JP2013225735A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device capable of flexibly adjusting resonant frequencies which are made into double resonance.SOLUTION: An antenna device comprises a substrate body, a ground pattern GND which is formed on a surface of the substrate body, a first extension part E1, a second extension part E2, a third extension part E3 and a fourth extension part E4. In the first extension part E1, a first element 3 and a second element 4 are provided, the first element extends while providing a feed point FP at a proximal end side and connecting first passive elements P1a, P1b and an antenna element AT thereto, the second element extends along the first element while connecting the proximal end thereof to the ground pattern, and the first element extends along the ground pattern from the proximal end thereof to the first passive elements. The second extension part E2 extends from the first passive elements in an extending direction of the first extension part while disposing the antenna element AT in the middle. The third extension part E3 extends from a distal end of the second extension part. The fourth extension part E4 extends from a distal end of the third extension part along the second extension part and connects the distal end thereof to the first extension part.

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, and a ground pattern, a first element, and a second element each formed by patterning a metal foil on the surface of the substrate body, The element is provided with a feeding point on the proximal end side adjacent to the ground pattern, and the first passive element and the antenna element of the dielectric antenna are connected in this order in the middle and extend in the direction along the ground pattern. The second element has a proximal end connected to the ground pattern and a second passive element connected midway, and extends along the first element between the ground pattern and the first element. The first element extends from the base end to the first passive element along the ground pattern; and the first receiving portion. A second extending portion extending in the extending direction of the first extending portion by arranging the antenna element halfway from an element; and extending from the tip of the second extending portion toward the second element side. A third extension portion, and a tip extending from the tip of the third extension portion between the second extension portion and the second element and extending along the second extension portion. It has the 4th extension part connected to the 1st extension part, It is characterized by the above-mentioned.

In this antenna device, the first element includes a second extending portion extending in the extending direction of the first extending portion by arranging the antenna element in the middle from the first passive element, and the second extending portion. A third extending portion extending from the tip toward the second element side, and between the second extending portion and the second element from the tip of the third extending portion and along the second extending portion The first to fourth extending portions connected in a ring form an effective stray capacitance inside and outside. The load pattern that can be generated in the first element can be formed on the open end portion of the first element. In other words, since this loading pattern becomes the open end portion of the antenna element, the influence of the surrounding human body and peripheral parts is suppressed and deterioration of the antenna performance is prevented as compared with the case where the antenna element having high impedance becomes the open end. be able to.
Specifically, the stray capacitance between the fourth extension portion and the second element, the stray capacitance between the fourth extension portion and the ground pattern, and the inside of the loading pattern (the second extension portion and the second element). 4) and the stray capacitance between the antenna element and the ground pattern can be generated, and at least the resonance frequency obtained mainly from the first element and the second element can be obtained. It is possible to obtain a high degree of freedom in adjustment at each resonance frequency with respect to the resonance frequency, and to achieve both the antenna performance and the reduction of the influence of the human body and peripheral parts.
Therefore, by effectively utilizing the internal and external combined stray capacitance due to the loading pattern having the loading element antenna element that does not self-resonate at a desired resonance frequency, it is possible to achieve multiple resonances, It is also possible to reduce the influence.
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.

An antenna device according to a second invention includes, in the first invention, a third element that is patterned with a metal foil on the surface of the substrate body, and the first element is in the middle of the first extension portion. A fifth extending portion for connecting to the ground pattern, wherein the third element has one end connected to a tip end side of the first extending portion and the other end connected in the middle of the second element; The first extending portion, the fifth extending portion, the ground pattern, the second element, and the third element are connected in a ring shape to form an opening inside. To do.
That is, in this antenna device, the first extending portion, the fifth extending portion, the ground pattern, the second element, and the third element are connected in an annular shape to form an opening on the inner side. Thus, stray capacitance can be generated, and further double resonance can be achieved with different resonance frequencies, and the influence of the human body and peripheral parts can be reduced. Further, due to the stray capacitance generated in the opening, it is possible to reduce the influence of the human body and peripheral parts on the two resonance frequencies of the first element and the second element.

