JP6327461B2 - 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 A third extension part extending toward the first part, a fourth extension part extending in a direction perpendicular to the third extension part from a tip of the third extension part, and a fourth extension part A fifth extending portion extending from the tip in a direction orthogonal to the fourth extending portion, and The second element includes a sixth extending portion whose proximal end is connected in the middle of the third extending portion and extending in a direction opposite to the fourth extending portion, and a distal end of the sixth extending portion. A seventh extension portion extending along the fifth extension portion; and an eighth extension extending from the tip end of the seventh extension portion to the vicinity of the tip end of the third extension portion along the sixth extension portion. A capacity loading portion that protrudes in the opposite direction to the fourth extension portion from the middle of the fifth extension portion between the sixth extension portion and the eighth 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, since a capacity loading portion is formed between the sixth extension portion and the eighth extension portion so as to protrude from the middle of the fifth 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 tip end side of the eighth extension 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 sixth extension portion or the eighth extension portion, The impedance and the bandwidth can be adjusted by controlling the stray capacitance obtained between the base end side of the sixth extension portion close to the feeding point. For example, although affected by the relationship with each stray capacitance, when the interval between the capacity loading portion and the eighth extension portion is narrowed, the impedance of the open ends of the first element and the second element can be increased, When the interval between the capacity loading portion and the sixth extension portion is narrowed, the bandwidth of the resonance frequency obtained by the first element or the second element 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 eighth extension portion extends from the distal end of the seventh extension portion along the sixth extension portion to the base end side thereof. A ninth extending portion, a tenth extending portion extending from the tip of the ninth extending portion toward the sixth extending portion, and the sixth extending from the tip of the tenth extending portion. An eleventh extending portion extending toward the third extending portion along the portion, and a twelfth extending portion extending in a direction away from the sixth extending portion from the tip of the eleventh extending portion. And the twelfth extending portion faces the capacity loading portion.
That is, in this antenna device, since the twelfth extending portion faces the capacity loading portion, the resonance frequency is adjusted according to the stray capacitance generated between the twelfth 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 twelfth extending 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, wherein the substrate main body is a base of the ground surface, the first extending portion, the second extending portion, and the third extending portion. A ground side substrate having an end side; an element side substrate having a tip end side of the third extending portion; the fourth extending portion; the fifth 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 element side substrate is separated from the ground side substrate on the ground surface side even when there is no space for 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 fourth invention is characterized in that, in any one of the first to third inventions, an antenna element of a dielectric antenna is connected to the fourth 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 particular, the stray capacitance is also generated between the capacitive loading portion and the antenna element having a high impedance, so that the impedance can be further increased.
Further, since the antenna element of the dielectric antenna is connected to the fourth extending portion, the entire element on the tip side from the fourth extending portion of the first element can be shortened, and the apparatus can be downsized. And the element can have a 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 fifth invention is characterized in that, in any one of the first to fourth 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 sixth extension portion and the eighth extension portion so as to protrude from the middle of the fifth 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 3 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 and 2nd element 4 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 a fifth extending portion E5 extending in a direction orthogonal to the fourth extending portion E4 from the tip of the fourth extending portion E4.

  The second element 4 includes a sixth extending portion E6 having a proximal 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 sixth extending portion E6. From the tip end to the seventh extension portion E7 extending along the fifth extension portion E5, and from the tip end of the seventh extension portion E7 to the vicinity of the tip end of the third extension portion E3 along the sixth extension portion E6. It has the 8th extension part E8 extended.

  Further, between the sixth extending portion E6 and the eighth extending portion E8, a capacity loading portion is formed that protrudes in the opposite direction to the fourth extending portion E4 from the middle of the fifth extending portion E5. . That is, the tip end side of the capacity loading portion E20 is surrounded by the second element 4, and each of the sixth extending portion E6, the capacity loading portion E20, and the eighth extending portion E8 formed of a metal foil such as a copper foil. Are arranged in parallel with each other from the ground plane GND side in this order.

  The eighth extending portion E8 includes, on its proximal end side, a ninth extending portion E9 extending along the sixth extending portion E6 from the distal end of the seventh extending portion E7, and a ninth extending portion E9. A tenth extending portion E10 extending from the tip of the tenth extending portion E6 toward the sixth extending portion E6, and extending from the tip of the tenth extending portion E10 to the third extending portion E3 side along the sixth extending portion E6. An eleventh extending portion E11 that is present, and a twelfth extending portion E12 that has a twelfth extending portion E12 that extends from the tip of the eleventh extending portion E11 in a direction away from the sixth extending portion E6. However, it faces the capacity loading portion E20.

