JP2016192655A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device capable of flexibly adjusting each resonance frequency which is doubly resonated.SOLUTION: An antenna device includes: a substrate body 2; and a ground surface GND and first to fourth elements 3 to 6 pattern-formed on at least one of the surface and the rear face of the substrate body. The first element has: a first extension part E1; a second extension part E2; a third extension part E3; and a fourth extension part E4. The second element is extended from the middle of the second extension part to the ground surface. The first element has a phase adjustment part Ph annularly formed of the tip end side of the first extension part, the base end side of the second extension part, the third extension part, and the fourth extension part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an antenna device capable of making multiple resonances.

2. Description of the Related Art Conventionally, in communication equipment, an antenna device using a radiation electrode and a dielectric block, an antenna device using a switch, and a control voltage source has been proposed to make the resonance frequency of the antenna double resonant.
For example, as a conventional technique using a dielectric block, Patent Document 1 proposes a composite antenna that achieves high efficiency by forming a radiation electrode on a resin molded body and further integrating the dielectric block with an adhesive. .

  Further, as a conventional technique using a switch and a control voltage source, in Patent Document 2, a first radiation electrode, a second radiation electrode, a middle portion of the first radiation electrode, and a base of the second radiation electrode are disclosed. An antenna device has been proposed that includes a switch that is interposed between the end portion and electrically connects or disconnects the second radiation electrode with the first radiation electrode.

JP 2010-81000 A JP 2010-166287 A

However, the following problems remain in the above-described conventional technology.
That is, in the technique using the dielectric block as described in Patent Document 1, a dielectric block that excites the radiation electrode is used, and it is necessary to design the dielectric block, the radiation electrode pattern, etc. for each device. Depending on design conditions, antenna performance may be degraded, and unstable elements may increase. In addition, since the radiation electrode is formed on the surface of the resin molding, it is necessary to design the radiation electrode pattern on the resin molding. Depending on the communication equipment to be mounted and its application, the antenna design and mold design This is necessary and causes a significant increase in cost. Furthermore, since the dielectric block and the molded resin are integrated with an adhesive, the antenna performance may be degraded or unstable depending on the adhesive conditions (adhesive thickness, adhesive area, etc.) in addition to the adhesive Q value. There is a disadvantage that the number of elements increases.
In addition, in the case of an antenna device using a switch and a control voltage source as described in Patent Document 2, a configuration of a control voltage source, a reactance circuit, and the like are required to switch the resonance frequency with the switch, and the antenna configuration is a device There is a problem that it is complicated every time, there is no freedom of design, and easy antenna adjustment is difficult.

  The present invention has been made in view of the above-mentioned problems, and can flexibly adjust each resonance frequency that has been double-resonated, and can easily and inexpensively ensure antenna performance according to the application and equipment, and can be downsized and thin. An object of the present invention is to provide an antenna device that can be configured.

  The present invention employs the following configuration in order to solve the above problems. That is, an antenna device according to a first invention includes an insulating substrate body, a ground surface patterned with metal foil on at least one of a front surface and a back surface of the substrate body, a first element, and a second element, respectively. The first element is provided with a feeding point on a proximal end side close to the ground surface, and extends in a direction away from the ground surface; and A proximal end side connected to the distal end and extending in a direction orthogonal to the first extending portion; and extending in a direction orthogonal to the first extending portion from the middle of the first extending portion A third extending portion, and a fourth extending portion extending from the distal end of the third extending portion to the proximal end side of the second extending portion along the first extending portion, The second element extends from the middle of the second extending portion to the ground surface, and the second element The element has a phase adjustment portion formed in an annular shape by the distal end side of the first extension portion, the proximal end side of the second extension portion, the third extension portion, and the fourth extension portion. It is characterized by being.

