JP6319572B2 - 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, an antenna device according to a first aspect of the present invention includes an insulating substrate body, a ground surface patterned with metal foil on the surface of the substrate body, a first element, and a second element. The element is provided with a feeding point on the proximal end side close to the ground surface and extends in a direction away from the ground surface, and from the distal end of the first extension portion A second extending portion extending in a direction orthogonal to the first extending portion, and a direction orthogonal to the second extending portion from the tip of the second extending portion and other than the ground plane side And a third extension part extending toward the first extension part, and a fourth extension part extending in a direction perpendicular to the third extension part from the tip of the third extension part, and the second element However, the base end is connected in the middle of the third extending portion, and is opposite to the fourth extending portion. A fifth extending portion extending to the distal end side of the third extending portion along the third extending portion from the distal end of the fifth extending portion, A seventh extending portion extending from the tip of the sixth extending portion to the vicinity of the tip of the third extending portion along the fifth extending portion, and the fifth extending portion and the seventh extending portion. A capacity loading portion is formed between the extending portion and the third extending portion so as to protrude in a direction opposite to the fourth extending portion from the tip of the third extending portion.

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, since a capacity loading portion is formed between the fifth extension portion and the seventh extension portion so as to protrude from the tip of the third extension portion in the direction opposite to the fourth extension portion, A resonance frequency different from the resonance frequency obtained by one element and the resonance frequency obtained mainly by the second element can be obtained. In addition, the stray capacitance obtained between the leading end side of the seventh extending portion, which is high impedance, depending on the protruding amount of the capacity loading portion and the distance between the capacity loading portion and the fifth extending portion or the seventh extending portion, It is possible to adjust the impedance and the bandwidth by controlling the stray capacitance obtained between the base end side of the fifth extension portion close to the feeding point. For example, when the interval between the capacity loading portion and the seventh extension portion is reduced, the impedance can be increased, and when the interval between the capacity loading portion and the fifth extension portion is reduced, the bandwidth can be increased. Furthermore, since the capacity loading portion is in the opposite phase to the first element, interference can be reduced and the bandwidth can be widened.

The antenna device according to a second aspect of the present invention is the antenna device according to the first aspect, wherein the seventh extending portion extends from the distal end of the sixth extending portion along the fifth extending portion to the base end side thereof. An eighth extension part, a ninth extension part extending from the tip of the eighth extension part toward the fifth extension part, and the fifth extension from the tip of the ninth extension part A tenth extending portion extending toward the third extending portion along the portion, and an eleventh extending portion extending in a direction away from the fifth extending portion from the tip of the tenth extending portion. The eleventh extending portion faces the capacity loading portion.
That is, in this antenna device, since the eleventh extending portion faces the capacity loading portion, the resonance frequency is adjusted according to the stray capacitance generated between the eleventh extending portion and the capacity loading portion. Is possible. For example, the resonance frequency becomes lower as the capacity loading portion is closer to the eleventh extension portion. Further, a part of the second element is folded back into a rectangular shape, and the electrical length necessary for the second element can be obtained even if the space is small.

An antenna device according to a third invention is the antenna device according to the first or second invention, comprising a third element patterned with a metal foil on the surface of the substrate body, wherein the third element is the third extension portion. The base end is connected in the middle of the distal end side of each of the first and second ends, and extends in the direction opposite to the fifth extending portion.
That is, in this antenna device, the third element is obtained mainly from the first element because the base end is connected to the middle of the third extending portion and extends in the direction opposite to the fifth extending portion. A resonance frequency different from the resonance frequency obtained from the second element can be obtained.

The antenna device according to a fourth aspect of the present invention is the antenna device according to any one of the first to third aspects, wherein the fourth extending portion is wider at the distal end side than the proximal end side and away from the ground surface. It has a wide part.
That is, in this antenna device, the fourth extending portion has a wide portion wider than the base end side and widened away from the ground surface on the distal end side, so that the pattern of the second element itself is The bandwidth can be widened by the effect of widening and the effect of generating a large stray capacitance between the wide portion and the seventh extending portion.

