JP6048229B2 - Antenna device - Google Patents

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. However, there is a problem in that each device is complicated, there is no degree of freedom in 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. It is an object of the present invention to provide an antenna device that can be thinned.

  The present invention employs the following configuration in order to solve the above problems. That is, the antenna device according to the first invention includes an insulating substrate body, and a first element and a second element each formed by patterning a metal foil on the surface of the substrate body, and the first element includes: A power feeding point is provided on the base end side, and a base end is connected to a first extension portion extending toward one side of the substrate body, and a tip end of the first extension portion. A second extending portion extending in a direction orthogonal to the extending portion, a base end connected to the ground, and extending along the first extending portion, and a distal end connected to the second extending portion; A third extending portion, a fourth extending portion extending toward the one side with a base end connected in the middle of the second extending portion, and the one side connected to a distal end of the fourth extending portion. A second extension portion extending along the first extension portion, and the second element is connected to a tip of the second extension portion. A sixth extending portion extending toward the one side; and a seventh extending portion extending from the tip of the sixth extending portion to the opposite side of the fifth extending portion. A capacity adjustment portion protruding toward the base end of the seventh extension portion or the base end of the fifth extension portion facing at least one of the base end of the extension portion and the base end of the seventh extension portion Is formed.

In this antenna device, since the first element and the second element are formed on the surface of the substrate body with the metal foil, the stray capacitance between each element and between the ground and the ground is effectively reduced. By using it, it is possible to make double resonance.
In particular, at least one of the base end of the fifth extension part and the base end of the seventh extension part, the capacity adjustment projecting toward the base end of the seventh extension part or the base end of the fifth extension part facing each other Since the portion is formed, the capacitance between the first element and the second element can be adjusted according to the protruding amount of the capacitance adjusting portion formed in the low impedance portion, and the impedance can be adjusted flexibly. it can. In addition, the resonance frequency mainly obtained by the 1st element and the resonance frequency mainly obtained by the 2nd element by setting between the 5th extension part and the 7th extension part in close coupling by the capacity adjustment part. It is also possible to increase the bandwidth.

An antenna device according to a second aspect of the present invention is the antenna device according to the first aspect, further comprising a third element patterned with a metal foil on the surface of the substrate body, wherein the third element is a base end of the second extending portion. Extending from the distal end of the eighth extension portion along the first extension portion in the direction opposite to the fifth extension portion side. It has the 9th extension part which exists.
That is, since this antenna device includes the third element composed of the eighth extending portion and the ninth extending portion that are patterned with a metal foil on the surface of the substrate body, the resonance obtained mainly by the first element is provided. A resonance frequency different from the frequency and the resonance frequency obtained mainly by the second element can be obtained.
In particular, since the ninth extending portion extends in the direction opposite to the fifth extending portion side, it is possible to increase the bandwidth.

An antenna device according to a third invention is the antenna device according to the first or second invention, wherein an insulating ground substrate different from the substrate main body is patterned with a metal foil on the surface of the ground substrate, and the base end is A ground pattern connected to the ground, wherein the ground substrate is disposed in the vicinity of the seventh extending portion, and the ground pattern has at least a portion extending along the seventh extending portion. It is characterized by that.
That is, in this antenna device, since the ground pattern formed on the ground substrate different from the substrate body has at least a portion extending along the seventh extending portion, Even if there is no space for the substrate body or ground plane in the vicinity, a ground substrate with only the ground pattern is installed separately, so that the ground pattern is placed in a small space between the seventh extension part. Capacity can be generated effectively. In particular, since the ground pattern is along the seventh extending portion, a high-frequency current due to radiation from the seventh extending portion can be efficiently passed to the ground via the ground pattern.
In addition, by setting the ground pattern, the flow of the high-frequency current from the fifth extending portion that extends to the opposite side of the seventh extending portion can be efficiently passed.

