JP6198049B2 - 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 invention includes an insulating substrate body, a ground surface patterned with metal foil on at least one of a front surface and a back surface of the substrate body, a first element, and a second element, respectively. The first element is provided with a feeding point on a proximal end side close to the ground surface, and extends in a direction away from the ground surface; and A second extending portion extending from the tip in a direction orthogonal to the first extending portion; a third extending portion extending in a direction away from the ground surface from the tip of the second extending portion; A fourth extending portion extending from the distal end of the third extending portion along the second extending portion toward the proximal end side of the second extending portion, and the second element includes: A direction in which a base end is connected in the middle of the first extending portion and is orthogonal to the first extending portion. A fifth extending portion extending toward the opposite side of the second extending portion, and a sixth extending portion extending in a direction away from the ground surface from the tip of the fifth extending portion. A seventh extending portion extending from the distal end of the sixth extending portion along the fifth extending portion toward the proximal end side of the fourth extending portion, and the seventh extending portion The tip end side of the portion extends along the tip end side of the fourth extension portion at a position separated from the ground surface from the fourth extension portion or a position immediately below the fourth extension portion. It is characterized by.

In this antenna device, since at least one of the front surface and the back surface of the substrate main body is provided with the ground surface, the first element, and the second element, each of which is patterned with a metal foil, between each element and the ground surface It is possible to make multiple resonances by effectively using each stray capacitance between them.
In particular, the distal end side of the seventh extending portion extends at least along the distal end side of the fourth extending portion at a position separated from the ground surface from the fourth extending portion or a position immediately below the fourth extending portion. The stray capacitance between the second extension portion and the ground plane, the stray capacitance between the second extension portion and the fourth extension portion, the fourth extension portion and the seventh extension portion. The impedance can be flexibly adjusted by at least three stray capacitances generated in series with the stray capacitance between the two. In addition, since the directions of the high-frequency currents flowing in the second extension part, the fourth extension part, and the seventh extension part are opposite to each other in the second extension part, the two extension parts do not interfere with each other, and each resonance frequency is designed. It is easy to remove and wide band is also possible.

The antenna device according to a second invention is the antenna device according to the first invention, wherein the ground surface, the first element, and the fifth extending portion are formed on a surface of the substrate body, and the sixth extending portion and the A seventh extension portion is formed on the back surface of the substrate body, and a base end portion of the sixth extension portion and a tip end portion of the fifth extension portion are connected via a through hole; The distal end side of the seventh extending portion is arranged directly below the fourth extending portion.
That is, in this antenna device, the base end portion of the sixth extending portion on the back surface side and the tip end portion of the fifth extending portion on the front surface side are connected via the through hole, and the seventh extending portion which is a capacity loading portion. Since the tip end side of the portion is arranged immediately below the fourth extending portion, a space for providing the seventh extending portion on the surface side is not necessary, and the entire size can be reduced. In addition, since the substrate main body is sandwiched between the fourth extending portion and the seventh extending portion, the design utilizing the dielectric constant of the substrate main body becomes possible.

An antenna device according to a third invention is characterized in that, in the first or second invention, the third extending portion has a first wide portion wider than the fourth extending portion. And
That is, in this antenna device, since the third extending portion has the first wide portion that is wider than the fourth extending portion, the third extending portion floats in the first wide portion provided in the relatively low impedance portion. By increasing the capacity, it is possible to increase the bandwidth at the resonance frequency obtained mainly by the first element.

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 sixth extending portion has a second widened portion wider than the seventh extending portion. It is characterized by that.
That is, in this antenna device, since the sixth extending portion has the second wide portion that is wider than the seventh extending portion, it floats in the second wide portion provided in the relatively low impedance portion. By increasing the capacity, it is possible to increase the bandwidth at the resonance frequency obtained mainly by the second element.

An antenna device according to a fifth invention is characterized in that, in any one of the first to fourth 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, the stray capacitance generated between the antenna element having a high impedance and the fourth extending portion can be effectively used.
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.