The fifth extending portion E5 is a wide portion formed wider than the fourth extending portion E4. Further, as described above, the base end of the capacity loading portion E20 is connected to the fifth extending portion E5 in the middle, and the distal end side from the connecting portion of the capacity loading portion E20 extends to the fifth extending portion E5. It becomes the protrusion part E5a which protrudes in the present direction. A side portion of the protruding portion E5a and a tip end of the eighth extending portion E8 are opposed to each other.
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.

An antenna element AT of a dielectric antenna is connected to the fourth extending portion E4.
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 to form a two-stage or more T-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 end portions of the conductor pattern 122 are connected to opposite ends of the divided portion of the fourth extending portion E4 for mounting, so that the antenna element AT becomes a part of the fourth extending portion E4.
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 capacity loading portion E <b> 20 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 eighth extending portion E8 and the protruding portion E5a, and the stray capacitance Cb between the capacity loading portion E20 and the tip end side of the eighth extending portion E8, The stray capacitance Cc between the capacity loading portion E20 and the twelfth extending portion E12, the stray capacitance Cd between the capacity loading portion E20 and the sixth extending portion E6, and the capacity loading portion E20 and the third extension. The stray capacitance Ce between the tip of the portion E3, the stray capacitance Cf between the capacitance loading portion E20 and the antenna element AT, the stray capacitance Cg between the fifth extending portion E5 and the ground plane GND, 8 stray capacitance Ch between the front end side of the extending portion E8 and the ground surface GND, stray capacitance Ci between the ninth extending portion E9 and the ground surface GND, and the sixth extending portion E6 and the eleventh extending portion. The stray capacitance Cj between the existing portion E11 and the stray capacitance between the tenth extending portion E10 and the twelfth extending portion E12. And ck, a seventh extending portion E7 and stray capacitance Cl between the first 10 extending part E10 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 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 capacitive loading portion E20, the antenna element AT, and the stray capacitance on the base end side from the protruding portion E5a. The second resonance frequency f2 is determined by the second element 4 and stray capacitance. The third resonance frequency f3 is determined by the first element 3, 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 by the first element 3, the capacitive loading portion E20, the antenna element AT, and the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf, and Cg on the proximal side from the protruding portion E5a. And can be 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, Cf, and Cg.
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 second element 4 and the stray capacitances Ca, Cb, Cc, Cd, Ch, Ci, Cj, Ck, and Cl.
Further, the impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Ca, Cb, Cc, Cd, Ch, Ci, Cj, Ck, 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 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 first element 3, the antenna element AT, and the stray capacitances Ca and Cg.
Further, the impedance adjustment of the third resonance frequency f3 can be performed by setting the stray capacitances Ca and Cg.
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.

As described above, the antenna device 1 according to the present embodiment includes the first element 3 and the second element 4 that are patterned with the metal foil on the surface of the substrate body 2. It is possible to make multiple resonances by effectively using each stray capacitance between them.
In particular, between the sixth extending portion E6 and the eighth extending portion E8, a capacity loading portion E20 that protrudes in the opposite direction to the fourth extending portion E4 from the middle of the fifth extending portion E5 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.

Further, depending on the protruding amount of the capacity loading portion E20 and the interval between the capacity loading portion E20 and the sixth extending portion E6 or the eighth extending portion E8, between the front end side of the eighth extending portion E8 which is high impedance. The impedance and bandwidth can be adjusted by controlling the stray capacitance Cb obtained and the stray capacitance Cd obtained between the base end side of the sixth extending portion E6 close to the feeding point FP.
For example, although influenced by the relationship with each stray capacitance, when the interval between the capacity loading portion E20 and the eighth extending portion E8 is narrowed, the impedance of the open ends of the first element 3 and the second element 4 is increased. When the interval between the capacity loading portion and the sixth extending portion E6 is narrowed, the bandwidth of the resonance frequency obtained by the first element 3 or the second element 4 can be widened.

  Specifically, the impedance of the open ends of the first element 3 and the second element 4 is fixed by fixing the width of the capacity loading portion E20 and changing the widths of the eighth extending portion E8 and the sixth extending portion E6. And the bandwidth of the resonance frequency obtained by the second element 4 can be increased. Moreover, the first element 3 and the second element are controlled by controlling the stray capacitance Cb by fixing the widths of the eighth extending part E8 and the sixth extending part E6 and changing the width of the capacity loading part E20. 4, the impedance of the open end can be increased, and the bandwidth of the resonance frequency obtained by the first element 3 can be widened by the width of the capacity loading portion E20. Further, the impedance and bandwidth of the open ends of the first element 3 and the second element 4 can be flexibly changed by changing the width of the capacity loading part E20 and the widths of the eighth extension part E8 and the sixth extension part E6. It becomes possible to adjust to.