An antenna device according to a third invention is the antenna device according to the first or second invention, further comprising a fourth element patterned on the surface of the substrate body with a metal foil, and the fourth element is a base of the first element. It is connected to the end side and extends along the first extending portion on the side opposite to the ground pattern.
That is, in this antenna device, since the fourth element is connected to the base end side of the first element and extends along the first extending portion on the side opposite to the ground pattern, the fourth element and the first element By effectively utilizing the stray capacitance between the elements, it is possible to make multiple resonances with different resonance frequencies.

The antenna device according to a fourth invention is characterized in that, in any one of the first to third inventions, the second extension part and the fourth extension part are longer than the third extension part. .
That is, in this antenna device, since the second extending portion and the fourth extending portion are longer than the third extending portion, the composite stray capacitance generated inside and outside the loading pattern can be obtained more effectively, and the human body and The influence of peripheral parts can be further reduced.

An antenna device according to a fifth aspect of the present invention is the antenna device according to any one of the first to fourth aspects, wherein the main body portion electrically connected to the ground pattern is patterned with a metal foil on the surface. A main board is provided.
That is, in this antenna device, the main ground part electrically connected to the ground pattern is provided with a main board having a pattern formed of a metal foil on the surface, so that a high frequency circuit or the like is provided on the main ground part side of the main board. The substrate body can be downsized. In addition, it is possible to install the board body above the main board, and the degree of freedom of installation in the housing of the device is improved. Furthermore, in order to respond flexibly to the arrangement conditions of the housing to be mounted, it is possible to employ a flexible substrate or the like for the substrate body separately from the main substrate. In addition, a spacer made of a high dielectric constant material or a rubber material can be inserted between the substrate body and the main substrate, so that the effect of reducing the size of the conductor pattern (each element) and the impact absorption effect can be obtained.

The present invention has the following effects.
According to the antenna device of the present invention, the first to fourth extending portions connected in a ring form a loading pattern capable of effectively generating stray capacitance inside and outside at the open end portion of the first element. It is possible to achieve multiple resonance with high antenna performance, and to reduce the influence of the human body and peripheral parts.
In addition, by selecting the antenna element and the first and second passive elements, each resonance frequency can be flexibly adjusted, making it possible to achieve multiple resonances according to design conditions, as well as miniaturization and high performance. Become.
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 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 an antenna element. In this embodiment, it is a simplified sectional view showing an antenna device. In this embodiment, it is a graph which shows the VSWR characteristic (voltage standing wave ratio) at the time of making 4 resonance in a free space state and a human body wearing state. In this embodiment, it is a graph which shows the radiation pattern of an antenna device.

  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.

In addition, the antenna device 1 includes a main substrate 2B in which a main ground portion G2 electrically connected to the ground pattern GND by a connection wiring 11 is patterned with a metal foil such as a copper foil on the surface.
As shown in FIG. 4, the substrate body 2 is installed above the main substrate 2B, and an insulating property formed of a general resin such as ABS is provided between the substrate body 2 and the main substrate 2B. A spacer S is inserted. The main ground portion G2 is also provided directly below the substrate body 2.

The first element 3 is provided with a feeding point FP on the base end side close to the ground pattern GND, and two first passive elements P1a and P1b and a dielectric antenna antenna element AT are connected in this order. Extending in a direction along the ground pattern GND. Here, in the present embodiment, the direction along the ground pattern GND is a direction along the extending side of the ground pattern GND and along the end side of the opposing ground pattern GND. In the case where the antenna device is integrally formed on the main substrate, and the ground pattern GND is shared with the main ground portion G2 formed with a larger area than the antenna occupation region, the direction along the ground pattern GND Is a direction along the end side of the main ground portion G2 to be the opposing ground pattern GND.
The second element 4 has a base end connected to the front end side of the ground pattern GND, and two second passive elements P2a and P2b connected in the middle to connect the second pattern 4 between the ground pattern GND and the first element 3. It extends along one element 3.