In this antenna device, since at least one of the front surface and the back surface of the substrate main body is provided with the ground surface, the first element, and the second element, each of which is patterned with a metal foil, between each element and the ground surface It is possible to make multiple resonances by effectively using each stray capacitance between them.
In particular, since the second element extends from the middle of the second extending portion to the ground surface, the first extending portion, the second extending portion, the second element, and the ground surface are formed in this order from the feeding point. The high-frequency current loop path is formed, and a resonance frequency different from the resonance frequency obtained mainly by the first element can be obtained. In addition, the first element has a phase adjusting portion formed in an annular shape by the distal end side of the first extending portion, the proximal end side of the second extending portion, the third extending portion, and the fourth extending portion. Therefore, the effect of partially overlapping the resonance frequency band obtained mainly by the first element and the resonance frequency band obtained mainly by the second element adjacent to each other can be obtained. That is, the path of the high-frequency current from the feeding point is connected to the second extension part via the path from the first extension part to the second extension part and the third extension part to the fourth extension part. It is divided into paths, and these paths are combined in the middle of the second extending portion, whereby the bandwidth of the resonance frequency can be widened. Further, the resonance frequency obtained mainly in the first element and the second element mainly are obtained by the stray capacitance generated in the phase adjustment unit and the stray capacitance generated between the first extension part and the second element. It is possible to obtain an effect of overlapping adjacent portions that are generated in opposite phases to the resonance frequency.

An antenna device according to a second invention is the antenna device according to the first invention, further comprising a third element patterned with a metal foil on at least one of a front surface and a back surface of the substrate body, wherein the third element is the second element. A fifth extension extending from the base end of the extension to the opposite side of the second extension; and a sixth extension extending from the fifth extension in a direction away from the ground surface. And a seventh extension part extending from the tip of the sixth extension part along the second extension part toward the tip side of the second extension part, To do.
In this antenna device, since the third element patterned with the metal foil is provided on at least one of the front surface and the back surface of the substrate body, the stray capacitance between the seventh extension portion and the second extension portion is provided. And a resonance frequency different from the resonance frequency mainly obtained by the first element and the resonance frequency mainly obtained by the second element due to the stray capacitance between the seventh extension part and the fifth extension part. Can be obtained.

In the antenna device according to a third aspect of the present invention, in the second aspect of the present invention, a capacitance adjusting portion that is widened toward the seventh extending portion is formed on the proximal end side of the second extending portion. It is characterized by.
That is, in this antenna device, since the capacitance adjusting portion having a width that increases toward the seventh extending portion is formed on the base end side of the second extending portion, the distal end side of the second extending portion and the second extending portion are arranged. The coupling between the first element and the third element changes mainly due to the difference between the stray capacitance between the seventh extension part and the stray capacitance between the capacity adjustment part and the seventh extension part. It is possible to widen the resonance frequency obtained by the third element.

An antenna device according to a fourth invention is the antenna device according to the second or third invention, comprising a fourth element patterned with a metal foil on at least one of the front surface and the back surface of the substrate body, wherein the fourth element is: It extends from the front-end | tip of the said 3rd extension part toward the opposite side to the front end side of the said 2nd extension part, It is characterized by the above-mentioned.
That is, in this antenna device, since the fourth element patterned with the metal foil is provided on at least one of the front surface and the back surface of the substrate body, the stray capacitance is provided between the fourth element and the fifth extending portion. The resonance frequency obtained mainly by the first element, the resonance frequency obtained mainly by the second element, and the resonance frequency obtained mainly by the third element can be obtained.

An antenna device according to a fifth invention is characterized in that, in the fourth invention, a wide portion wider than the base end side is formed at a distal end portion of the fifth extending portion.
That is, in this antenna device, since the wide portion wider than the base end side is formed at the distal end portion of the fifth extending portion, the impedance from the wide portion to the distal end side can be increased, and the wide portion The impedance can be adjusted by increasing the stray capacitance between the first element and the fourth element.

The antenna device according to a sixth aspect of the present invention is the antenna device according to the fourth or fifth aspect, wherein the fourth element extends from the tip of the third extending portion to the side opposite to the third extending portion. Along the fifth extending portion from the distal end of the ninth extending portion, and the ninth extending portion extending from the distal end of the eighth extending portion toward the fifth extending portion. A tenth extending portion extending toward the opposite side to the tip side of the second extending portion is provided.
That is, in this antenna device, since the fourth element has the tenth extending portion from the eighth extending portion, the ninth extending portion serves as a rising portion of the fourth element. As the existing portion becomes closer to the fifth extending portion, the stray capacitance between the tenth extending portion and the fifth extending portion increases. As a result, it is possible to increase the gain at the resonance frequency obtained mainly by the fourth element, and to establish the stray capacitance between the eighth extension part and the fifth extension part, and the tenth extension part. Impedance can be adjusted by generating at least two stray capacitances between the fifth extension and the stray capacitance.

In the antenna device according to a seventh aspect of the present invention, in any one of the fourth to sixth aspects, the fourth element protrudes and extends longer than the fifth extending portion.
That is, in this antenna device, since the fourth element extends longer than the fifth extending portion, the open end of the fourth element is separated from the fifth extending portion and the fifth extending portion. As a result, the impedance can be increased and the stray capacitance between the fourth element and the ground plane can be increased.

