JP6098810B2 - Antenna device - Google Patents

Description

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

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

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

JP 2010-81000 A JP 2010-166287 A

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

  The present invention has been made in view of the above-mentioned problems, and can flexibly adjust each resonance frequency that has been double-resonated. It is an object of the present invention to provide an antenna device that can be thinned.

  The present invention employs the following configuration in order to solve the above problems. That is, the antenna device according to the first invention includes an insulating substrate body, and a ground pattern, a first element, a second element, and a third element, each of which is patterned with a metal foil on the surface of the substrate body. The first element has a first extending portion provided in a direction away from the ground pattern by providing a first feeding point on a proximal end side adjacent to the ground pattern, and a first extending portion of the first extending portion. A second extending portion extending from the tip along the ground pattern and connected to the first passive element in the middle, and a base end connected to the tip of the second extending portion and spaced apart from the ground pattern A third extension extending in the direction, and the second element extends in a direction away from the ground pattern with a base end connected to the middle of the second extension. And the part The second passive element and the first antenna element of the dielectric antenna are connected in this order along the second extending part from the distal end of the extending part toward the third extending part. The third element is provided with a second feeding point on the base end side close to the ground pattern, and a third passive element is connected to the first extension part. A sixth extending portion extending along the second extending portion, and extending along the second extending portion from the tip of the sixth extending portion toward the third extending portion, and in the middle of the dielectric antenna It has the 7th extension part to which the 2nd antenna element is connected, It is characterized by the above-mentioned.

In this antenna device, the first element has a third extending portion that is connected to the distal end of the second extending portion and extends in a direction away from the ground pattern, and the second element has the third extending portion. A loading element that does not self-resonate at a desired resonance frequency because it has a fifth extending portion that extends along the second extending portion toward the existing portion and is connected to the first antenna element in the middle. By effectively utilizing the stray capacitance between the first antenna element and each element or between the ground patterns, multiple resonances can be achieved.
Furthermore, the third element is provided with a second feeding point on the base end side close to the ground pattern, and a third passive element is connected in the middle to extend along the first extension part. And a seventh extension that extends along the second extension from the tip of the sixth extension toward the third extension and is connected to the second antenna element of the dielectric antenna in the middle. In addition to at least two resonance frequencies by the first element and the second element connected to the first feeding point, and at least one other element by the third element connected to the second feeding point. A resonance frequency is obtained. That is, by effectively using each antenna element of the loading element that does not self-resonate at a desired resonance frequency and each stray capacitance between each element and the ground pattern, the resonance frequency is made to be at least three resonance frequencies. be able to.
Specifically, the stray capacitance between the second extension portion and the ground pattern, the stray capacitance between the second extension portion and the fifth extension portion, the fifth extension portion and the third extension. Stray capacitance between the seventh extension portion and the ground pattern, and stray capacitance between the seventh extension portion and an element adjacent thereto can be generated. In addition, it is possible to obtain a high degree of freedom in adjustment at at least three resonance frequencies obtained mainly from at least the first element, the second element, and the third element. Can be planned.
In particular, since the third extending portion having a high impedance at the tip extends in a direction away from the ground pattern, the high-frequency current hardly flows to the ground pattern side, and the third extending portion and the fifth extending portion. The stray capacitance can be loaded between and the resonance frequency lower than the resonance frequency obtained mainly from the second element.
In addition, since the third element is connected to a feeding point different from the feeding point of the first element and the second element, the high-frequency current flowing between the elements is compared to the case where the third element is connected to the same feeding point. A high degree of freedom of adjustment can be obtained, and high performance (wideband) of each resonance frequency can be achieved.

Further, by selecting the antenna element and the 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, 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.
In addition, it is also possible to obtain another resonance frequency between the base end of the second extending portion and the first passive element by selecting the first passive element having high impedance.