The antenna device according to a fifth aspect of the present invention is the antenna device according to any one of the first to fourth aspects, wherein the substrate body includes the ground surface, the first extending portion, the second extending portion, and the third extending portion. Divided into a ground side substrate having a base end side of the portion, a tip side of the third extending portion, the fourth extending portion, the second element, and the capacity loading portion, The base end side of the third extension portion and the tip end side of the third extension portion are electrically connected via a conductive member.
That is, in this antenna device, since the substrate body is divided into the ground side substrate and the element side substrate, the ground side substrate on the ground surface side is separated from the element side substrate even when there is no space for arranging the ground surface. By installing separately, the degree of freedom of installation of the device is greatly improved, and it is possible to cope with a small space.

An antenna device according to a sixth invention is characterized in that, in any one of the first to fifth inventions, an antenna element of a dielectric antenna is connected to the second 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, since the antenna element of the dielectric antenna is connected to the second extending portion, the entire element on the tip side of the second extending portion can be shortened, and the device can be reduced in size and the element. Can be made high impedance.
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 seventh invention is characterized in that, in any one of the first to sixth inventions, a passive element is connected to the second extending portion.
That is, in this antenna device, since the passive element is connected to the second extending portion, each resonance frequency can be flexibly adjusted by selecting the passive element, and multiple resonances can be achieved according to the design conditions. An antenna device 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 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 make a double resonance.
In particular, since a capacity loading portion is formed between the fifth extension portion and the seventh extension portion so as to protrude from the tip of the third extension portion in the direction opposite to the fourth extension portion, A resonance frequency different from the resonance frequency obtained by one element and the resonance frequency obtained mainly by the second element can be obtained.
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 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), a bottom view (d), and a rear view (e). 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, a ground surface GND that is patterned on a surface of the substrate body 2 with a metal foil such as a copper foil, 1 element 3, 2nd element 4, and 3rd element 5 are provided.
The first element 3 includes a first extending portion E1 provided with a feeding point FP on the proximal 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 second extending portion E2 extending in a direction orthogonal to the first extending portion E1 from the distal end of the existing portion E1, and a direction orthogonal to the second extending portion E2 from the distal end of the second extending portion E2. A third extending portion E3 extending in a direction other than the ground surface GND side, and a fourth extending portion E4 extending in a direction orthogonal to the third extending portion E3 from the tip of the third extending portion E3. And have.

  The second element 4 includes a fifth extending portion E5 having a base end connected in the middle of the third extending portion E3 and extending in a direction opposite to the fourth extending portion E4, and a fifth extending portion E5. A sixth extending portion E6 extending from the tip end along the third extending portion E3 toward the tip end side of the third extending portion E3, and a tip end of the sixth extending portion E6 along the fifth extending portion E5. It has the 7th extension part E7 extended to the tip vicinity of the 3rd extension part E3.

  In addition, a capacity loading portion E12 is formed between the fifth extending portion E5 and the seventh extending portion E7 so as to protrude from the tip of the third extending portion E3 in the direction opposite to the fourth extending portion E4. Yes. That is, the capacity loading portion E12 is surrounded by the second element 4, and the fifth extending portion E5, the capacity loading portion E12, and the seventh extending portion E7, each formed of a metal foil such as a copper foil, are in this order. Are arranged in parallel with each other from the ground plane GND side.

  Further, the seventh extending portion E7 includes, on its proximal end side, an eighth extending portion E8 extending along the fifth extending portion E5 from the distal end of the sixth extending portion E6, and an eighth extending portion. A ninth extending portion E9 extending from the tip of E8 toward the fifth extending portion E5, and from the tip of the ninth extending portion E9 to the third extending portion E3 side along the fifth extending portion E5 The eleventh extending portion has an extending tenth extending portion E10 and an eleventh extending portion E11 extending in a direction away from the fifth extending portion E5 from the tip of the tenth extending portion E10. E11 faces the capacity loading portion E12.

The third element 5 has a proximal end connected in the middle of the distal end side of the third extending portion E3 and extends in the direction opposite to the fifth extending portion E5.
The fourth extending portion E4 has a wide portion at the distal end side that is wider than the proximal end side and widens in a direction away from the ground surface GND.
Thus, each element is formed between the one side 2a of the substrate body 2 facing the ground plane GND and the ground plane GND, and serves as an antenna occupation area.