An antenna device according to an eighth invention is characterized in that, in any one of the second to seventh inventions, an antenna element of a dielectric antenna is connected to the fifth extending portion.
That is, in this antenna device, the element length of the loading element that does not self-resonate at a desired resonance frequency can be shortened, the impedance can be increased, and the stray capacitance can be increased. In addition, the size and the antenna characteristics can be improved.
In addition, it is possible to design in the plane of the substrate body, and it is possible to reduce the thickness compared to the case of using a conventional dielectric block or resin molded body, and by selecting an antenna element that is a dielectric antenna, Miniaturization and high performance are possible. Further, there is no need for costs due to molds, design changes, etc., and low costs can be realized.

An antenna device according to a ninth invention is the antenna device according to any one of the first to eighth inventions, wherein a first passive element is connected to the first extending portion, and a second passive element is connected to the second element. It is characterized by being.
That is, in this antenna device, each resonance frequency can be flexibly adjusted by selecting each passive element, and an antenna device capable of making multiple resonances according to design conditions can be obtained. Thus, since each resonance frequency can be flexibly adjusted in terms of the antenna configuration, the resonance frequency can be switched, and the adjustment location by a passive element or the like can be changed according to the application or device.

The present invention has the following effects.
According to the antenna device of the present invention, since at least one of the front surface and the back surface of the substrate main body includes the ground surface, the first element, and the second element that are patterned with the metal foil, A stray capacitance is generated between the ground plane and the like, and a double resonance can be achieved with at least two resonance frequencies.
In particular, since the second element extends from the middle of the second extending portion to the ground surface, a resonance frequency different from the resonance frequency obtained mainly by the first element can be obtained, and the first Since the element has a phase adjusting portion formed in an annular shape by the distal end side of the first extending portion, the proximal end side of the second extending portion, the third extending portion, and the fourth extending portion, In addition, it is possible to obtain an effect of overlapping adjacent portions generated in opposite phases of the resonance frequency obtained from the first element and the resonance frequency obtained mainly from the second element.
In addition, each resonant frequency can be flexibly adjusted by selecting the antenna element and passive element connected to the element, so that multiple resonance can be achieved according to design conditions, and miniaturization and high performance can be achieved. .
Therefore, the antenna device of the present invention can easily achieve multiple resonances corresponding to various applications and devices, and can save space.

In 1st Embodiment of the antenna device which concerns on this invention, it is a top view which shows the positional relationship of each element. In 1st Embodiment, it is a wiring diagram which shows the main area | regions which contribute to each resonance frequency. FIG. 3 is a wiring diagram showing stray capacitance generated in the antenna device in the first embodiment. In 1st Embodiment, it is a perspective view (a) which shows an antenna element, a top view (b), a front view (c), and a bottom view (d). In 1st Embodiment, it is a graph which shows the VSWR characteristic (voltage standing wave ratio) at the time of making it 4 resonance. In 2nd Embodiment of the antenna apparatus which concerns on this invention, it is an exploded top view which shows the positional relationship of each element.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an antenna device according to a first embodiment of the invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the antenna device 1 according to the present embodiment includes an insulating substrate body 2 and a ground surface GND that is patterned on a surface of the substrate body 2 with a metal foil such as a copper foil. The first element 3, the second element 4, the third element 5, and the fourth element 6 are provided.

  The first element 3 includes a first extending portion E1 provided with a feeding point FP on the base end side close to the ground surface GND and extending in a direction away from the ground surface GND, and a first extending portion E1. A proximal end side is connected to the distal end and the second extending portion E2 extends in a direction orthogonal to the first extending portion E1, and extends in the direction orthogonal to the first extending portion E1 from the middle of the first extending portion E1. A third extending portion E3, and a fourth extending portion E4 extending from the distal end of the third extending portion E3 to the proximal end side of the second extending portion E2 along the first extending portion E1. Have.

  The first element 3 is formed in an annular shape by the distal end side of the first extending portion E1, the proximal end side of the second extending portion E2, the third extending portion E3, and the fourth extending portion E4. Part Ph. That is, in this embodiment, from the connection part of the third extension part E3 in the first extension part E1 to the distal end, and from the connection part of the first extension part E1 to the proximal end in the second extension part E2, The 4th extension part E4 by which the front-end | tip was connected to the base end of the 2nd extension part E2, and the front-end | tip was connected to the base end of the 4th extension part E4, and the base end was connected to the 1st extension part E1. A quadrangular annular phase adjusting portion Ph is formed by the third extending portion E3.