The antenna device according to a sixth aspect of the present invention is the antenna device according to any one of the first to fifth aspects, wherein a first passive element is connected to the first extending portion and a second passive element is connected to the second extending portion. A third passive element is connected to the sixth extending portion.
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.
Further, by selecting a second passive element that has a high impedance with respect to a specific resonance frequency, another resonance frequency can be obtained between the first extension part and the second passive element of the second extension part. It is possible to obtain

The present invention has the following effects.
According to the antenna device of the present invention, since at least one of the front surface and the back surface of the substrate main body includes the ground surface, the first element, and the second element that are patterned with the metal foil, A stray capacitance is generated between the ground plane and the like, and a double resonance can be achieved with at least two resonance frequencies.
In particular, the distal end side of the seventh extending portion extends at least along the distal end side of the fourth extending portion at a position separated from the ground surface from the fourth extending portion or a position immediately below the fourth extending portion. Therefore, the impedance can be flexibly adjusted by three stray capacitances generated in series between the extending portions.
In addition, each resonant frequency can be flexibly adjusted by selecting the antenna element and passive element connected to the element, so that multiple resonance can be achieved according to design conditions, and miniaturization and high performance can be achieved. .
Therefore, the antenna device of the present invention can easily achieve multiple resonances corresponding to various applications and devices, and can save space.

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

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

  As shown in FIGS. 1 and 2, the antenna device 1 according to the present embodiment includes an insulating substrate body 2 and a ground surface GND that is patterned on a surface of the substrate body 2 with a metal foil such as a copper foil. A ground pattern G1, a first element 3 and a second element 4 are provided.

The first element 3 includes a first extending portion E1 provided with a feeding point FP on the base end side close to the ground surface GND and extending in a direction away from the ground surface GND, and a first extending portion E1. A second extending portion E2 extending from the tip in a direction orthogonal to the first extending portion E1, and a third extending portion E3 extending in a direction away from the ground surface GND from the tip of the second extending portion E2. And a fourth extending portion E4 extending from the distal end of the third extending portion E3 along the second extending portion E2 toward the proximal end side of the second extending portion E2.
Note that the direction orthogonal to the first extending portion E1 is a direction along the end side of the ground surface GND facing the base end portion of the first extending portion E1, and the substrate body 2 facing this end side It is also a direction along one side. The direction away from the ground plane GND is the direction toward the one side of the substrate body 2.

The second element 4 has a first end that is connected in the middle of the first extending portion E1 and extends in a direction perpendicular to the first extending portion E1 and opposite to the second extending portion E2. A fifth extending portion E5, a sixth extending portion E6 extending from the tip of the fifth extending portion E5 in a direction away from the ground surface GND, and a fifth extending portion E5 from the tip of the sixth extending portion E6. And a seventh extending portion E7 extending toward the base end side of the fourth extending portion E4.
That is, the first element 3 has a shape that is folded in an inverted U shape, and the second element 4 has a shape that is folded in a U shape so as to cover the opening side of the first element 3.

The distal end side of the seventh extending portion E7 extends at least along the distal end side of the fourth extending portion E4 at a position separated from the ground surface GND from the fourth extending portion E4.
In addition, the front-end | tip part of the said 1st extension part E1 becomes the wide part E1a wider on the 6th extension part E6 side rather than the base end side. The wide portion E1a is formed wide on the sixth extending portion E6 side.

In the middle of the second extending portion E2, an antenna element AT of a dielectric antenna is connected.
In addition, the first passive element P1 is connected in the middle of the first extending portion E1, and the second passive element P2 is connected in the middle of the second extending portion E2. A third passive element P3 is connected in the middle of the part E6. That is, the first passive element P1 is connected between the base end of the wide part E1a and the connection part of the fifth extension part E5, and the second passive element P2 is more than the antenna element AT of the second extension part E2. Is also connected to the tip side.

  In addition, the distal end side of the ground pattern G1 and the distal end side of the first extending portion E1 are connected via the fourth passive element P4, and the proximal end side of the ground pattern G1 and the base of the first extending portion E1 are connected. The end side is connected via the fifth passive element P5. Furthermore, a sixth passive element P6 is connected between the fourth passive element P4 and the fifth passive element P5 of the first extending portion E1. As described above, the fourth passive element P4, the fifth passive element P5, and the sixth passive element P6 constitute a π-type impedance adjustment circuit.

The ground pattern G1 has a distal end extending to the base end of the fifth extending portion E5.
The third extending portion E3 is wider than the second extending portion E2 and the fourth extending portion E4, and extends slightly inclined toward the distal end side of the fourth extending portion E4.
The distal end portion of the sixth extending portion E6 extends slightly inclined toward the distal end side of the seventh extending portion E7.