An antenna device according to a fourth invention is characterized in that, in any one of the first to third inventions, an antenna element of a dielectric antenna is connected in the middle of 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.
Further, the stray capacitance between the antenna element and the second extension portion does not cause the stray capacitance between the antenna element itself and the ground directly, and the antenna element and the second extension portion having high impedance are provided. Due to the stray capacitance between the two, the high-frequency current to the ground can flow more efficiently through the second extension portion.
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 fifth invention is the antenna device according to any one of the first to fourth inventions, wherein a first passive element is connected to the fourth extending portion or the fifth extending portion, and the sixth extending portion. Alternatively, a second passive element is connected to the seventh extension part, and a third passive element is connected to the third extension part.
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 antenna device according to a sixth aspect of the invention is characterized in that, in the second aspect of the invention, a fourth passive element is connected in the middle of the eighth extending portion or the ninth extending portion.
That is, in this antenna device, since the fourth passive element is connected in the middle of the eighth extending part or the ninth extending part, the resonance frequency obtained mainly by the third element by selecting the fourth passive element is Can be adjusted.

The present invention has the following effects.
According to the antenna device of the present invention, since the first element and the second element, each of which is patterned with a metal foil, are provided on the surface of the substrate body, each stray capacitance between each element and between the ground and By effectively utilizing this, it is possible to achieve double resonance with at least two resonance frequencies.
In particular, at least one of the base end of the fifth extension part and the base end of the seventh extension part, the capacity adjustment projecting toward the base end of the seventh extension part or the base end of the fifth extension part facing each other Since the portion is formed, the capacitance between the first element and the second element can be adjusted according to the protruding amount of the capacitance adjusting portion formed in the low impedance portion, and the impedance can be adjusted flexibly. it can.
In addition, each resonant frequency can be flexibly adjusted by selecting antenna elements and passive elements to be 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 one Embodiment of the antenna device which concerns on this invention, it is a top view which shows the positional relationship of each element. In this embodiment, it is a wiring diagram which shows the main area | regions which contribute to each resonance frequency. In this embodiment, it is a wiring diagram which shows the stray capacitance produced with an antenna apparatus. In this embodiment, they are a perspective view (a), a plan view (b), a front view (c), a bottom view (d), and a rear view (e) showing an antenna element. In an embodiment, it is a graph which shows the VSWR characteristic (voltage standing wave ratio) at the time of making it 3 resonance. In the Example of the antenna device which concerns on this invention, it is a graph which shows the radiation pattern of an antenna device. In the other example in one Embodiment of the antenna apparatus which concerns on this invention, it is a top view which shows the positional relationship of each element.

  Hereinafter, an antenna device according to an embodiment of the present 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 first element 3 that is formed by patterning a metal foil such as a copper foil on the surface of the substrate body 2. A second element 4 and a third element 5 are provided.
In addition, the antenna device 1 includes a ground surface G <b> 1 patterned on a surface of the substrate body 2 with a metal foil such as a copper foil. The ground plane G1 is connected to the ground GND of the device to be mounted.

  The first element 3 is provided with a feeding point FP on the base end side, and extends to one side of the substrate body 2 (in this embodiment, reference numeral 2a in FIG. 1). A base end is connected to the tip of the part E1, the first extension E1, the second extension E2 extending in a direction orthogonal to the first extension E1, and the base is connected to the ground plane G1. In addition, a third extending portion E3 extending along the first extending portion E1 and having a distal end connected to the second extending portion E2, and a base end connected in the middle of the second extending portion E2, the one side 2a A fourth extending portion E4 extending toward the end, and a fifth extending portion E5 connected to the tip of the fourth extending portion E4 and extending along the one side 2a.

  The second element 4 includes a sixth extending part E6 connected to the tip of the second extending part E2 and extending toward the one side 2a, and a fifth extending part E5 from the tip of the sixth extending part E6. And a seventh extending portion E7 extending on the opposite side. That is, the open ends of the first element 3 and the second element 4 face in opposite directions, and the fifth extending portion E5 and the seventh extending portion E7 extend along the one side 2a of the substrate body 2. doing.