  Note that the direction orthogonal to the first extending portion E1 is a direction along the end side of the ground surface GND facing the base end portion of the first extending portion E1, and the substrate body 2 facing this end side It is also a direction along one side. The direction away from the ground plane GND is the direction toward the one side of the substrate body 2.

The second element 4 extends from the middle of the second extending portion E2 to the ground plane GND. That is, the second element 4 extends along the first extending portion E1.
The third element 5 includes a fifth extending portion E5 extending from the base end of the second extending portion E2 to the opposite side of the second extending portion E2, and a distance from the ground surface GND from the fifth extending portion E5. A sixth extension portion E6 extending in the direction to be extended, and a seventh extension extending from the tip end of the sixth extension portion E6 toward the tip end side of the second extension portion E2 along the second extension portion E2. And E7.
That is, the third element 5 has a shape that is folded back in an inverted U shape.

On the base end side of the second extending portion E2, a capacity adjusting portion E2a that is widened toward the seventh extending portion E7 is formed.
A wide portion E5a wider than the base end side is formed at the distal end of the fifth extending portion E5.

The fourth element 6 extends from the tip end of the third extending portion E3 toward the side opposite to the tip end side of the second extending portion E2.
The fourth element 6 includes an eighth extending portion E8 extending from the tip of the third extending portion E3 to the opposite side of the third extending portion E3, and a fifth extending from the tip of the eighth extending portion E8. A ninth extending portion E9 extending toward the portion E5, and extending from the distal end of the ninth extending portion E9 toward the opposite side of the distal end side of the second extending portion E2 along the fifth extending portion E5. And a tenth extending portion E10.
That is, the fourth element 6 is formed in a crank shape.
Furthermore, the fourth element 6 protrudes and extends longer than the fifth extending portion E5. That is, the tip end side of the tenth extending portion E10 extends beyond the fifth extending portion E5.

An antenna element AT of a dielectric antenna is connected to the fifth extending portion E5.
A first passive element P1 is connected to the first extending portion E1 on the way, and a second passive element P2 is connected to the second element 4 on the way.
The first element 3 includes a first ground pattern G1 having a proximal end connected to the distal end side with respect to the first passive element P1 of the first extending portion E1 and the other end connected to the ground surface GND, and a first extending portion E1. It has a second ground pattern G2 having a proximal end connected to the proximal end side of the first passive element P1 in the existing portion E1 and the other end connected to the ground plane GND.
A third passive element P3 is connected to the first ground pattern G1, and a fourth passive element P4 is connected to the second ground pattern G2. Thus, the first passive element P1, the third passive element P3, and the fourth passive element P4 constitute a π-type impedance adjustment circuit.

The board body 2 is a general printed board, and in the present embodiment, a printed board made of glass epoxy resin or the like is employed.
The feed point FP is connected to a feed point of a high frequency circuit (not shown). For example, a core wire of a coaxial cable (not shown) connected to a high-frequency circuit is connected to the feed point FP, and the ground wire of the coaxial cable is connected to a nearby ground plane GND. A high frequency circuit is mounted in the area of the ground plane GND.
For example, an inductor, a capacitor, a resistor, or a jumper line is used as each passive element.

The antenna element AT is a loading element that does not self-resonate at a desired resonance frequency, and is a chip antenna in which a conductor pattern 122 such as Ag is formed on the surface of a dielectric 121 such as ceramic as shown in FIG. is there. Both end portions of the conductor pattern 122 are connected to opposite ends of the divided portion of the fifth extending portion E5 for mounting, so that the antenna element AT becomes a part of the fifth extending portion E5.
As the antenna element AT, elements having different lengths, widths, conductor patterns, and the like may be selected according to the setting of the resonance frequency and the like. Depending on the desired frequency, the dielectric 121 used in the antenna element AT may be a magnetic material or a composite material in which a dielectric and a magnetic material are mixed.