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 and the second element 4 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.
That is, as shown in FIG. 3, the stray capacitance Ca between the seventh extending portion E7 and the fourth extending portion E4, the stray capacitance Cb between the fourth extending portion E4 and the antenna element AT, The stray capacitance Cc between the base end side of the second extending portion E2 from the second passive element P2 and the fourth extending portion E4, the tip side of the second extending portion E2 from the second passive element P2, and the fourth side. The stray capacitance Cd between the extended portion E4, the stray capacitance Ce between the tip side of the second passive element P2 of the second extending portion E2 and the ground plane GND, and the second of the second extending portion E2. The stray capacitance Cf between the base end side of the passive element P2 and the ground plane GND, the stray capacitance Cg between the antenna element AT and the ground plane GND, and between the seventh extending portion E7 and the wide portion E1a. The stray capacitance Ch, the stray capacitance Ci between the sixth extending portion E6 and the wide portion E1a, the fifth extending portion E5, and the ground plane GND And the stray capacitance Cj between 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, and the stray capacitance. The second resonance frequency f2 is determined by the antenna element AT, the second extending portion E2, the first extending portion E1, and the stray capacitance. Further, the third resonance frequency f3 is determined by the second element 4 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 can be set and adjusted by the first element 3, the antenna element AT, the first passive element P1, and the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf, and Cg. .
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 second passive element P2.
The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing on the ground pattern G1 and the ground plane GND side by selecting the fourth passive element P4.
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 antenna element AT, the second extending portion E2, the first extending portion E1, and the stray capacitances Cb, Cc, Cf, Cg.
Further, the impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Cb, Cc, Cf, and Cg.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the first passive element P1.
The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing on the ground pattern G1 and the ground plane GND side by selecting the fourth passive element P4.
Thus, the second resonance frequency f2 is adjusted mainly at the portion indicated by the broken line A2 in FIG.

“About the third resonance frequency f3”
The frequency of the third resonance frequency f3 can be set and adjusted by the second element 4 and the stray capacitances Ca, Ch, Ci, Cj.
Moreover, the impedance adjustment of the third resonance frequency f3 can be performed by setting each of the stray capacitances Ca, Ch, Ci, Cj.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the third passive element P3 and the sixth passive element P6.
The final impedance adjustment can be flexibly performed by controlling the flow of the high-frequency current flowing on the ground pattern G1 and the ground plane GND side by selecting the fifth passive element P5.
In this way, the third resonance frequency f3 is adjusted mainly at the portion of the two-dot chain line A3 in FIG.

  As described above, the antenna device 1 according to the present embodiment includes the ground surface GND, the first element 3 and the second element 4 each of which is patterned with a metal foil on the surface of the substrate body 2. By effectively utilizing each stray capacitance between the gap and the ground plane GND, a double resonance can be achieved.

  In particular, since the distal end side of the seventh extending portion E7 extends along the distal end side of the fourth extending portion E4 at a position farther from the ground surface GND than the fourth extending portion E4, the second extending portion The stray capacitance between the existing portion E2 and the ground plane GND, the stray capacitance between the second extending portion E2 and the fourth extending portion E4, the fourth extending portion E4 and the seventh extending portion E7, The impedance can be flexibly adjusted by at least three stray capacitances generated in series with the stray capacitance between the two. Further, in the second extending portion E2, the fourth extending portion E4, and the seventh extending portion E7, the directions of the high-frequency currents flowing between the adjacent ones are opposite to each other, so that they do not interfere with each other, and each resonance The frequency can be easily designed and the bandwidth can be increased.

Further, since the third extending portion E3 is set wider than the fourth extending portion E4, stray capacitance is generated by the wide third extending portion E3 provided in the portion having a relatively low impedance. As a result, it is possible to increase the bandwidth at the resonance frequency obtained mainly by the first element.
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, the stray capacitance generated between the antenna element AT and the fourth extending portion E4 having high impedance can be effectively used.

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.

  In addition, since the second passive element P2 is connected to the second extending part E2, the first extending part can be selected by selecting the second passive element P2 having a high impedance with respect to a specific resonance frequency. It is possible to obtain another resonance frequency from E1 to the second passive element P2 of the second extending portion E2. In other words, this enables three resonances.