An antenna device according to a second invention is the antenna device according to the first invention, wherein the third element has a base end connected to a tip of the seventh extension part via a fourth passive element, and the third extension part. It has the 8th extension part extended along the 7th extension part toward the other side, It is characterized by the above-mentioned.
That is, in this antenna device, the third element is connected to the distal end of the seventh extension part via the fourth passive element, and extends along the seventh extension part toward the opposite side of the third extension part. Since the eighth extending portion is extended, by selecting the fourth passive element having a high impedance, the eighth extending portion is separated from the resonance frequency obtained mainly by the seventh extending portion. Another resonance frequency can be obtained at the existing portion, and further double resonance can be achieved. Therefore, as the fourth passive element, one having a higher impedance at the resonance frequency obtained at the eighth extension than the resonance frequency obtained at the seventh extension is adopted.

The antenna device according to a third aspect of the present invention is the antenna device according to the first or second aspect, further comprising a fourth element patterned on the surface of the substrate body with a metal foil, wherein the fourth element is the third extension portion. A ninth extension portion connected to the second extension portion closer to the base end side than the connection portion of the first extension portion, extending in a direction away from the ground pattern, and connected to a fifth passive element; and And a tenth extending portion extending along the second extending portion from the tip of the extending portion toward the first antenna element.
That is, in this antenna device, the fourth element extends in a direction in which the base end is connected to the second extension portion on the base end side with respect to the connection portion of the third extension portion and is separated from the ground pattern, and the fifth element. A ninth extension portion connected to the passive element; and a tenth extension portion extending from the tip of the ninth extension portion toward the first antenna element along the second extension portion. Therefore, by utilizing the stray capacitance between other adjacent elements, it is possible to obtain another resonance frequency mainly for the fourth element. Therefore, multiple resonances having at least four resonance frequencies obtained mainly from the first element, the second element, the third element, and the fourth element can be realized. If there is sufficient space, it is possible to obtain a larger number of resonance frequencies by arranging a plurality of fourth elements in the middle of the second extending portion.

The present invention has the following effects.
According to the antenna device of the present invention, the first element has the second extension part and the third extension part, and the second element has the fifth extension part to which the first antenna element is connected. And the third element has a seventh extending portion to which the second antenna element is connected in the middle, so between the two antenna elements and the element, between each element and between the ground pattern A stray capacitance is generated between them, and a double resonance can be achieved with at least three resonance frequencies.
In particular, a stray capacitance can be loaded between the third extension part and the fifth extension part having a high impedance at the tip, and a resonance frequency lower than the resonance frequency obtained mainly from the second element can be obtained. it can.
Further, since the first element and the second element connected to the first feeding point and the third element connected to the second feeding point are provided, it is obtained as compared with the case where they are connected to the same feeding point. The resonance frequency can be widened.
Furthermore, by selecting the antenna element and the passive element, each resonance frequency can be adjusted flexibly, so that multiple resonances according to design conditions can be achieved, and miniaturization and high performance can be achieved.
Therefore, the antenna device of the present invention can easily achieve multiple resonances corresponding to various applications and devices, and can save space.

In one Embodiment of the antenna device which concerns on this invention, it is a top view which shows the positional relationship of each element. In this embodiment, it is a wiring diagram which shows the main area | regions which contribute to each resonance frequency. In this embodiment, it is a wiring diagram which shows the stray capacitance produced with an antenna apparatus. In this embodiment, they are a perspective view (a), a plan view (b), a front view (c), and a bottom view (d) showing a first antenna element. In this embodiment, they are a perspective view (a), a plan view (b), a front view (c), a bottom view (d), and a rear view (e) showing a second antenna element. In this embodiment, it is a graph which shows the VSWR characteristic (voltage standing wave ratio) at the time of making 4 resonance based on the electric power feeding from a 1st electric power feeding point. In this embodiment, it is a graph which shows the VSWR characteristic (voltage standing wave ratio) at the time of carrying out 2 resonance based on the electric power feeding from a 2nd electric power feeding point.

  Hereinafter, an embodiment of an antenna device according to the present invention will be described with reference to FIGS.