In addition, an antenna element AT of a dielectric antenna is connected to the second extending portion E2.
Furthermore, the 1st passive element P1-the 4th passive element P4 are connected to the 2nd extension part E2. That is, the first passive element P1 and the third passive element P3 are connected in series to the second extending portion E2, and the second passive element P2 is between the first passive element P1 and the third passive element P3. The fourth passive element P4 is connected between the base end side of the third passive element P3 and the ground plane GND. In this way, a configuration in which the T-type adjustment circuit is connected by the first passive element P1 to the third passive element P3 is obtained. In this embodiment, a single-stage T-type adjustment circuit is used. However, passive elements may be connected so as to constitute a two-stage or more T-type or π-type 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 ends of the conductor pattern 122 are connected to opposite ends of the divided part of the second extending part E2 for mounting, so that the antenna element AT becomes a part of the second extending part E2.
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, and the third element 5 extend at a distance from each other so as to generate a stray capacitance between them and a stray capacitance between the ground plane GND. Yes.
That is, as shown in FIG. 3, the stray capacitance Ca between the capacity loading portion E12 and the seventh extending portion E7, the stray capacitance Cb between the capacity loading portion E12 and the eleventh extending portion E11, A stray capacitance Cc between the ten extending portion E10 and the fifth extending portion E5, a stray capacitance Cd between the ninth extending portion E9 and the eleventh extending portion E11, and a sixth extending portion E6. The stray capacitance Ce between the ninth extending portion E9, the stray capacitance Cf between the distal end side of the seventh extending portion E7 and the ground plane GND, the proximal end side of the seventh extending portion E7 and the ground plane The stray capacitance Cg between the GND, the stray capacitance Ch between the seventh extending portion E7 and the wide portion E4a, the stray capacitance Ci between the wide portion E4a and the ground plane GND, and the fourth extending portion. The stray capacitance Cj between E4 and the third element 5, the capacity loading portion E12, the fourth extending portion Ck, the third element 5 and the ground A floating capacitance Cl between the GND can be generated.

  Next, each resonance frequency in the antenna device 1 of the present embodiment will be described with reference to the drawings.

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.
The first resonance frequency f1 is determined by the second element 4, the third extending portion E3, the antenna element AT, and the stray capacitance. The second resonance frequency f2 is determined by the first element 3, the third extending portion E3, the antenna element AT, and the stray capacitance. The third resonance frequency f3 is determined by the third element 5, the third extending portion E3, the antenna element AT, and the stray capacitance. Further, the fourth resonance frequency f4 is determined by the capacity loading portion E12, the third extending portion E3, the antenna element AT, 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 set and adjusted by the second element 4, the third extending portion E3, the antenna element AT, and the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf, Cg, Ch, and Ci. can do.
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, Ch, and Ci.
Further, the final frequency adjustment can be flexibly performed by selecting the first passive element P1 and the third passive element P3. 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.
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 third extending portion E3, the antenna element AT, and the stray capacitances Ca, Cf, Ci, Cj, Ch.
Moreover, the impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Ca, Cf, Ci, Cj, and Ch.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the third passive element P3. The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing to the ground plane GND side by selecting the fourth passive element P4.
In this way, the second resonance frequency f2 is adjusted mainly at the portion of the two-dot chain line A2 in FIG.

“About the third resonance frequency f3”
The frequency of the third resonance frequency f3 can be set and adjusted by the third element 5, the third extending portion E3, the antenna element AT, and the stray capacitances Cj and Cl.
The impedance adjustment of the third resonance frequency f3 can be performed by setting the stray capacitances Cj and Cl.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the third passive element P3. The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing to the ground plane GND side by selecting the fourth passive element P4.
In this way, the third resonance frequency f3 is adjusted mainly at the portion of the broken line A3 in FIG.