The first element 3, the second element 4, the third element 5, and the fourth element 6 are spaced apart from each other so as to generate a stray capacitance between them and a stray capacitance between the ground plane GND. It is extended.
That is, as shown in FIG. 3, the stray capacitance Ca between the second extending portion E2 and the seventh extending portion E7, and the stray capacitance Cb between the capacitance adjusting portion E2a and the seventh extending portion E7, The stray capacitance Cc between the antenna element AT and the seventh extension E7, the stray capacitance Cd between the antenna element AT and the tenth extension E10, the third extension E3, and the second extension The stray capacitance Ce between the portion E2 (the stray capacitance in the phase adjustment portion Ph), the stray capacitance Cf between the wide portion E5a and the tenth extending portion E10, the first extending portion E1, and the second element 4, the stray capacitance Ch between the tip end side of the second extension portion E2 and the ground plane GND, and the tip end side of the fourth extension portion E4 and the first extension portion E1. Stray capacitance Ci between them (stray capacitance in the phase adjustment portion Ph), stray capacitance Cj between the eighth extending portion E8 and the antenna element AT, and the first A floating capacitance Ck between the extending portion E10 and the ground plane GND can be generated.

  Next, each resonance frequency in the antenna device of the present embodiment will be described with reference to FIG.

  In the antenna device 1 of the present embodiment, as shown in FIG. 5, the first resonance frequency f1, the second resonance frequency f2, the third resonance frequency f3, and the fourth resonance frequency f4 from the lowest frequency. In order, double resonance is realized in four frequency bands.

Hereinafter, these resonance frequencies will be described in detail.
“About the first resonance frequency f1”
The frequency of the first resonance frequency f1 is the third element 5, the antenna element AT, the first extending portion E1, the second extending portion E2, and the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf, Cg, It can be set and adjusted with Ce.
Further, the impedance adjustment of the first resonance frequency f1 can be performed by setting each of the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf, Cg, and Ce.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the first passive element P1.
The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing to the first ground pattern G1 and the ground plane GND side by selecting the second passive element P2 and the third passive element P3. Is possible.
In this way, the first resonance frequency f1 is adjusted mainly at the portion of the one-dot chain line A1 in FIG.

“About the second resonance frequency f2”
The frequency of the second resonance frequency f2 can be set and adjusted by the first element 3, the second element 4, and the stray capacitances Ca, Cb, Ce, Cg, Ch.
Moreover, the impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Ca, Cb, Ce, Cg, and Ch.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the first passive element P1.
The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing on the ground plane GND side by selecting the second passive element P2.
Thus, the second resonance frequency f2 is adjusted mainly at the portion indicated by the broken line A2 in FIG.

“About the third resonance frequency f3”
The frequency of the third resonance frequency f3 is an intermediate portion between the first extending portion E1 and the second extending portion E2 (between the connecting portion of the first extending portion E1 and the connecting portion of the second element 4). It can be set and adjusted by the second element 4 and the stray capacitances Ca, Cb, Ci, Cg.
Further, the impedance adjustment of the third resonance frequency f3 can be performed by setting each of the stray capacitances Ca, Cb, Ci, Cg.
Further, the final frequency adjustment can be flexibly performed by selecting the second passive element P2.
The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing to the first ground pattern G1 and the ground plane GND side by selecting the third passive element P3.
In this way, the third resonance frequency f3 is adjusted mainly at the portion of the two-dot chain line A3 in FIG.

“About the fourth resonance frequency f4”
The frequency of the fourth resonance frequency f4 is an intermediate portion between the fourth element 6, the first extending portion E1, and the second extending portion E2 (the connecting portion of the first extending portion E1 and the connecting portion of the second element 4). And the third extension portion E3, the fourth extension portion E4, the second element 4, and the stray capacitances Cd, Ce, Cf, Cg, Cj, Ck.
The impedance adjustment of the fourth resonance frequency f4 can be performed by setting each of the stray capacitances Cd, Ce, Cf, Cg, Cj, and Ck.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the first passive element P1.
The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing on the first ground pattern G2 and the ground plane GND side by selecting the fourth passive element P4.
In this way, the fourth resonance frequency f4 is adjusted mainly at the portion indicated by the dotted line A4 in FIG.

  As described above, in the antenna device 1 according to the present embodiment, the ground surface GND, the first element 3, the second element 4, the third element 5, and the fourth pattern each formed by patterning the metal foil on the surface of the substrate body 2. Since the element 6 is provided, multiple resonances can be achieved by effectively using the stray capacitance between the elements and the ground plane GND.