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

The first element 3 includes a first extending portion E1 provided with a first feeding point FP1 on the base end side close to the ground pattern GND and extending in a direction away from the ground pattern GND, and the first extension 3 A base end is connected to a second extending portion E2 extending from the tip of the portion E1 along the ground pattern GND and connected to the first passive element P1 in the middle, and a tip of the second extending portion E2. A third extending portion E3 extending in a direction away from the ground pattern GND.
In addition, a wide portion E2a that is formed wider than the intermediate portion (the intermediate portion on the tip side of the first passive element P1) is formed at the tip of the second extending portion E2.
The direction along the ground pattern GND is a direction along the end side of the opposing ground pattern GND.

The second element 4 includes a fourth extending portion E4 extending in a direction away from the ground pattern GND with a base end connected in the middle of the second extending portion E2, and a distal end of the fourth extending portion E4. The second passive element P2b, the second passive element P2a, and the first antenna element AT1 of the dielectric antenna are connected in this order along the second extending part E2 toward the third extending part E3. And a fifth extending portion E5.
That is, the tip end portion of the fifth extending portion E5 faces the third extending portion E3. The fourth extending portion E4 is connected to the second extending portion E2 on the proximal end side with respect to the first passive element P1. In addition, the front-end | tip part of the 5th extension part E5 is formed wider than the base end side.

  The third element 5 is provided with a second feeding point FP2 on the proximal end side close to the ground pattern GND, and is connected to the third passive elements P3a and P3b in the middle and extends along the first extending portion E1. And a second antenna of the dielectric antenna extending along the second extending portion E2 from the tip of the sixth extending portion E6 toward the third extending portion E3. A seventh extending portion E7 to which the element AT2 is connected, and a proximal end is connected to the distal end of the seventh extending portion E7 via the fourth passive element P4, toward the opposite side to the third extending portion E3. And an eighth extending portion E8 extending along the seventh extending portion E7. In other words, the eighth extending portion E8 extends from the seventh extending portion E7 with the fourth passive element P4 as a starting point.

  The fourth element 6 has a base end connected to the second extending portion E2 on the base end side of the connecting portion of the third extending portion E3 and extends in a direction away from the ground pattern GND, and is a fifth passive element. A ninth extending portion E9 to which P5a and P5b are connected, and a tenth extending portion extending along the second extending portion E2 from the tip of the ninth extending portion E9 toward the first antenna element AT1 E10.

A sixth passive element P6 is connected to the first extending portion E1 on the way.
The ground pattern GND has a ground protrusion G1 that protrudes toward the seventh extension E7 and extends along the first extension E1. The ground protruding portion G1 and the first extending portion E1 are connected by two seventh passive elements P7a and P7b arranged on both sides of the sixth passive element P6. That is, the sixth passive element P6 and the two seventh passive elements P7a and P7b constitute a π-type impedance adjustment circuit unit.
Note that the base end of the sixth extending portion E6 is connected to the ground protruding portion G1 through the eighth passive element P8 as necessary.

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 first feeding point FP1 and the second feeding point FP2 are each connected to a feeding point of a high-frequency circuit (not shown). A high frequency circuit is mounted in the area of the ground pattern GND.
For example, an inductor, a capacitor, a resistor, or a jumper line is used as each passive element.

The first antenna element AT1 is a loading element that does not self-resonate at a desired resonance frequency. For example, as shown in FIG. 4, a chip in which a conductor pattern 22 such as Ag is formed on the surface of a dielectric 21 such as ceramics. It is an antenna.
The second antenna element AT2 is a loading element that does not self-resonate at a desired resonance frequency. For example, as shown in FIG. 5, a conductor pattern 32 such as Ag is formed on the surface of a dielectric 31 such as ceramic. Chip antenna.
The first antenna element AT1 and the second antenna element AT2 may select elements having different lengths, widths, conductor patterns, and the like according to the setting of the resonance frequency and the like. It doesn't matter. Depending on the desired frequency, the dielectric used in the first antenna element AT1 and the second antenna element AT2 may be a magnetic material or a composite material in which a dielectric and a magnetic material are mixed.

