90. As shown in the figure, the antenna unit 97 shows the first resonance frequency f11, the first double resonance unit 98 shows the second resonance frequency f12 that is higher than the first resonance frequency f11, and the second double resonance. The part 99 indicates a third resonance frequency f13 having a higher frequency than the second resonance frequency f12. Note that the second resonance frequency can be adjusted by changing the material used for the element body 82A and the opposing areas of the flat conductors 93A and 93B. Similarly, the third resonance frequency can be adjusted by changing the material used for the element body 82A and the opposing areas of the flat conductors 95A and 95B.

  The antenna device 90 configured as described above has the same operations and effects as those of the fifth embodiment described above, but by connecting two double resonance capacitor portions 91 and 92 in parallel at two locations of the conductor pattern 12. A first double resonance part 98 having a second resonance frequency f12 and a second double resonance part 99 having a third resonance frequency f13 are formed. Therefore, for example, a small antenna device having three resonance frequencies such as GSM, DCS, and PCS (Personal Communication Services) can be provided.

  Also in this embodiment, as in the fifth embodiment described above, a meander pattern 87 connected to the land 13A of the loading portion 4 and having a meander shape may be formed.

Next, a seventh embodiment will be described with reference to FIGS. 16 to 18. In the following description, the same reference numerals are given to the components described in the above embodiment, and the description thereof is omitted.
The difference between the seventh embodiment and the sixth embodiment is that in the antenna device 90 in the sixth embodiment, a capacitor is formed by arranging two flat conductors facing each other through an element body 82A. However, the antenna device 100 according to the seventh embodiment is provided with multi-resonance capacitor portions 101 and 102 that form capacitors by stray capacitance generated between the conductor pattern 12.

  That is, as shown in FIG. 16, the multi-resonance capacitor unit 101 includes a flat conductor 103 formed on the upper surface of the element body 82A, and a straight conductor 104 connecting the flat conductor 103 and the connecting conductor 14A. The multi-resonance capacitor unit 102 includes a flat conductor 105 formed on the upper surface of the element body 82A and a straight conductor 106 connecting the flat conductor 105 and the connection conductor 14B.

The flat conductor 103 is a substantially rectangular conductor, and is formed on the upper surface of the element body 82B. The flat conductor 105 is a substantially rectangular conductor, like the flat conductor 103, and is formed on the upper surface of the element body 82B. As described above, the flat conductor 103 and the conductor pattern 12 are arranged to face each other via the element body 82B, so that one capacitor is equivalently formed by the stray capacitance between the flat conductor 103 and the conductor pattern 12. . Similarly, the flat conductor 105 and the conductor pattern 12 are arranged to face each other via the element body 82B, so that another capacitor is equivalently formed by the stray capacitance between the flat conductor 105 and the conductor pattern 12. The
The flat conductors 103 and 105 are formed so as not to contact each other.

In this antenna device 100, as shown in FIG. 17, an antenna unit 106 having a first resonance frequency is formed by a loading unit 4, an inductor unit 5, and a capacitor unit 6, and is connected to the multi-resonance capacitor unit 101. The first double resonance part 107 having the second resonance frequency is formed by the conductor pattern 12 between the two points, and the third resonance frequency is set by the double resonance capacitor part 102 and the conductor pattern 12 between the two points connected thereto. A second double resonance portion 108 is formed.
FIG. 18 shows the VSWR characteristics of the antenna device 100. As shown in the figure, the antenna unit 106 shows a first resonance frequency f21, the first double resonance unit 107 shows a second resonance frequency f22 that is higher than the first resonance frequency f21, and the second double resonance. The part 108 shows a third resonance frequency f23 having a frequency higher than the second resonance frequency f21. It should be noted that the second resonance frequency can be easily changed by adjusting the material used for the element body 82B and the area of the flat conductor 103. Similarly, the third resonance frequency can be easily changed by adjusting the material used for the element body 82A and the area of the flat conductor 105.

  The antenna device 100 configured as described above has the same operations and effects as those of the above-described sixth embodiment. Since the first and second double resonance portions 107 and 108 are formed, the configuration is easy.