The third element 5 includes an eighth extension E8 extending from the base end of the second extension E2 along the fifth extension E5, and a first extension from the tip of the eighth extension E8. It has the 9th extension part E9 extended in the reverse direction to the 5th extension part E5 side along the part E1.
At the base end of the fifth extending portion E5, a capacitance adjusting portion E5a is formed that protrudes toward the base end of the seventh extending portion E7 that faces the fifth extending portion E5.

As described above, each element is formed between the one side 2a of the substrate body 2 and the ground plane G1, and serves as an antenna occupation region.
The fifth extending portion E5, the second extending portion E2, and the eighth extending portion E8 extend in parallel to each other, and the third extending portion E3, the first extending portion E1, and the ninth extending portion. E9 extends parallel to each other. In addition, as for the 6th extension part E6, the base end side is extended in the diagonal direction with respect to the 2nd extension part E2, and the front end side is extended in parallel with the 4th extension part E4.

In the middle of the fifth extending portion E5, an antenna element AT of a dielectric antenna is connected.
A first passive element P1 is connected to the fourth extending portion E4. The first passive element P1 may be connected in the middle of the fifth extending portion E5. Further, the second passive element P2 is connected to the sixth extending part E6. The second passive element P2 may be connected in the middle of the seventh extending portion E7. Furthermore, the third passive element P3 is connected to the third extending portion E3. A fourth passive element P4 is connected to the middle of the ninth extending part E9. Note that the fourth passive element P4 may be connected in the middle of the eighth extending portion E8.

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). In addition, a high frequency circuit is mounted in the area of the ground plane G1.
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.
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.

In addition, the antenna device 1 has an insulating ground substrate 12 different from the substrate body 2 and a pattern formed with a metal foil such as a copper foil on the surface of the ground substrate 12, and the base end is connected to the ground GND. And a ground pattern G2.
The ground substrate 12 is formed of, for example, an insulating film, and the ground pattern G2 is formed by patterning a metal foil such as a copper foil on the insulating film. That is, the ground substrate 12 and the ground pattern G2 are formed of an FPC (flexible printed circuit board) or the like.

  The ground substrate 12 is disposed in the vicinity of the seventh extending portion E7, and the ground pattern G2 extends along the seventh extending portion E7. The base end of the ground pattern G2 and the ground GND are connected by FPC or the like. Further, the tip of the ground pattern G2 may be bent and extended in a direction away from the seventh extending portion E7.

The first element 3, the second element 4, and the third element 5 are spaced apart from each other so that stray capacitance between them and a stray capacitance between the ground plane G 1 and the ground pattern G 2 can be generated. It is extended.
That is, as shown in FIG. 3, the stray capacitance Ca between the fifth extending portion E5 and the ground plane G1, the stray capacitance Cb between the fifth extending portion E5 and the eighth extending portion E8, A stray capacitance Cc between the antenna element AT and the second extending portion E2, a stray capacitance Cd between the second extending portion E2 and the ground plane G1, a capacitance adjusting portion E5a, and a seventh extending portion E7. Stray capacitance Ce between the first extension portion E2, the stray capacitance Cf between the capacitance adjustment portion E5a and the second extension portion E2, the stray capacitance Cg between the seventh extension portion E7 and the ground pattern G2, and the ninth extension. A stray capacitance Ch between the existing portion E9 and the ground plane G1 and a stray capacitance Ci between the seventh extending portion E7 and the ground plane G1 can be generated.

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

In the antenna device 1 according to the present embodiment, as shown in FIG. 5, the first resonance frequency f1, the second resonance frequency f2, and the third resonance frequency f3 are combined in three frequency bands in order from the lowest frequency. Resonated.
The first resonance frequency f1 is determined by the first element 3, the antenna element AT, the first passive element P1, the third passive element P3, the ground pattern G2, and the stray capacitance. The second resonance frequency f2 is determined by the second element 4, the first extending portion E1, the second extending portion E2, the second passive element P2, the third passive element P3, the ground pattern G2, and the stray capacitance. It is determined. Further, the third resonance frequency f3 is determined by the third element 5, the first extending portion E1, the second extending portion E2, the fourth passive element P4, the third passive element P3, and the stray capacitance.