“About the fourth resonance frequency f4”
The frequency of the fourth resonance frequency f4 can be set and adjusted by the capacity loading portion E12, the third extending portion E3, the antenna element AT, and the stray capacitances Ca, Cb, Ck.
The impedance adjustment of the fourth resonance frequency f4 can be performed by setting each of the stray capacitances Ca, Cb, Ck.
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, the antenna device 1 according to the present embodiment includes the first element 3, the second element 4, and the third element 5 that are patterned on the surface of the substrate body 2 with the metal foil. By effectively using each stray capacitance between the ground and the ground, double resonance can be achieved.
In particular, between the fifth extending portion E5 and the seventh extending portion E7, a capacity loading portion E12 that protrudes from the tip of the third extending portion E3 in the direction opposite to the fourth extending portion E4 is formed. Therefore, a resonance frequency different from the resonance frequency mainly obtained by the first element 3 and the resonance frequency mainly obtained by the second element 4 can be obtained.

  Moreover, between the front end side of the 7th extension part E7 which is high impedance by the protrusion amount of the capacity | capacitance load part E12, and the space | interval of the capacity | capacitance load part E12 and the 5th extension part E5 or the 7th extension part E7. Impedance and bandwidth can be adjusted by controlling the obtained stray capacitance Ca and the stray capacitance Ck obtained between the base end side of the fifth extending portion E5 close to the feeding point FP. For example, when the interval between the capacity loading portion E12 and the seventh extension portion E7 is narrowed, the impedance can be increased, and when the interval between the capacity loading portion E12 and the fifth extension portion E5 is narrowed, the bandwidth is widened. be able to. Furthermore, since the capacity loading portion E12 is in the opposite phase to the first element 3, interference can be reduced and the bandwidth can be expanded.

  In addition, since the eleventh extending portion E11 faces the capacity loading portion E12, the resonance frequency is adjusted according to the stray capacitance Cb generated between the eleventh extending portion E11 and the capacity loading portion E12. Is possible. For example, the resonance frequency becomes lower as the capacity loading portion E12 is closer to the eleventh extending portion E11. In addition, a part of the second element 4 is folded back into a rectangular shape, and the electrical length necessary for the second element 4 can be obtained even if the space is small. In addition, you may make the 2nd element 4 into the meander shape further turned up zigzag.

  Further, since the fourth extending portion E4 has a wide portion E4a which is wider than the base end side and widens away from the ground surface GND at the distal end side, the pattern of the second element 4 itself is wide. And the effect of generating a large stray capacitance Ch between the wide portion E4a and the seventh extending portion E7 can widen the bandwidth.

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, since the antenna element AT of the dielectric antenna is connected to the second extending portion E2, the entire element on the tip side of the second extending portion E2 can be shortened, and the apparatus can be downsized. In addition, the element can have a high impedance.
Furthermore, it is possible to design in the plane of the substrate body 2, and it is possible to reduce the thickness as compared with the case of using a conventional dielectric block or resin molded body, and to select the antenna element AT which is a dielectric antenna. 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.

  Moreover, since the 1st passive element P1-the 4th passive element P4 are connected to the 2nd extension part E2, each resonance frequency can be adjusted flexibly by selection of each passive element, and according to design conditions An antenna device capable of achieving double resonance 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 and the second element 4 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 includes the ground plane GND, the first extending portion E1, the second extending portion E2, and the third extending portion E3. An element side substrate having a ground side substrate 2A having a base end side, a distal end side of the third extending portion E3, a fourth extending portion E4, a second element 4, a third element 5, and a capacity loading portion E12. It is a point divided into 2B. The element side substrate 2B is formed with a third extending portion E3 from the connecting portion of the fifth extending portion E5 to the distal end side, and the ground side substrate 2A is formed with a proximal end side of the third extending portion E3. Has been.

In the second embodiment, the proximal end side of the third extending portion E3 and the distal end side of the third extending portion E3 are electrically connected via the conductive member 22. That is, the first connection point S1 provided on the base end side of the third extension portion E3 of the ground side substrate 2A and the second connection point provided on the tip side of the third extension portion E3 of the element side substrate 2B. S2 is connected by a conductive member 22 such as a leaf spring (spring contact) or FPC. Thus, the conductive member 22 functions as a part of the third extending portion E3.
The element-side substrate 2B can be installed so as to face the ground-side substrate 2A while being connected by the conductive member 22. That is, the antenna device 21 can be folded back via the conductive member 22. 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 of the first embodiment is actually manufactured will be described with reference to FIG.