  Also in this embodiment, as in the fifth embodiment described above, a meander pattern 87 connected to the land 13A of the loading portion 4 and having a meander shape may be formed.

Next, the antenna device according to the present invention will be specifically described with reference to examples.
As Example 1, the antenna device 1 shown in the first embodiment was manufactured. As shown in FIG. 19, the loading unit 4 of the antenna device 1 is made of alumina and has a rectangular parallelepiped body 11 having a length L5 of 27 mm, a width L6 of 3.0 mm, and a thickness L7 of 1.6 mm. A copper wire having a diameter φ of 0.2 mm is wound as a conductor pattern 12 on the surface so that the center interval W1 is 1.5 mm.

  As Example 2, the antenna device 50 shown in the second embodiment was manufactured. As shown in FIG. 20, the loading unit 51 of the antenna device 50 is made of alumina, and is formed of silver having a width W2 of 0.2 mm on the surface of a rectangular parallelepiped element 11 having a thickness L8 of 1.0 mm. The formed conductor pattern 52 is formed in a meander shape so that the length L9 in the width direction of the element body 11 is 4 mm, the length L10 in the longitudinal direction of the element body 11 is 4 mm, and one period is 12 mm.

The frequency characteristics of the VSWR of the antenna device 1 and the antenna device 50 at frequencies of 400 to 500 MHz are shown in FIGS. 21 and 22, respectively.
As shown in FIG. 21, the antenna device 1 has a frequency of 430 MHz, a VSWR of 1.233, and a bandwidth at VSWR = 2.5 of 18.53 MHz.
As shown in FIG. 22, the antenna device 50 has a frequency of 430 MHz, a VSWR of 1.064, and a bandwidth of 16.62 MHz at VSWR = 2.5.
From these, it was confirmed that the antenna device can be downsized even in a relatively low frequency region such as a 400 MHz band.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, the antenna operating frequency is 430 MHz, but the present invention is not limited to this frequency, and other antenna operating frequencies may be used.
The conductor pattern is not limited to a spiral shape or a meander shape, and may be another shape.

It is a top view which shows the antenna apparatus in the 1st Embodiment of this invention. It is a perspective view which shows the antenna apparatus in the 1st Embodiment of this invention. It is a graph which shows the frequency characteristic of VSWR of the antenna apparatus in the 1st Embodiment of this invention. It is a graph which shows the radiation pattern of the antenna apparatus in the 1st Embodiment of this invention. It is a perspective view which shows the antenna apparatus in the 2nd Embodiment of this invention. It is a perspective view which shows the antenna apparatus in the 3rd Embodiment of this invention. It is a perspective view which shows the antenna apparatus in the 4th Embodiment of this invention. It is a perspective view which shows another form of the antenna device in the 4th Embodiment of this invention. It is a perspective view which shows the antenna device in the 5th Embodiment of this invention. It is an equivalent circuit diagram which shows the antenna apparatus in the 5th Embodiment of this invention. It is a graph which shows the frequency characteristic of VSWR of the antenna device in the 5th Embodiment of this invention. It is a perspective view which shows the antenna apparatus which can apply this invention other than the 5th Embodiment of this invention. It is a perspective view which shows the antenna apparatus in the 6th Embodiment of this invention. It is an equivalent circuit diagram which shows the antenna apparatus in the 6th Embodiment of this invention. It is a graph which shows the frequency characteristic of VSWR of the antenna device in the 6th Embodiment of this invention. It is a perspective view which shows the antenna apparatus in the 7th Embodiment of this invention. It is an equivalent circuit diagram which shows the antenna apparatus in the 7th Embodiment of this invention. It is a graph which shows the frequency characteristic of VSWR of the antenna apparatus in the 7th Embodiment of this invention. (A) which shows the loading part in Example 1 of this invention is a top view, (b) is a front view. (A) which shows the loading part in Example 2 of this invention is a top view, (b) is a front view. It is a graph which shows the frequency characteristic of VSWR of the antenna apparatus in Example 1 of this invention. It is a graph which shows the frequency characteristic of VSWR of the antenna apparatus in Example 2 of this invention.