The first element 3, the second element 4, the third element 5, and the fourth element 6 are spaced apart from each other so that a stray capacitance between them and a stray capacitance between the ground pattern GND can be generated. It is extended.
That is, as shown in FIG. 3, the stray capacitance Ca between the fifth extending portion E5 and the third extending portion E3, the stray capacitance Cb between the wide portion E2a and the ground pattern GND, and the wide portion E2a. The stray capacitance Cc between the second extending portion E2 and the ground pattern GND closer to the first passive element P1 and the second extending portion E2 on the proximal end side from the first passive element P1 The stray capacitance Cd between the ground pattern GND, the stray capacitance Ce between the tip of the fifth extension E5 and the second extension E2, the first antenna element AT1 and the second extension E2. The stray capacitance Cf, the stray capacitance Cg between the base end side of the fifth extension portion E5 and the second extension portion E2, and the base end side of the tenth extension portion E10 and the second extension portion E2 Between the stray capacitance Ch between the leading end side (first antenna element AT1 side) of the tenth extending portion E10 and the fifth extending portion E5. Stray capacitance C i, stray capacitance C j between the eighth extension portion E 8 and the tenth extension portion E 10, stray capacitance C k between the seventh extension portion E 7 and the eighth extension portion E 8, A stray capacitance Cl between the seventh extending portion E7 and the second extending portion E2 and a stray capacitance Cm between the second antenna element AT2 and the ground protruding portion G1 can be generated.

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

In the antenna device 1 of the present embodiment, as shown in FIGS. 6 and 7, the first resonance frequency f1, the second resonance frequency f2, the third resonance frequency f3, and the fourth resonance are started from the lowest frequency. Multiple resonances are made in six frequency bands in the order of the frequency f4, the fifth resonance frequency f5, and the sixth resonance frequency f6.
The first resonance frequency f1 is determined by the first element 3, the first passive element P1, and the stray capacitance, and the second resonance frequency f2 is determined by the second element 4, the first antenna element AT1, and the first element. 2 is determined by the passive elements P2a and P2b and the stray capacitance. The third resonance frequency f3 is determined by the third element 5, the third passive elements P3a and P3b, the fourth passive element P4, and the stray capacitance, and the fourth resonance frequency f4 is the fourth resonance frequency f4. It is determined by the element 6, the fifth passive elements P5a and P5b, and the stray capacitance. Furthermore, the fifth resonance frequency f5 is determined by the base end side and the stray capacitance with respect to the first passive element P1 of the second extending portion E2. The first passive element P1 is set to have a high impedance at this frequency. The sixth resonance frequency f6 is determined by the seventh extending portion E7 of the third element 5, the second antenna element AT2, the third passive elements P3a and P3b, 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 first passive element P1, and the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf, Cg, and Ch.
Moreover, the impedance adjustment of the first resonance frequency f1 can be performed by setting each of the stray capacitances Ca, Cb, Cc, Cd, Ce, and Ch.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the first passive element P1.
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 is the second element 4, the first antenna element AT1, the second passive element P2a. It can be set and adjusted by P2b and stray capacitances Ca, Ce, Cf, Cg, and Ci.
The impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Ca, Ce, Cf, Cg, and Ci.
Further, the final frequency adjustment can be flexibly performed by selecting the second passive elements P2a and P2b.
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 is set and adjusted by the third element 5, the second antenna element AT2, the fourth passive element P4, the third passive elements P3a, P3b, and the stray capacitances Cj, Cl, Cm, Ck. be able to.
Further, the impedance adjustment of the third resonance frequency f3 can be performed by setting each of the stray capacitances Cj, Cl, Cm, and Ck.
Further, the final frequency adjustment can be flexibly performed by selecting the third passive elements P3a and P3b.
In this way, the third resonance frequency f3 is adjusted mainly at the portion of the alternate long and short dash 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 fourth element 6, the fifth passive elements P5a, P5b, and the stray capacitances Ch, Ci, Cj.
Further, the impedance adjustment of the fourth resonance frequency f4 can be performed by setting each of the stray capacitances Ch, Ci, and Cj.
Further, the final frequency adjustment can be flexibly performed by selecting the fifth passive elements P5a and P5b.
In this way, the fourth resonance frequency f4 is adjusted mainly at the portion of the broken line A4 in FIG.