Hereinafter, these resonance frequencies will be described in more detail.
“About the first resonance frequency f1”
The frequency of the first resonance frequency f1 is determined by the first element 3, the antenna element AT, the first passive element P1, the third passive element P3, the ground pattern G2, and the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf. Can be set and adjusted.
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, and Cf.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the first passive element P1.
Thus, the first resonance frequency f1 is adjusted mainly at the portion indicated by the broken line A1 in FIG.

“About the second resonance frequency f2”
The frequency of the second resonance frequency f2 includes the second element 4, the first extending part E1, the second extending part E2, the second passive element P2, the third passive element P3, the ground pattern G2, the stray capacitance Cd, It can be set and adjusted by Ce, Cf, Cg, and Ci.
Further, the impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Cd, Ce, Cf, Cg, and Ci.
Further, the final frequency adjustment can be flexibly performed by selecting the second passive element P2.
In this way, the second resonance frequency f2 is adjusted mainly at the portion of the alternate long and short dash line A2 in FIG.

“About the third resonance frequency f3”
The frequency of the third resonance frequency f3 is the third element 5, the first extending part E1, the second extending part E2, the fourth passive element P4, the third passive element P3, and the stray capacitances Cb, Cc, Ch, Can be set and adjusted by Ci.
Further, the impedance adjustment of the third resonance frequency f3 can be performed by setting each of the stray capacitances Cb, Cc, Ch, and Ci.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the fourth passive element P4.
In this way, the third resonance frequency f3 is adjusted mainly at the portion of the two-dot chain line A3 in FIG.

  The final impedance adjustment at each of the resonance frequencies f1, f2, and f3 can be flexibly performed by controlling the flow of the high-frequency current that flows toward the ground plane G1 by selecting the third passive element P3. . In particular, the combination of the capacitance adjustment unit E5a and the third passive element P3 enables more flexible impedance adjustment.

As described above, the antenna device 1 according to the present embodiment includes the first element 3 and the second element 4 that are each formed by patterning a metal foil on the surface of the substrate body 2. By effectively using each stray capacitance between the surface G1, the ground GND, and the ground pattern G2), it is possible to make multiple resonances.
In particular, since the capacitance adjusting portion E5a protruding toward the proximal end of the opposing seventh extending portion E7 is formed at the proximal end of the fifth extending portion E5, the capacitance adjusting portion formed in the low impedance portion The capacitance between the first element 3 and the second element 4 can be adjusted according to the protruding amount of E5a, and the impedance can be adjusted flexibly.
It should be noted that the resonance frequency f1 obtained mainly by the first element 3 and mainly the second element are set by tightly coupling the fifth extending part E5 and the seventh extending part E7 by the capacity adjusting part E5a. 4 can be made closer to the resonance frequency f2 obtained in step 4, and a wider band can be achieved.

  In addition, since the third element 5 including the eighth extending portion E8 and the ninth extending portion E9 patterned on the surface of the substrate body 2 is provided, the resonance frequency f1 obtained mainly by the first element 3 and A resonance frequency f3 different from the resonance frequency f2 obtained mainly by the second element 4 can be obtained. In particular, since the ninth extending portion E9 extends in the direction opposite to the fifth extending portion E5 side, it is possible to increase the bandwidth.

Moreover, since the ground pattern G2 formed on the ground substrate 12 different from the substrate body 2 has at least a portion extending along the seventh extending portion E7, the seventh extending portion E7 Even if there is no space for arranging the substrate body 2 and the ground plane G1 in the vicinity, the ground pattern G2 is arranged in a small space by separately installing the ground substrate 12 on which only the ground pattern G2 is formed. A capacity can be effectively generated between the portion E7. In particular, since the ground pattern G2 is along the seventh extending portion E7, a high-frequency current due to radiation from the seventh extending portion E7 can efficiently flow to the ground GND via the ground pattern G2. .
In addition, by setting the ground pattern G2, the flow of the high-frequency current from the fifth extending portion E5 extending to the opposite side of the seventh extending portion E7 can be efficiently passed.