  In particular, since the second element 4 extends from the middle of the second extending portion E2 to the ground plane GND, the first extending portion E1, the second extending portion E2, the second element 4 from the feeding point FP. In addition, a loop path of a high-frequency current formed in the order of the ground plane GND is formed, and a resonance frequency different from the resonance frequency obtained mainly by the first element 3 can be obtained. Further, the first element 3 is formed in an annular shape by the distal end side of the first extending portion E1, the proximal end side of the second extending portion E2, the third extending portion E3, and the fourth extending portion E4. Since the portion Ph is provided, the effect of partially overlapping the band of the resonance frequency f2 obtained mainly by the first element 3 and the band of the resonance frequency f3 obtained mainly by the second element 4 adjacent to each other is obtained. be able to.

  That is, the path of the high-frequency current from the feeding point FP is the second via the path from the first extending part E1 to the second extending part E2 and the third extending part E3 via the fourth extending part E4. It is divided into paths connected to the extending part E2, and these paths are combined in the middle of the second extending part E2, whereby the bandwidth of the resonance frequency can be widened. In addition, the resonance frequency f2 obtained mainly by the first element 3 by the stray capacitance Ci generated in the phase adjusting portion Ph and the stray capacitance Cg generated between the first extension portion E1 and the second element 4; It is possible to obtain an effect of overlapping adjacent portions that are generated in opposite phases with respect to the resonance frequency f3 obtained mainly by the second element 4.

  In addition, since the third element 5 patterned with a metal foil is provided on the surface of the substrate body 2, stray capacitances Ca and Cb between the seventh extending portion E7 and the second extending portion E2 and The resonance frequency f2 obtained mainly in the first element 3 by the stray capacitance Cc between the seventh extension part E7 and the fifth extension part E5 (including the antenna element AT), and mainly the second element A resonance frequency f1 different from the resonance frequency f3 obtained in 4 can be obtained.

  In addition, since the capacity adjustment portion E2a that is widened toward the seventh extension portion E7 is formed on the base end side of the second extension portion E2, the distal end side of the second extension portion E2 and the seventh extension portion E2 are formed. The coupling between the first element 3 and the third element 5 is caused by a difference between the stray capacitance Ca between the extension portion E7 and the stray capacitance Cb between the capacitance adjustment portion E2a and the seventh extension portion E7. By changing the degree, the resonance frequency f1 obtained mainly by the third element 5 can be broadened.

  Further, since the fourth element 6 patterned with a metal foil is provided on the surface of the substrate body 2, stray capacitances Cd, Cf, Cj are provided between the fourth element 6 and the fifth extending portion E5. A resonance frequency f4 that is generated and is different from the resonance frequency f2 obtained mainly by the first element 3, the resonance frequency f3 obtained mainly by the second element 4, and the resonance frequency f1 obtained mainly by the third element 5. Can be obtained.

Moreover, since the wide part E5a wider than the base end side is formed in the front-end | tip part of the 5th extension part E5, while the impedance of the front end side can be made high from the wide part E5a, wide part E5a and Impedance can be adjusted by increasing the stray capacitance Cf between the fourth element 6 and the fourth element 6.
Further, since the fourth element 6 has the eighth extending portion E8 to the tenth extending portion E10, the ninth extending portion E9 serves as a rising portion of the fourth element 6 and extends the tenth extension. As the portion E10 becomes closer to the fifth extending portion E5, the stray capacitances Cd and Cf between the tenth extending portion E10 and the fifth extending portion E5 increase. As a result, it is possible to increase the gain at the resonance frequency f4 obtained mainly by the fourth element 6, and to stray capacitance between the eighth extending portion E8 and the antenna element AT of the fifth extending portion E5. Cj, a stray capacitance Cd between the tenth extending portion E10 and the antenna element AT of the fifth extending portion E5, and a stray capacitance Cf between the tenth extending portion E10 and the wide portion E5a. Impedance can be adjusted by generating stray capacitance.

  Further, since the fourth element 6 extends longer than the fifth extending portion E5, the open end of the fourth element 6 is separated from the fifth extending portion E5, and the fifth extending portion E5 and The influence of the stray capacitance generated between the fourth element 6 and the ground plane GND can be increased, and the stray capacitance Ck between the fourth element 6 and the ground plane GND can be increased.

In addition, the antenna element AT, which is a loading element that does not self-resonate at a desired resonance frequency, can shorten the element length, increase the impedance, and increase the stray capacitance. It is possible to improve the antenna characteristics.
In addition, the design can be made in the plane of the substrate body 2, and the thickness can be reduced as compared with the case where a conventional dielectric block or resin molding is used, and the antenna element AT which is a dielectric antenna is selected. Thus, miniaturization and high performance can be achieved. Further, there is no need for costs due to molds, design changes, etc., and low costs can be realized.