  In the second element 4, a space is vacant on the opposite side (upper side in the drawing) of the eighth extending part E <b> 8 to the sixth extending part E <b> 6, and it is easy to ensure a high impedance. Further, in the first element 3, since the capacity loading portion E20 is disposed between the eighth extending portion E8 and the sixth extending portion E6, the pattern width and the stray capacitance Cb are compared with those of the second element 4. , Cd and the like can be arbitrarily adjusted. As a result, the first element 3 is designed after the second element 4 is preferentially designed, and the desired performance tends to be easily achieved.

  Further, since the twelfth extending portion E12 faces the capacity loading portion E20, the resonance frequency is adjusted according to the stray capacitance Cc generated between the twelfth extending portion E12 and the capacity loading portion E20. Is possible. For example, the resonance frequency becomes lower as the capacity loading portion E20 is closer to the twelfth extending portion E12. 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, 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.
Further, since the antenna element AT of the dielectric antenna is connected to the fourth extending portion E4, the entire element on the tip side from the fourth extending portion E4 of the first element 3 can be shortened, and the device The element can be miniaturized and the element can have 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 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 fifth extending portion E5, a second element 4, and a capacity loading portion E20. This is a point divided into the side substrate 2B.

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 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. Therefore, even when there is no space for arranging the ground plane GND, the element side substrate 2B. Is separately provided separately from the ground side substrate 2A on the ground plane GND side, 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 = 1.8 nH Third passive element P3: R = 0Ω (jumper wire)
Fourth passive element P4: C = 1.2 pF capacitor

As can be seen from the measurement results, as shown in Table 1 below and FIG. 5, 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.

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 fourth extending portion. However, the antenna element is provided in the second element to shorten the element so as to reduce the size of the entire apparatus. It doesn't matter.

In addition, as described above, it is preferable to connect the antenna element to be a part of the element. However, the antenna element may not be connected, and may be a fourth extending portion that is extended only by a metal foil such as a copper foil. . At this time, in order to increase the impedance, at least a part of the fourth extending part is formed into a narrow pattern narrower than the other parts, or a meander pattern extending in a fixed 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 device, 2 ... Board body, 2a ... One side of board body, 2A ... Ground side board, 2B ... Element side board, 3 ... 1st element, 4 ... 2nd element, AT ... Antenna element, E1 ... 1st extension part, E2 ... 2nd extension part, E3 ... 3rd extension part, E4 ... 4th extension part, E5 ... 5th extension part, E6 ... 6th extension part, E7 ... 7th Extension part, E8 ... 8th extension part, E9 ... 9th extension part, E10 ... 10th extension part, E11 ... 11th extension part, E12 ... 12th extension part, E20 ... Capacity loading part, GND: ground plane, P1: first passive element, P2: second passive element, P3: third passive element, P4: fourth passive element, FP: feeding point

Claims (5)

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 portion extending in a direction other than the fourth extending portion, a fourth extending portion extending in a direction orthogonal to the third extending portion from a tip of the third extending portion, and the fourth extending portion. A fifth extending portion extending in a direction orthogonal to the fourth extending portion from the tip of the existing portion;
From the tip of the 6th extension part, the 6th 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 seventh extension extending along the fifth extension; and a tip extending from the tip of the seventh extension to the vicinity of the tip of the third extension along the sixth extension. And an eighth extension part,
A capacity loading portion is formed between the sixth extension portion and the eighth extension portion so as to protrude from the middle of the fifth extension portion in a direction opposite to the fourth extension portion. An antenna device. The antenna device according to claim 1,
The eighth extending portion has, on its proximal end side, a ninth extending portion extending from the tip of the seventh extending portion along the sixth extending portion, and a tip of the ninth extending portion. A tenth extending portion extending from the distal end of the tenth extending portion toward the third extending portion side along the sixth extending portion. 11 extending portion, and a twelfth extending portion extending in a direction away from the sixth extending portion from the tip of the eleventh extending portion,
The antenna device according to claim 12, wherein the twelfth extending portion faces the capacity loading portion. In the antenna device according to claim 1 or 2,
The substrate body includes a ground side substrate having the ground surface, the first extending portion, the second extending portion, and a base end side of the third extending portion;
Divided into an element side substrate having a tip side of the third extension part, the fourth extension part, the fifth 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 3,
An antenna device, wherein an antenna element of a dielectric antenna is connected to the fourth extending portion. In the antenna device according to any one of claims 1 to 4,
An antenna device, wherein a passive element is connected to the second extending portion.