“Fifth resonance frequency f5”
The frequency of the fifth resonance frequency f5 can be set and adjusted by the base end side and the stray capacitances Cd and Ch from the first passive element P1 of the second extending portion E2.
The impedance adjustment of the fifth resonance frequency f5 can be performed by setting the stray capacitances Cd and Ch.
In this way, the fifth resonance frequency f5 is adjusted mainly at the portion of the two-dot chain line A5 in FIG.

“About the sixth resonance frequency f6”
The frequency of the sixth resonance frequency f6 can be set and adjusted by the seventh extending portion E7, the second antenna element AT2, the third passive elements P3a and P3b, and the stray capacitances Cl, Cm, and Ck.
The impedance adjustment of the sixth resonance frequency f6 can be performed by setting each of the stray capacitances Cl, Cm, and Ck.
Further, the final frequency adjustment can be flexibly performed by selecting the third passive elements P3a and P3b.
Thus, the sixth resonance frequency f6 is adjusted mainly at the portion indicated by the broken line A6 in FIG.

  The final impedance adjustment at the resonance frequencies f1, f2, f4, and f5 is performed by controlling the flow of the high-frequency current flowing to the ground pattern GND side by selecting the sixth passive element P6 and the seventh passive elements P7a and P7b. It can be done flexibly. The final impedance adjustment at the resonance frequencies f3 and f6 can be flexibly performed by controlling the flow of the high-frequency current flowing to the ground pattern GND side by selecting the eighth passive element P8.

  As described above, in the antenna device 1 according to the present embodiment, the first element 3 has the third extending portion E3 extending in the direction away from the ground pattern GND with the proximal end connected to the distal end of the second extending portion E2. And the second element 4 extends along the second extending portion E2 toward the third extending portion E3, and has a fifth extending portion E5 to which the first antenna element AT1 is connected midway. Therefore, by effectively using the first antenna element AT1, which is a loading element that does not self-resonate at a desired resonance frequency, and each stray capacitance between the elements and the ground pattern GND, multiple resonance can be achieved. Can be made.

Further, the third element 5 is provided with the second feeding point FP2 on the proximal side close to the ground pattern GND, and the third passive elements P3a and P3b are connected in the middle to extend along the first extending portion E1. A sixth extending portion E6, and a second extending portion of the dielectric antenna extending along the second extending portion E2 from the tip of the sixth extending portion E6 toward the third extending portion E3. In addition to the seventh extending portion E7 to which the antenna element AT2 is connected, in addition to at least two resonance frequencies by the first element 3 and the second element 4 connected to the first feeding point FP1, Another third resonance frequency is obtained by the third element 5 connected to the two feeding points FP2. In other words, by effectively using each antenna element of the loading element that does not self-resonate at a desired resonance frequency and each stray capacitance between each element and between the ground pattern GND, double resonance is achieved at least at three resonance frequencies. Can be made.
In this way, a high degree of freedom of adjustment can be obtained at at least three resonance frequencies obtained mainly from at least the first element 3, the second element 4, and the third element 5, and the antenna performance and the influence of the human body and peripheral parts can be obtained. It is possible to achieve a balance with the reduction.

In particular, the third extending portion E3 having a high impedance at the tip extends in a direction away from the ground pattern GND, so that it is difficult for a high-frequency current to flow to the ground pattern GND side, and the third extending portion E3 and the third extending portion E3 The stray capacitance Ca can be loaded between the five extending portions E5, and a resonance frequency lower than the resonance frequency obtained mainly from the second element 4 can be obtained.
Further, since the third element 5 is connected to a feeding point FP2 that is different from the feeding point FP1 of the first element 3 and the second element 4, compared to the case where the third element 5 is connected to the same feeding point, between each element. In addition, a high degree of freedom of adjustment can be obtained for the high-frequency current flowing through the resonance frequency, and high performance (broadband) of each resonance frequency can be achieved.