The first element 3 includes a first extending portion E1 extending along the ground pattern GND from the base end to the first passive element P1a, and the first passive element P1a to the first passive element P1b and the antenna element AT. A second extending portion E2 extending in the extending direction of the first extending portion E1, and a third extending extending from the tip of the second extending portion E2 toward the second element 4 side The extending portion E3 extends between the second extending portion E2 and the second element 4 from the tip of the third extending portion E3 and extends along the second extending portion E2, and the leading end of the first extending portion. And a fourth extending portion E4 connected to the portion E1. That is, a loading pattern capable of effectively generating stray capacitance inside and outside is configured in the open end portion of the first element 3 by the first to fourth extending portions E1 to E4 connected in a ring shape.
The third extending portion E3 extends in a direction orthogonal to the extending direction of the second extending portion E2 and the fourth extending portion E4, and the second extending portion E2 and the fourth extending portion E4 are , Longer than the third extending portion E3.

The first element 3 has a fifth extending portion E5 that connects the middle of the first extending portion E1 and the ground pattern GND. The fifth extending portion E5 extends toward the ground pattern GND from the middle of the first extending portion E1, and is connected to the middle of the ground pattern GND via the third passive element P3.
The third element 5 has one end connected to the distal end side of the first extending portion E <b> 1 and the other end connected to the middle of the second element 4. That is, the other end of the third element 5 is connected between the second passive element P2a and the second passive element P2b. A passive element may be connected to the third element 5 portion.
Therefore, the first extending portion E1, the fifth extending portion E5, the ground pattern GND, the second element 4, and the third element 5 are connected in a ring shape to form the opening K inside.

The fourth element 6 is connected to the base end side of the first element 3 via a fourth passive element P4 and extends along the first extending portion E1 on the side opposite to the ground pattern GND.
The distal end side of the first extending portion E1 is a wide portion E1a formed wider than the proximal end side, and the distal end of the fourth element 6 is arranged to face the wide portion E1a. The wide end E1a is connected to the tip end of the fourth extending portion E4 and to the third element 5.

The board body 2 and the main board 2 are general printed boards, and in the present embodiment, printed boards made of glass epoxy resin or the like are employed.
The feeding point FP is connected to a high frequency circuit (not shown) provided in the main ground portion G2 of the main board 2B.

  The antenna element AT is a loading element that does not self-resonate at a desired resonance frequency. For example, as shown in FIG. 3, the antenna element AT is a chip antenna in which a conductor pattern 22 such as Ag is formed on the surface of a dielectric 21 such as ceramics. is there. As the antenna element AT, elements having different lengths, widths, conductor patterns 22 and the like may be selected according to the setting of the resonance frequency or the like, and the same element may be selected.

The first element 3, the second element 4, and the fourth element 6 extend at a distance from each other so as to generate a stray capacitance between them and a stray capacitance between the ground pattern GND. Yes.
That is, as shown in FIG. 2, the stray capacitance Ca between the fourth extending portion E4 and the second element 4, the stray capacitance Cb between the fourth extending portion E4 and the ground pattern GND, and the loading pattern , The stray capacitance Cc between the second extending portion E2 and the fourth extending portion E4, the stray capacitance Cd between the antenna element AT, the ground pattern GND, and the main ground portion G2, and the fourth element. 6, the stray capacitance Ce between the first element 3 (wide portion E1a), the stray capacitance Cf between the fourth element 6 and the first extension E1, the stray capacitance Cg in the opening K, The stray capacitance Ch between the fourth element 6 and the ground pattern GND and the main ground portion G2, the stray capacitance Ci between the first extending portion E1 and the ground pattern GND, the second element 4 and the ground pattern GND. Floating between And a capacity Cj can be generated.

  For the first passive elements P1a and P1b and the second passive elements P2a and P2b to the fourth passive element P4, for example, jumper wires, inductors, capacitors, or resistors are employed.

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

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, the third resonance frequency f3, and the fourth resonance frequency f4 are double-resonated. Is done.
The first resonance frequency f1 is in a low frequency band among the four resonance frequencies, and the first element 3 (the first extension portion E1 and the first to fourth extension portions E1 to E1 serving as a loading pattern). E4) and stray capacitance. The second resonance frequency f2 is an intermediate frequency band among the four resonance frequencies, and the second element 4, the first passive elements P1a and P1b, the first extending portion E1, the stray capacitance, Determined by The third resonance frequency f3 has an intermediate frequency band different from the second resonance frequency f2 among the four resonance frequencies, and the opening K, the second passive elements P2a and P2b, and the ground pattern GND. And stray capacitance. Further, the fourth resonance frequency f4 is in a high frequency band among the four resonance frequencies, and the second element 4, the second passive elements P2a and P2b, the first extending portion E1, and the stray capacitance are used. It is determined.