In these measurements, the following passive elements were used.
First passive element P1: Capacitor with C = 3.0 pF Second passive element P2: Inductor with L = 2.2 nH Third passive element P3: R = 0Ω (jumper wire)
Fourth passive element P4: C = 0.6 pF capacitor

As can be seen from the measurement results, as shown in Table 1 below and FIG. 5, all of the first to fourth resonance frequencies f1 to f4 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. As can be seen from FIG. 5, the frequency bands of the third resonance frequency f3 and the fourth resonance frequency f4 adjacent to each other are partially combined by widening the band.

The present invention is not limited to the above embodiments and examples, and various modifications can be made without departing from the spirit of the present invention.
For example, as described above, it is preferable to provide an antenna element in the second extending portion. However, the antenna device is provided in the seventh extending portion or the third element to shorten the element, and the entire apparatus The size may be reduced.

In addition, as described above, it is preferable to connect the antenna element to be a part of the element, but the second 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 second extension 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 being folded back zigzag. 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 device, 2 ... Board body, 2a ... One side of board body, 2A ... Ground side board, 2B ... Element side board, 3 ... 1st element, 4 ... 2nd element, 5 ... 3rd element, AT ... antenna element, E1 ... first extension part, E2 ... second extension part, E3 ... third extension part, E4 ... fourth extension part, E5 ... fifth extension part, E6 ... sixth extension Part, E7 ... seventh extension part, E8 ... eighth extension part, E9 ... ninth extension part, E10 ... tenth extension part, E11 ... eleventh extension part, E12 ... capacity loading part, GND ... Ground plane, P1 ... first passive element, P2 ... second passive element, P3 ... third passive element, P4 ... fourth passive element, FP ... feed point

Claims (7)

An insulating substrate body, and a ground surface patterned with a metal foil on the surface of the substrate body, a first element and a second element,
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 the first extension portion. A second extending portion extending in a direction orthogonal to the first extending portion from the tip of the first extending portion, and a direction orthogonal to the second extending portion from the tip of the second extending portion, the ground plane side A third extending part extending in a direction other than the fourth extending part extending in a direction orthogonal to the third extending part from the tip of the third extending part,
From the tip of the 5th extension part, the 5th extension part where the base end is connected to the 2nd element in the middle of the 3rd extension part, and extends in the direction opposite to the 4th extension part. A sixth extending portion extending toward the distal end side of the third extending portion along the third extending portion; and a third extending from the distal end of the sixth extending portion along the fifth extending portion. A seventh extension part extending to the vicinity of the tip of the extension part,
A capacity loading portion is formed between the fifth extension portion and the seventh extension portion so as to protrude from the tip of the third extension portion in a direction opposite to the fourth extension portion. An antenna device. The antenna device according to claim 1,
The seventh extending portion has, on its proximal end side, an eighth extending portion extending from the tip of the sixth extending portion along the fifth extending portion, and a tip of the eighth extending portion. A ninth extension portion extending from the tip of the ninth extension portion to the third extension portion side along the fifth extension portion. 10 extending portions, and an eleventh extending portion extending in a direction away from the fifth extending portion from the tip of the tenth extending portion,
The antenna device according to claim 11, wherein the eleventh extending portion faces the capacity loading portion. In the antenna device according to claim 1 or 2,
Comprising a third element patterned with a metal foil on the surface of the substrate body;
The antenna device according to claim 1, wherein a base end of the third element is connected to the middle of the third extending portion and extends in a direction opposite to the fifth extending portion. In the antenna device according to any one of claims 1 to 3,
The antenna device, wherein the fourth extending portion has a wide portion at a distal end side that is wider than a proximal end side and widens in a direction away from the ground plane. In the antenna device according to any one of claims 1 to 4,
The substrate body includes a ground-side substrate having a base end side of the ground surface, the first extending portion, the second extending portion, and the third extending portion;
Divided into an element side substrate having a tip side of the third extension part, the fourth extension part, the second element, and the capacity loading part;
An antenna device, wherein a base end side of the third extension portion and a tip end side of the third extension portion are electrically connected via a conductive member. In the antenna device according to any one of claims 1 to 5,
An antenna device, wherein an antenna element of a dielectric antenna is connected to the second extending portion. In the antenna device according to any one of claims 1 to 6,
An antenna device, wherein a passive element is connected to the second extending portion.