  Furthermore, by selecting each passive element, each resonance frequency can be adjusted flexibly, and an antenna device capable of making multiple resonances according to design conditions can be obtained. Thus, since each resonance frequency can be flexibly adjusted in terms of the antenna configuration, the resonance frequency can be switched, and the adjustment location by a passive element or the like can be changed according to the application or device.

  Next, a second embodiment of the antenna device according to the present invention will be described below with reference to FIG. Note that, in the following description of the embodiment, the same components described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, each element such as the ground plane GND, the first element 3 to the fourth element 6 is provided on one substrate body 2. On the other hand, in the antenna device 21 of the second embodiment, as shown in FIG. 6, the substrate body has a ground surface GND, a base end side of the first extending portion E1, a first ground pattern G1, and a second ground. The ground side substrate 2A having the pattern G2 and the base end side of the second element 4, the leading end side of the first extending portion E1, the leading end side of the second element 4, the second extending portion E2 to the tenth extending portion E10. And the element side substrate 2B.

Moreover, in 2nd Embodiment, the base end side of the 2nd element 4 and the front end side of the 2nd element 4 are electrically connected via the electroconductive member 22a. That is, the first connection point S1 provided on the proximal end side of the second element 4 of the ground side substrate 2A and the second connection point S2 provided on the distal end side of the second element 4 of the element side substrate 2B are: They are connected by a conductive member 22b such as a leaf spring or FPC. Thus, the conductive member 22a functions as a part of the second element 4.
Moreover, the base end side of the 1st extension part E1 and the front end side of the 1st extension part E1 are electrically connected through the electroconductive member 22b. That is, the third connection point S3 provided on the base end side of the first extension portion E1 of the ground side substrate 2A and the fourth connection point provided on the front end side of the first extension portion E1 of the element side substrate 2B. S4 is connected by a conductive member 22b such as a leaf spring or FPC. Thus, the conductive member 22b functions as a part of the first extending portion E1.

  The ground-side substrate 2A can be installed so as to face the ground-side substrate 2A while being connected by the conductive members 22a and 22b. That is, the antenna device 21 can be folded back through the conductive members 22a and 22b. Thereby, the occupation area on a plane can be made smaller than the case where each is installed on the same plane.

The ground side substrate 2A is formed of, for example, a printed circuit board, and the element side substrate 2B is formed of, for example, an FPC (flexible printed circuit board).
Thus, in the antenna device 21 of the second embodiment, the substrate body is divided into the ground side substrate 2A and the element side substrate 2B, so even if there is no space for arranging the ground surface GND, the ground surface GND side By separately installing the ground side substrate 2A separately from the element side substrate 2B, the degree of freedom of installation of the apparatus is greatly improved, and a small space can be accommodated.

  Next, the results of measuring the VSWR characteristics (voltage standing wave ratio) of an example in which the antenna device according to the first embodiment was actually manufactured will be described with reference to FIG.

In these measurements, the following passive elements were used.
First passive element P1: R = 0Ω (jumper wire)
Second passive element P2: L = 4.7 nH inductor Third passive element P3: C = 1.0 pF capacitor Fourth passive element P4: Not mounted

As can be seen from the measurement results, the first to fourth resonance frequencies f1 to f4 are obtained with a good bandwidth as shown in Table 1 below.
The frequency band of the first resonance frequency f1 is the 800 MHz band. The frequency bands of the second resonance frequency f2 and the third resonance frequency f3 are close to each other, and the combined band is the 1900 MHz band. That is, for the second resonance frequency f2 and the third resonance frequency f3, the stray capacitance Ci generated in the phase adjustment unit Ph and the stray capacitance Cg generated between the first extension E1 and the second element 4 Thus, the effect of overlapping adjacent portions generated in opposite phases is obtained. Furthermore, the frequency band of the fourth resonance frequency f4 is the 2600 MHz band.

  In addition, this invention is not limited to said each embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

For example, in each of the above embodiments, the antenna element is provided in the fifth extending part, but the element is shortened by providing the antenna element in the second extending part, the seventh extending part, or the fourth element, The entire device may be downsized. In particular, higher impedance can be achieved by connecting an antenna element to the tenth extension.
Moreover, in each said embodiment, although the passive element was connected to the 1st extension part and the 2nd element, you may connect to another element and extension part. For example, a passive element may be connected in the middle of the second extending portion, the seventh extending portion, the fourth element, or the phase adjusting unit to adjust the impedance or the like.