Further, final impedance adjustment is performed for each resonance frequency by controlling the flow of the high-frequency current flowing on the ground pattern GND side using the third passive element P3.
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 a first extending portion E1 including a loading pattern (second to fourth extending portions E2 to E4, antenna element AT, first passive elements P1a and P1b), and a wide portion E1a. And can be set and adjusted by 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 first passive elements P1a and P1b.
The final impedance adjustment can be flexibly performed by selecting the third passive element P3.
As described above, the resonance frequency and impedance can be flexibly adjusted by the “antenna element AT”, “the length of each element length”, and “passive element”. That is, the first resonance frequency f1 is adjusted mainly at the portion indicated by the broken line A1 in FIG.

“About the second resonance frequency f2”
The frequency of the second resonance frequency f2 can be set and adjusted by the fourth element 6, the first extension E1, and the stray capacitances Ce, Cf, Ch.
Further, the impedance adjustment of the second resonance frequency f2 can be performed by setting each of the stray capacitances Ce, Cf, and Ch.
Furthermore, the final frequency adjustment can be flexibly performed by selecting the fourth passive element P4.

The final impedance adjustment can be flexibly performed by selecting the third passive element P3.
In this way, the resonance frequency and impedance can be flexibly adjusted by the “fourth element”, “each element length”, “passive element”, and “each stray capacitance”. That is, the second resonance frequency f2 is adjusted mainly at the portion of the dashed-dotted 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 extending portion E1 and the stray capacitances Cf, Cg, and Ci.
Further, the impedance adjustment of the third resonance frequency f3 can be performed by setting each of the stray capacitances Cf, Cg, and Ci.
Further, the final frequency adjustment can be flexibly performed by selecting the second passive element P2a.

The final impedance adjustment can be flexibly performed by selecting the third passive element P3.
In this way, the resonance frequency and impedance can be flexibly adjusted by “each element length”, “passive element”, and “each stray capacitance”. That is, the third resonance frequency f3 is adjusted mainly at a portion indicated by a two-dot chain 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 second element 4, the first extension E1, and the stray capacitances Ca, Cb, Cf, Cg, and Cj.
Further, the impedance adjustment of the fourth resonance frequency f4 can be performed by setting each of the stray capacitances Ca, Cb, Cf, Cg, and Cj.
Further, the final frequency adjustment can be flexibly performed by selecting the second passive elements P2a and P2b.

The final impedance adjustment can be flexibly performed by selecting the third passive element P3.
Thus, the resonance frequency and impedance can be flexibly adjusted by the “second element 4”, “each element length”, “passive element”, and “each stray capacitance”. That is, the fourth resonance frequency f4 is adjusted mainly at the portion indicated by the dotted line A4 in FIG.

Next, the loading pattern portion will be described.
The loading pattern is provided on the distal end side of the first extending portion E1 and is configured in a loop shape by the first extending portion E1 to the fourth extending portion E4, and a composite capacity is provided to the open end portion of the first element 3. Designed to load.
The fourth extending portion E4 is disposed so as to be able to generate the stray capacitance Ca between the second element 4 and is configured to load the composite capacitance with respect to the fourth resonance frequency f4 by the second element 4 as well. Is desirable.
Further, in order to achieve both the antenna performance and the reduction in the influence of the human body and peripheral parts, it is better that the area of the loading pattern is larger. In addition, if it is the same area, it is desirable to set the length of the 2nd extension part E2 and the 4th extension part E4 longer than the length of the 3rd extension part E3.

Next, the opening K will be described.
The opening K is configured to be surrounded by the first extending portion E1, the fifth extending portion E5, the third passive element P3, the ground pattern GND, the second element 4, the second passive element P2a, and the third element 5. ing. The stray capacitance Cg generated in the opening K can reduce the influence of the human body and peripheral parts. The opening K also affects the human body and peripheral components due to the same stray capacitance effect on the first resonance frequency f1 due to the loaded pattern portion and the fourth resonance frequency f4 due to the second element 4. It becomes possible to reduce.
In order to improve the performance of the antenna, it is desirable that the opening area of the opening K is wide, and it is desirable that the third passive element P3 has a high impedance with respect to a desired resonance frequency.