  Next, a second embodiment and a third embodiment of the antenna device according to the present invention will be described below with reference to FIGS. In the following description of each embodiment, the same constituent elements 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, the first element 3 and the second element 4 are formed on one surface side of the substrate body 2, whereas the first embodiment is different from the first embodiment. In the antenna device 21 according to the second embodiment, as shown in FIG. 6, a part of the second element 24 is formed on the back surface side of the substrate body 2 and is connected to the front surface side through the through hole H. .

That is, in the second embodiment, the ground plane GND, the first element 3 and the fifth extending portion E5 are formed on the surface of the substrate body 2, and the sixth extending portion E6 and the seventh extending portion E7 are: It is formed on the back surface of the substrate body 2, and the proximal end portion of the sixth extending portion E 6 and the distal end portion of the fifth extending portion E 5 are connected through the through hole H. Further, the distal end side of the seventh extending portion E7 is disposed directly below the fourth extending portion E4 with the substrate body 2 interposed therebetween. Therefore, in the first embodiment, the distal end side of the seventh extending portion E7 and the distal end side of the fourth extending portion E4 are arranged in parallel on the surface of the substrate body 2, whereas the second embodiment Then, the distal end side of the seventh extending portion E7 and the distal end side of the fourth extending portion E4 are arranged in an opposed state on the front and back surfaces of the substrate body 2.
In the plan view of FIG. 6, the sixth extending portion E6 and the seventh extending portion E7 on the back surface (bottom surface) side are indicated by broken lines.

  Thus, in the second embodiment, the base end portion of the sixth extending portion E6 on the back surface side and the tip end portion of the fifth extending portion E5 on the front surface side are connected via the through hole H, and the capacity loading portion Since the distal end side of a certain seventh extending portion E7 is arranged directly below the fourth extending portion E4, a space for providing the seventh extending portion E7 on the surface side is not necessary, and the entire size can be reduced. I can plan. In addition, since the substrate body 2 is sandwiched between the fourth extending portion E4 and the seventh extending portion E7, a design using the dielectric constant of the substrate body 2 is possible.

  Next, the difference between the third embodiment and the first embodiment is that in the first embodiment, the third extending portion E3 and the sixth extending portion E6 are formed only on the surface side of the substrate body 2. On the other hand, in the antenna device 31 of the third embodiment, as shown in FIG. 7, the first wide portion E3a is formed as a part of the third extending portion E3 on the back surface side of the substrate body 2 as well. In addition, the second wide portion E6a is formed as a part of the sixth extending portion E6.

  That is, in the third embodiment, the third extending portion E3 of the first element 33 has the first wide portion E3a that is wider than the fourth extending portion E4 on the back surface side of the substrate body 2. The sixth extending portion E6 of the second element 34 has a second wide portion E6a that is wider than the seventh extending portion E7. Each of the first wide portion E3a and the second wide portion E6a is an additional pattern connected to the fourth extending portion E4 or the sixth extending portion E6 on the surface side through the through hole H.

  Thus, in 3rd Embodiment, since the 3rd extension part E3 has the 1st wide part E3a wider than the 4th extension part E4, it provided in the part with comparatively low impedance. By increasing the stray capacitance at the first wide portion E3a, it is possible to increase the bandwidth at the resonance frequency obtained mainly by the first element 33. Further, since the sixth extending portion E6 has the second wide portion E6a that is wider than the seventh extending portion E7, the stray capacitance is reduced by the second wide portion provided in the portion having a relatively low impedance. By increasing the frequency, it is possible to increase the bandwidth at the resonance frequency obtained mainly by the second element 34.

  In the third embodiment, the second wide portion E6a is provided on the back surface side of the substrate body 2. However, the sixth extending portion E6 is formed on the back surface side of the substrate body 2 as in the second embodiment. In this case, the second wide portion E6a may be formed on the front surface side of the substrate body 2 and connected to the sixth extending portion E6 on the back surface side through the through hole H.