Further, as described above, it is preferable to connect the antenna element to be a part of the element. However, the fifth extending portion that is extended only by a metal foil such as a copper foil may be used without connecting the antenna element. . At this time, in order to increase the impedance, at least a part of the fifth extending part is formed into a narrow pattern narrower than the other parts, or a meander pattern extending in a certain direction as a whole while zigzag is folded back. It is preferable.
Furthermore, when there is a margin in the substrate size, a part of the element may be replaced with a pattern in which a linear or plate-like metal is folded. Moreover, you may make it the pattern swirled in shapes, such as a spiral shape, using a through hole with respect to the front and back of the same board | substrate body.

  DESCRIPTION OF SYMBOLS 1,21 ... Antenna apparatus, 2 ... Board | substrate main body, 3 ... 1st element, 4 ... 2nd element, 5 ... 3rd element, 6 ... 4th element, AT ... Antenna element, E1 ... 1st extension part, E2 2nd extension part, E2a ... Capacity adjustment part, E3 ... 3rd extension part, E4 ... 4th extension part, E5 ... 5th extension part, E5a ... Wide part, E6 ... 6th extension part, E7: 7th extension part, E8 ... 8th extension part, E9 ... 9th extension part, E10 ... 10th extension part, FP ... Feeding point, G1 ... 1st ground pattern, G2 ... 2nd ground pattern , GND ... ground plane, P1 ... first passive element, P2 ... second passive element, P3 ... third passive element, P4 ... fourth passive element, Ph ... phase adjustment unit

Claims (9)

An insulating substrate body;
At least one of the front surface and the back surface of the substrate body includes a ground surface patterned with a metal foil, a first element, and a second element,
The first element is based on a first extending portion provided with a feeding point on a proximal end side close to the ground surface and extending in a direction away from the ground surface, and on a distal end of the first extending portion. A second extending portion connected to an end side and extending in a direction orthogonal to the first extending portion; and a third extending in a direction orthogonal to the first extending portion from the middle of the first extending portion. An extending portion, and a fourth extending portion extending from the distal end of the third extending portion to the proximal end side of the second extending portion along the first extending portion,
The second element extends from the middle of the second extending portion to the ground plane,
The first element includes a phase adjustment portion formed in an annular shape by a distal end side of the first extension portion, a proximal end side of the second extension portion, the third extension portion, and the fourth extension portion. An antenna device comprising the antenna device. The antenna device according to claim 1,
At least one of the front surface and the back surface of the substrate body includes a third element patterned with a metal foil,
A direction in which the third element is separated from the ground surface from the fifth extending portion, and a fifth extending portion extending from the base end of the second extending portion to the opposite side of the second extending portion. A sixth extension portion extending to the second extension portion, and a seventh extension portion extending from the tip end of the sixth extension portion toward the tip end side of the second extension portion along the second extension portion. An antenna device comprising: The antenna device according to claim 2, wherein
An antenna device, wherein a capacitance adjusting portion having a width that increases toward the seventh extending portion is formed on a proximal end side of the second extending portion. In the antenna device according to claim 2 or 3,
A fourth element patterned with a metal foil is provided on at least one of the front and back surfaces of the substrate body,
The antenna device, wherein the fourth element extends from a tip end of the third extension portion toward a side opposite to a tip end side of the second extension portion. The antenna device according to claim 4, wherein
An antenna device, wherein a wide portion wider than a proximal end side is formed at a distal end portion of the fifth extending portion. In the antenna device according to claim 4 or 5,
The fourth element includes an eighth extension portion extending from the tip of the third extension portion to the opposite side of the third extension portion, and the fifth extension portion from the tip of the eighth extension portion. And a ninth extension portion extending toward the opposite side of the tip end side of the second extension portion along the fifth extension portion from the tip end of the ninth extension portion. An antenna device having 10 extending portions. In the antenna device according to any one of claims 4 to 6,
The antenna device, wherein the fourth element extends longer than the fifth extending portion. In the antenna device according to any one of claims 2 to 7,
An antenna device, wherein an antenna element of a dielectric antenna is connected to the fifth extending portion. In the antenna device according to any one of claims 1 to 8,
A first passive element is connected to the first extension;
An antenna device, wherein a second passive element is connected to the second element.