  As described above, in the antenna device 1 of the present embodiment, the first element 3 has the second extension that extends in the extending direction of the first extending portion E1 by arranging the antenna element AT from the first passive element P1a. The extending portion E2, the third extending portion E3 extending from the tip of the second extending portion E2 toward the second element 4 side, and the second extending portion E2 from the tip of the third extending portion E3 And the second element 4 and has a fourth extending portion E4 extending along the second extending portion E2 and having a tip connected to the first extending portion E1. A loading pattern capable of effectively generating stray capacitance inside and outside can be formed in the open end portion of the first element 3 by the first to fourth extending portions E1 to E4 connected to the first and third extending portions E1 to E4.

That is, the loading pattern becomes the open end portion of the antenna element (first element 3), thereby suppressing the influence of the surrounding human body and peripheral parts compared to the case where the antenna element AT having high impedance becomes the open end. Antenna performance can be prevented.
In this way, by effectively using the internal and external stray capacitance due to the loading pattern having the antenna element AT of the loading element that does not self-resonate at a desired resonance frequency, it is possible to achieve multiple resonance, It is also possible to reduce the influence of peripheral parts.

  Further, by selecting the antenna element AT and the passive element, it is possible to flexibly adjust each resonance frequency, and it is possible to obtain an antenna device that can achieve 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 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 by selecting an antenna element which is a dielectric antenna. , Downsizing 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, since the first extending portion E1, the fifth extending portion E5, the ground pattern GND, the second element 4 and the third element 5 are connected in a ring to form the opening K inside, the opening The stray capacitance Cg can be generated in the portion K, and further double resonance can be achieved with another resonance frequency f3, and the influence of the human body and peripheral parts can be reduced. In addition, due to the stray capacitance Cg generated in the opening K, it is possible to reduce the influence of the human body and peripheral components on the first and fourth resonance frequencies f1 and f4.

Further, since the fourth element 6 is connected to the base end side of the first element 3 and extends along the first extending portion E1 on the side opposite to the ground pattern GND, the fourth element 6 and the first element 6 By effectively using the stray capacitance between the element 3 and the first and fourth resonance frequencies f1 and f4, a further multiple resonance can be achieved with a resonance frequency f2.
In addition, since the second extending portion E2 and the fourth extending portion E4 are longer than the third extending portion E3, the composite stray capacitance generated inside and outside the loading pattern can be obtained more effectively, and the human body and peripheral parts Can be further reduced.

  Further, since the main ground portion G2 electrically connected to the ground pattern GND is provided with the main substrate 2B patterned on the surface with metal foil, a high frequency circuit or the like is provided on the main ground portion G2 side of the main substrate 2B. The substrate body 2 can be reduced in size. Moreover, it becomes possible to install the board body 2 above the main board 2B, and the degree of freedom of installation in the housing of the device is improved. Furthermore, in order to flexibly cope with the arrangement conditions of the housing to be mounted, it is possible to adopt a flexible substrate or the like for the substrate body 2 separately from the main substrate 2B. In addition, it is possible to insert a spacer made of a high dielectric constant material or rubber material between the substrate body 2 and the main substrate 2B, so that a conductor pattern (each element) can be miniaturized and an impact absorbing effect can be obtained. it can.

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

First, the VSWR characteristics for a case where the human body and surrounding parts are in a free space state and a case where the human body is virtually attached to a plastic bottle containing physiological saline having the same salt concentration as the human body. The results of measuring (voltage standing wave ratio) are shown in FIG.
In the measurement of FIG. 5, an inductor with L = 1.5 nH was used as the first passive element P1a, and an inductor with L = 20 nH was used as the first passive element P1b. Further, a jumper line was used as the second passive element P2a, and an inductor of L = 10 nH was used as the second passive element P2b. Further, a capacitor of C = 2 pF was used as the third passive element P3, and an inductor of L = 5.6 nH was used as the fourth passive element P4.