Moreover, it is also possible to obtain another resonance frequency between the base end of the second extending portion E2 and the first passive element P1 by selecting the first passive element P1 having a high impedance. .
As described above, the passive element selected to have a high impedance is a passive element (first passive element P1 of the present embodiment) used for the lowest resonance frequency (first resonant frequency f1 in the present embodiment). desirable. Further, it is desirable that the passive element has a high impedance with respect to a desired resonance frequency (the above-described another resonance frequency: the fifth resonance frequency f5). This is because, even when the impedance becomes high with respect to the desired resonance frequency, a good impedance can be secured with respect to the lowest resonance frequency. For this reason, in this embodiment, the first passive element P1 is set to have a high impedance selection.

  Further, by selecting each antenna element and each passive element, it is possible to flexibly adjust each resonance frequency and 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 performed within 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 each antenna element that is a dielectric antenna can be 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.

  Further, the third element 5 is connected to the distal end of the seventh extending portion E7 via the fourth passive element P4, and along the seventh extending portion E7 toward the opposite side to the third extending portion E3. In addition to the resonance frequency obtained mainly at the seventh extending portion E7, by selecting the fourth passive element P4 having a high impedance, the eighth extending portion E8 has the eighth extending portion E8. Another resonance frequency can be obtained at the eighth extending portion E8, and further double resonance can be achieved. Therefore, as the fourth passive element P4, one having a higher impedance at the resonance frequency obtained at the eighth extending portion E8 than the resonance frequency obtained at the seventh extending portion E7 is employed.

  Further, the fourth element 6 extends in a direction in which the base end is connected to the second extending portion E2 closer to the base end side than the connecting portion of the third extending portion E3 and is separated from the ground pattern GND, and the fifth passive element A ninth extension E9 to which the elements P5a and P5b are connected, and a tenth extension extending along the second extension E2 from the tip of the ninth extension E9 toward the first antenna element AT1 Since the portion E10 is provided, it is possible to obtain a different resonance frequency mainly for the fourth element 6 by utilizing the stray capacitance between the other adjacent elements. Therefore, multiple resonances having at least four resonance frequencies obtained mainly from the first element 3, the second element 4, the third element 5, and the fourth element 6 are possible. If there is sufficient space, it is possible to obtain more resonance frequencies by arranging a plurality of fourth elements 6 in the middle of the second extending portion E2.

  Further, since the wide portion E2a formed wider than the middle portion is formed at the tip of the second extending portion E2, the stray capacitance Cb between the tip of the second extending portion E2 and the ground pattern GND is reduced. By increasing the size and reducing the impedance of the tip of the second extending portion E2, the influence of the stray capacitance Cf between the intermediate portion of the second extending portion E2 and the ground pattern GND is suppressed, and the high frequency flowing to the ground pattern GND side Current can be suppressed. In addition, since the front-end | tip of the 3rd extension part E3 is high impedance, the 1st element 3 whole can maintain high impedance.

  Next, when the antenna device of the present embodiment was actually manufactured, when the four resonances were made based on the feeding from the first feeding point and when the two resonances were made based on the feeding from the second feeding point FIG. 6 and FIG. 7 show the results of measuring the VSWR characteristics (voltage standing wave ratio).