Explanation of symbols

1, 40, 50, 60, 70, 80, 88, 90, 100 Antenna device 2 Substrate 3 Earth part (conductive film)
3A End side 4, 43, 51 Loading part 5 Inductor part 6 Capacitor part 11 Element body 12, 52 Conductor pattern 42 Chip inductor (lumped constant element)
62 1st plane electrode 63 2nd plane electrode 61 Capacitor part 81, 91, 92, 101, 102 Double resonance capacitor part P Feeding point

Claims (8)

  1. A substrate,
    A conductor film provided on a part of the substrate;
    A loading portion that is provided on the substrate and is formed by a linear conductor pattern formed in the longitudinal direction of an element body made of a dielectric material , and does not self-resonate at an antenna operating frequency ;
    An inductor for connecting one end of the conductor pattern and the conductor film and adjusting the antenna operating frequency ;
    A power supply point provided on the substrate and supplying power to a connection point between the one end of the conductor pattern and the inductor portion;
    The longitudinal direction of the loading portion is arranged so as to be parallel to the edge of the conductor film,
    The antenna device, wherein the other end of the conductor pattern is open.
  2. The antenna device according to claim 1 , wherein the loading unit includes a lumped constant element.
  3. The antenna device according to claim 1 or 2, characterized in that the capacitor unit is connected between the feed point and said connection point.
  4. The antenna device according to claim 3 , wherein the capacitor unit includes a capacitor unit formed of a pair of planar electrodes formed on the element body and facing each other.
  5. 5. The antenna device according to claim 4 , wherein one of the pair of planar electrodes is provided on a surface of the element body so as to be capable of trimming.
  6. Wherein between two different points of the conductor pattern, the antenna device according to any one of claims 1 5, characterized in that multiple resonance capacitor portion is connected in parallel equivalently.
  7. The conductor pattern, the antenna device according to any one of claims 1 6, wherein a wound helical shape in the longitudinal direction of the element body.
  8. The conductor pattern, the antenna device according to any one of claims 1 to 6, characterized in that said a meander shape formed on the surface of the element body.
JP2004302924A 2003-12-25 2004-10-18 Antenna device Active JP4089680B2 (en)

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JP2004302924A JP4089680B2 (en) 2003-12-25 2004-10-18 Antenna device
TW093140610A TWI343671B (en) 2003-12-25 2004-12-24
US10/596,812 US7777677B2 (en) 2003-12-25 2004-12-24 Antenna device and communication apparatus
KR1020067014970A KR100995265B1 (en) 2003-12-25 2004-12-24 Antenna device and communication apparatus
KR1020107018354A KR101007529B1 (en) 2003-12-25 2004-12-24 Antenna device and communication device
EP08160793A EP1978595B1 (en) 2003-12-25 2004-12-24 Antenna device and communication apparatus
AT08160793T AT503287T (en) 2003-12-25 2004-12-24 Antenna device and communication device
CN2012101839804A CN102709687B (en) 2003-12-25 2004-12-24 The antenna device
PCT/JP2004/019337 WO2005064743A1 (en) 2003-12-25 2004-12-24 Antenna device and communication apparatus
CNA2004800420267A CN1926720A (en) 2003-12-25 2004-12-24 Antenna device and communication apparatus
CN2012101829361A CN102683839A (en) 2003-12-25 2004-12-24 The antenna device
EP04807694A EP1703586A4 (en) 2003-12-25 2004-12-24 Antenna device and communication apparatus
DE602004031989T DE602004031989D1 (en) 2003-12-25 2004-12-24 Antenna device and communication device
US12/788,175 US8212731B2 (en) 2003-12-25 2010-05-26 Antenna device and communication apparatus
US12/788,749 US7859471B2 (en) 2003-12-25 2010-05-27 Antenna device and communication apparatus
HK13103308.6A HK1176172A1 (en) 2003-12-25 2013-03-18 Antenna device

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