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

In these measurements, the following passive elements were used.
First passive element P1: Inductor with L = 8.2 nH Second passive element P2: Inductor with L = 30 nH Third passive element P3: Inductor with L = 3.3 nH Fourth passive element P4: Inductor with L = 4.7 pH 5th passive element P5: R = 0Ω (jumper wire)
Sixth passive element P6: C = 0.5 pF capacitor

As can be seen from the measurement results, the first to third resonance frequencies f1 to f3 are obtained with a good bandwidth as shown in Table 1 below.
The frequency band of the first resonance frequency f1 is the 900 MHz band. The frequency bands of the second resonance frequency f2 and the third resonance frequency f3 are close to each other, and the combined band is the 2000 MHz band.

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

For example, in each of the above embodiments, the antenna element is provided in the second extending portion, but the antenna element is provided in the fourth extending portion and the seventh extending portion to shorten the element, thereby reducing the size of the entire apparatus. You may plan to make it.
In each of the above embodiments, the ground plane, the ground pattern, and the impedance adjustment circuit are formed together with the first element and the second element on one substrate body, but the first element and the second element are formed on the substrate body. Divided into two board parts divided into a board part formed with a ground plane, a ground pattern and an impedance adjustment circuit, and these may be electrically connected to each other by connection wiring or the like. I do not care.
Further, the substrate main body is formed of a substrate portion in which a portion from the middle of the second extending portion to the tip of the first element and a portion from the middle of the sixth extending portion to the tip of the second element are formed, The board portion may be divided into two board portions, and these portions may be divided into two board portions, which are electrically connected to each other by a connection wiring or the like.

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 ... Antenna device, 2 ... Board | substrate main body, 33 ... 1st element, 4, 24, 34 ... 2nd element, AT ... Antenna element, E1 ... 1st extension part, E2 ... 2nd extension part, E3 ... 3rd extension part, E3a ... 1st wide part, E4 ... 4th extension part, E5 ... 5th extension part, E6 ... 6th extension part, E6a ... 2nd wide part, E7 ... 7th extension Local part, G1 ... Ground pattern, GND ... Ground surface, H ... Through hole, P1 ... First passive element, P2 ... Second passive element, P3 ... Third passive element, P4 ... Fourth passive element, P5 ... Fifth Passive element, P6 ... Sixth passive element, FP ... Feed point

Claims (6)

An insulating substrate body;
At least one of the front surface and the back surface of the substrate body includes a ground surface patterned with a metal foil, a first element, and a second element,
The first element is 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 from the distal end of the first extension portion, the first element A second extending portion extending in a direction orthogonal to the first extending portion, a third extending portion extending in a direction away from the ground surface from the tip of the second extending portion, and the third from the tip of the extending portion along the second extending portion extend toward the base end side of the second extending portion, and a fourth extending portion tip is an open end,
A second end of the second element is connected in the middle of the first extending portion, and extends in a direction perpendicular to the first extending portion and opposite to the second extending portion. An extension part, a sixth extension part extending from the tip of the fifth extension part in a direction away from the ground surface, and a tip of the sixth extension part along the fifth extension part extend toward the base end side of the fourth extension portion, and a seventh extending part which tip is an open end,
The distal end side of the seventh extending portion extends along the distal end side of the fourth extending portion at a position separated from the ground surface from the fourth extending portion or a position directly below the fourth extending portion. Exist ,
The antenna device, wherein the second extending portion, the fourth extending portion, and the seventh extending portion have mutually opposite directions of high-frequency currents flowing between them . The antenna device according to claim 1,
The ground plane, the first element, and the fifth extending portion are formed on the surface of the substrate body,
The sixth extending portion and the seventh extending portion are formed on the back surface of the substrate body, and a proximal end portion of the sixth extending portion and a distal end portion of the fifth extending portion are provided. Connected through through holes,
The antenna device according to claim 7, wherein a distal end side of the seventh extending portion is disposed immediately below the fourth extending portion. In the antenna device according to claim 1 or 2,
The antenna device, wherein the third extending portion includes a first wide portion that is wider than the fourth extending portion. In the antenna device according to any one of claims 1 to 3,
The antenna device according to claim 6, wherein the sixth extending portion has a second wide portion that is wider than the seventh extending portion. In the antenna device according to any one of claims 1 to 4,
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 5,
A first passive element is connected to the first extension;
A second passive element is connected to the second extension part;
An antenna device, wherein a third passive element is connected to the sixth extending portion.