As can be seen from this measurement result, even when the first to fourth resonance frequencies f1 to f4 obtained in the free space state are in the human body wearing state, the change in the resonance frequency is small and the fluctuation is suppressed. I understand that.
Typically, the case of the first resonance frequency f1 in the 900 MHz band and the second resonance frequency f2 in the 1800 MHz band will be described below.
First resonance frequency f1
<Free space state>
Resonance frequency: 859.3 MHz (VSWR = 2.50)
<Human body wearing state>
Resonance frequency: 800.5 MHz (VSWR = 1.02)
Second resonance frequency f2
<Free space state>
Resonance frequency: 1829.9 MHz (VSWR = 1.08)
<Human body wearing state>
Resonance frequency: 1710.5 MHz (VSWR = 1.07)

Next, FIG. 6 shows the measurement results of the radiation patterns at the first resonance frequency f1 and the second resonance frequency f2 for the antenna device of the above example.
Note that the extending direction of the antenna element AT (the extending direction of the second extending portion E2) is the Y direction, and the third extending portion E3 extends from the second extending portion E2 toward the fourth extending portion E4. The direction was the X direction, and the direction perpendicular to the surface of the substrate body 2 was the Z direction. At this time, vertical polarization, horizontal polarization, and power gain with respect to the YZ plane and ZX plane were measured. Moreover, this radiation pattern measurement was performed in the free space state.

  Note that the average power gain of the first resonance frequency f1 in the YZ plane was −3.0 dBi, and the average power gain of the second resonance frequency f2 was −7.6 dBi. Further, the average power gain of the first resonance frequency f1 in the ZX plane was −4.5 dBi, and the average power gain of the second resonance frequency f2 was −2.2 dBi.

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 main board is provided separately from the board main body, but an antenna device in which all the elements and the ground pattern are provided on one main board may be used.
In the above embodiment, the antenna element is provided only on the first element. However, the antenna element may be provided on the second element or the fourth element to shorten each element, thereby reducing the size of the entire apparatus. I do not care.

  DESCRIPTION OF SYMBOLS 1 ... Antenna apparatus, 2 ... Board | substrate main body, 2B ... Main board, 3 ... 1st element, 4 ... 2nd element, 5 ... 3rd element, 6 ... 4th element, AT ... Antenna element, E1 ... 1st extension Part, E1a ... wide part, E2 ... second extension part, E3 ... third extension part, E4 ... fourth extension part, E5 ... fifth extension part, GND ... ground pattern, G2 ... main ground part, K ... opening, P1a, P1b ... first passive element, P2a, P2b ... second passive element, P3 ... third passive element, P4 ... fourth passive element, FP ... feed point

Claims (5)

An insulating substrate body;
A ground pattern patterned with a metal foil on the surface of the substrate body, a first element and a second element,
A direction along the ground pattern in which the first element is provided with a feeding point on the base end side close to the ground pattern, and the first passive element and the antenna element of the dielectric antenna are connected in this order in the middle. Extending to
The second element has a base end connected to the ground pattern and a second passive element connected midway, and extends along the first element between the ground pattern and the first element. ,
The first element extends along the ground pattern from a base end to the first passive element; and
A second extending portion that extends in the extending direction of the first extending portion by arranging the antenna element halfway from the first passive element;
A third extension extending from the tip of the second extension toward the second element,
The tip of the third extension extends between the second extension and the second element, extends along the second extension, and the tip is connected to the first extension. An antenna device comprising: a fourth extending portion. The antenna device according to claim 1,
Comprising a third element patterned with a metal foil on the surface of the substrate body;
The first element has a fifth extending portion that connects the middle of the first extending portion and the ground pattern,
The third element has one end connected to the distal end side of the first extending portion and the other end connected in the middle of the second element,
The antenna, wherein the first extension part, the fifth extension part, the ground pattern, the second element, and the third element are annularly connected to form an opening inside. apparatus. 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 antenna device, wherein the fourth element is connected to the base end side of the first element and extends along the first extending portion on the side opposite to the ground pattern. In the antenna device according to any one of claims 1 to 3,
The antenna device, wherein the second extension part and the fourth extension part are longer than the third extension part. In the antenna device according to any one of claims 1 to 4,
An antenna device comprising: a main substrate having a main ground portion formed by patterning a metal foil on a surface of a main ground portion electrically connected to the ground pattern.