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 particular, the stray capacitance between the antenna element AT and the second extending portion E2 does not cause the stray capacitance between the antenna element AT itself and the ground directly, and the antenna element AT and the second impedance having the high impedance are not generated. Due to the stray capacitance between the extending portion E2 and the second extending portion E2, the high-frequency current to the ground plane G1 can be more efficiently passed.

Further, by selecting the antenna element AT and each passive element, it is possible to flexibly adjust each resonance frequency, and it is possible to obtain an antenna device capable of making multiple resonances according to design conditions. 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.
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.

  Next, with respect to an example in which the antenna device of the above embodiment is actually manufactured, the results of measuring the VSWR characteristics (voltage standing wave ratio) and the results of measuring the radiation pattern at each resonance frequency are shown in FIG. This will be described with reference to FIG.

In these measurements, the following passive elements were used.
First passive element P1: Capacitor with C = 0.3 pF Second passive element P2: Inductor with L = 2.2 nH Third passive element P3: Inductor with L = 1.0 nH Fourth passive element P4: L = 1.0 nH Inductor

As can be seen from the measurement results, as shown in Table 1 below, all of the first to third resonance frequencies f1 to f3 have good characteristics.
In Table 1, the frequency band of the first resonance frequency f1 is 1575 MHz, the frequency band of the second resonance frequency f2 is 2440 MHz, and the frequency band of the third resonance frequency f3 is 5200 MHz.

Next, FIG. 6 shows the measurement results of the radiation patterns at the first resonance frequency f1, the second resonance frequency f2, and the third resonance frequency f3 for the antenna device of the above example.
The extending direction from the proximal end of the fifth extending portion E5 to the distal end (the extending direction of the antenna element AT) is defined as the −Y direction, and the extending direction from the proximal end of the first extending portion E1 to the distal end is defined as the −Y direction. The −X direction was used, and the direction perpendicular to the surface of the substrate body 2 was the Z direction. At this time, vertical polarization, horizontal polarization, and power gain with respect to the ZX plane were measured.

  As a result, the average power gain of the first resonance frequency f1 in the ZX plane is −5.9 dBi, the average power gain of the second resonance frequency f2 is −5.0 dBi, and the average of the third resonance frequency f3 The power gain was -4.8 dBi.

  In addition, this invention is not limited to the said embodiment and Example, 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, each element and the ground plane are formed on the board body, but the board body is divided into a portion of the antenna occupation area where each element is formed and a portion where the ground plane is formed. It may be divided and separately installed as separate members, and the third extending portion and the ground surface may be connected to each other by an FPC (flexible printed circuit board) or the like.
In addition, the substrate body includes a substrate such as a printed circuit board on which an antenna element and each passive element are mounted and an element pattern around them is formed, and a fifth extending portion, a seventh extending portion on the tip side from the passive element, Only the region of the ninth extending portion may be divided into a substrate such as an FPC formed, and these may be connected.
In addition, the ground pattern has a portion that is arranged in the vicinity of the seventh extending portion and extends along at least the seventh extending portion, and the tip of the ground pattern extends from the seventh extending portion. You may bend and extend in the direction to separate. Moreover, although the ground pattern is provided on the sixth extension portion side with respect to the seventh extension portion, it may be provided on the opposite side to the sixth extension portion side.

Furthermore, although the fifth extending portion extends in the direction along the second extending portion as a whole, only the tip may be bent toward the eighth extending portion side (ground surface side).
Moreover, in the said embodiment, although the antenna element was provided in the 5th extension part of the 1st element, the antenna element was provided in the 7th extension part of the 2nd element, and the 9th extension part of the 3rd element. The element may be shortened to reduce the size of the entire apparatus.