In the measurements of FIGS. 6 and 7, the following passive elements were used.
First passive element P1: Inductor with L = 20 nH Second passive element P2a: Inductor with L = 3.3 nH Second passive element P2b: Inductor with L = 10 nH Third passive element P3a: Inductor third with L = 1.0 nH Passive element P3b: Inductor with L = 2.7nH Fourth passive element P4: Inductor with L = 15nH Fifth passive element P5a: Inductor with L = 4.7nH Fifth passive element P5b: Inductor with L = 5.6nH Passive element P6: Inductor seventh passive element P7a: L = 1.0 nH Inductor seventh passive element P7b: L = 6.8 nH Inductor seventh passive element P7: Capacitor eighth passive element P8: C = 1.0 pF: Not mounted

As can be seen from the measurement results, the first to sixth resonance frequencies f1 to f6 are obtained with a good bandwidth as shown in Table 1 below. In particular, by dividing the feeding point into two, a wide bandwidth is obtained at the third resonance frequency f3 and the sixth resonance frequency f6 obtained by the third element. The frequency band of the first resonance frequency f1 is 740 MHz, the frequency band of the second resonance frequency f2 is 893 MHz, the frequency band of the third resonance frequency f3 is 1530 MHz, the frequency band of the fourth resonance frequency f4 is 1990 MHz, The fifth resonance frequency band is 2400 MHz, and the frequency band of the sixth resonance frequency f6 is 2655 MHz.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, the antenna elements are provided in the second element and the third element. However, the antenna elements are provided in the tenth extending portion of the fourth element to shorten each element, and the entire apparatus The size may be reduced.
On the contrary, when there is a margin in the substrate size, a part of the element may be replaced with a pattern of a shape obtained by folding a linear or plate-like metal. 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 apparatus, 2 ... Board | substrate main body, 3 ... 1st element, 4 ... 2nd element, 5 ... 3rd element, 6 ... 4th element, AT1 ... 1st antenna element, AT2 ... 2nd antenna element, E1 ... 1st extension part, E2 ... 2nd extension part, E2a ... Wide part, E3 ... 3rd extension part, E4 ... 4th extension part, E5 ... 5th extension part, E6 ... 6th extension part , E7 ... seventh extension, E8 ... eighth extension, E9 ... ninth extension, E10 ... tenth extension, GND ... ground pattern, G1 ... ground protrusion, P1 ... first passive element , P2a. P2b ... second passive element, P3a, P3b ... third passive element, P4 ... fourth passive element, P5a, P5b ... fifth passive element, P6 ... sixth passive element, P7a, P7b ... seventh passive element, P8 ... Eighth passive element, FP1 ... first feeding point, FP2 ... second feeding point

Claims (3)

An insulating substrate body;
A ground pattern, a first element, a second element, and a third element each formed by patterning a metal foil on the surface of the substrate body;
The first element is provided with a first feeding point on a proximal end side close to the ground pattern, and extends in a direction away from the ground pattern, and a distal end of the first extending part A second extending portion that extends along the ground pattern and is connected to the first passive element in the middle thereof, and a direction in which a base end is connected to a distal end of the second extending portion and is separated from the ground pattern A third extending portion extending to
The second element includes a fourth extension portion extending in a direction away from the ground pattern with a base end connected in the middle of the second extension portion, and a third extension portion from the tip of the fourth extension portion. A fifth extending portion that extends along the second extending portion toward the extending portion and that is connected to the second passive element and the first antenna element of the dielectric antenna in this order. ,
A sixth extension in which the third element is provided with a second feeding point on a proximal end side adjacent to the ground pattern, and a third passive element is connected in the middle to extend along the first extension portion. And a second antenna element connected to the second antenna element of the dielectric antenna in the middle extending from the tip of the sixth extension part toward the third extension part along the second extension part. 7. An antenna device having an extending portion. The antenna device according to claim 1,
The third element has a proximal end connected to a distal end of the seventh extending portion via a fourth passive element, and extends along the seventh extending portion toward the opposite side to the third extending portion. An antenna device comprising an eighth extending portion. In the antenna device according to claim 1 or 2,
Comprising a fourth element patterned with a metal foil on the surface of the substrate body;
The fourth element has a base end connected to the second extension portion closer to the base end side than the connection portion of the third extension portion and extends in a direction away from the ground pattern, and a fifth passive element A connected ninth extension;
An antenna device comprising: a tenth extending portion extending along the second extending portion from the tip of the ninth extending portion toward the first antenna element.