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.

  Moreover, in the said embodiment, although the capacity | capacitance adjustment part E5a is formed in the base end of the 5th extension part E5, 7th like the antenna apparatus 21 shown in FIG. 7 as another example of the said embodiment. You may further form the capacity | capacitance adjustment part E7a which protrudes toward the base end of the 5th extension part E5 which opposes from the base end of the extension part E7. That is, in this antenna device 21, the mutual space is determined by the amount of protrusion between the capacitance adjusting unit E5a and the capacitance adjusting unit E7a facing each other, and the stray capacitance is adjusted. Note that the capacity adjusting portion of the present invention includes the base end of the seventh extension portion E7 or the fifth extension facing at least one of the base end of the fifth extension portion E5 and the base end of the seventh extension portion E7. It suffices if it is formed so as to protrude toward the base end of the part E5, and when only the capacity adjusting part E5a or only the capacity adjusting part E7a is formed, or when both are formed as in the above other examples It doesn't matter.

  DESCRIPTION OF SYMBOLS 1 ... Antenna device, 2 ... Board | substrate main body, 2a ... One side of board | substrate main body, 3 ... 1st element, 4 ... 2nd element, 5 ... 3rd element, AT ... Antenna element, E1 ... 1st extension part, E2 ... 2nd extension part, E3 ... 3rd extension part, E4 ... 4th extension part, E5 ... 5th extension part, E5a, E7a ... Capacity adjustment part, E6 ... 6th extension part, E7 ... 7th Extension part, E8 ... Eighth extension part, E9 ... Ninth extension part, G1 ... Ground plane, G2 ... Ground pattern, GND ... Ground, P1 ... First passive element, P2 ... Second passive element, P3 ... 3rd passive element, P4 ... 4th passive element, FP ... Feeding point

Claims (6)

An insulating substrate body, and a first element and a second element each of which is patterned with a metal foil on the surface of the substrate body,
The first element is provided with a feeding point on the proximal end side and extends toward one side of the substrate body, and a proximal end at the distal end of the first extension portion Are connected to each other and extend in a direction perpendicular to the first extension, and a base end is connected to the ground and extends along the first extension. A third extending portion having a distal end connected to the portion, a fourth extending portion having a proximal end connected in the middle of the second extending portion and extending toward the one side, and a fourth extending portion A fifth extension part connected to the tip and extending along the one side;
The second element is connected to the distal end of the second extending portion and extends toward the one side, and the sixth extending portion is opposite to the fifth extending portion from the distal end of the sixth extending portion. And a seventh extending portion extending to
At least one of the base end of the fifth extension portion and the base end of the seventh extension portion protrudes toward the base end of the seventh extension portion or the base end of the fifth extension portion facing each other. An antenna device characterized in that a capacity adjustment section is formed. The antenna device according to claim 1,
Comprising a third element patterned with a metal foil on the surface of the substrate body;
The third element includes an eighth extension extending from the base end of the second extension along the fifth extension, and the first extension from the tip of the eighth extension. And a ninth extending portion extending in the opposite direction to the fifth extending portion side. In the antenna device according to claim 1 or 2,
An insulating ground substrate different from the substrate body;
A ground pattern in which the base end is connected to the ground by patterning with a metal foil on the surface of the ground substrate,
The ground substrate is disposed in the vicinity of the seventh extending portion;
The antenna device, wherein the ground pattern has a portion extending along at least the seventh extending portion. In the antenna device according to any one of claims 1 to 3,
An antenna device, wherein an antenna element of a dielectric antenna is connected in the middle of the fifth extending portion. In the antenna device according to any one of claims 1 to 4,
A first passive element is connected to the fourth extension part or the fifth extension part,
A second passive element is connected to the sixth extending portion or the seventh extending portion;
An antenna device, wherein a third passive element is connected to the third extending portion. The antenna device according to claim 2, wherein
A fourth passive element is connected in the middle of the eighth extending portion or the ninth extending portion.