KR101961981B1 - Antenna device - Google Patents

Abstract

Provided is an antenna device capable of flexibly adjusting each resonance frequency which is double-resonated. (GND), a first element (3), and a second element (4) formed on a surface of a substrate main body, wherein the first element has a feed point (FP) formed on its base end side The first passive elements P1a and P1b and the antenna element AT are connected and extended together and the second element extends along the first element with the base end connected to the ground pattern, A first extension E1 extending from the base end to the first passive element along the ground pattern and a second extension E1 extending from the first passive element in the extending direction of the first extension, A third extension E3 extending from the distal end of the second extension and extending from the distal end of the third extension to a fourth extension E4 connected to the first extension, ).

Description

ANTENNA DEVICE,

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

2. Description of the Related Art Conventionally, in a communication device, an antenna device using a control voltage source, an antenna, a switch having a radiation electrode and a dielectric block, and a control voltage source has been proposed.

For example, in the prior art using a dielectric block, a composite antenna has been proposed in which a radiation electrode is formed of a resin molding and a dielectric block is integrated with an adhesive to obtain high efficiency.

According to the prior art using a switch and a control voltage source, in Patent Document 2, the first radiation electrode, the second radiation electrode, and the intermediate portion between the first radiation electrode and the base end portion of the second radiation electrode are interposed And a switch for electrically connecting or disconnecting the second radiation electrode with the first radiation electrode.

Japanese Laid-Open Patent Publication No. 2010-81000 Japanese Patent Application Laid-Open No. 2010-166287

However, the above-described conventional techniques also have the following problems.

That is, in the technique using the dielectric block as described in Patent Document 1, a dielectric block for exciting the radiation electrode is used, and it is necessary to design a dielectric block, a radiation electrode pattern, and the like for each device. There is a problem that the deterioration or the instability factor increases. Further, since the radiation electrode is formed on the surface of the resin molded article, it is necessary to design the radiation electrode pattern on the resin molded article, and the antenna design and the mold design are required depending on the communication apparatus to be mounted and the use thereof, Bringing about an increase. Further, since the dielectric block and the resin molded body are integrated with an adhesive, there is a problem that the antenna performance deteriorates or the instability factor increases depending on the bonding condition (the thickness of the adhesive, the bonding area, etc.) in addition to the Q value of the adhesive.

In the case of an antenna device using a switch or 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 in order to switch the resonance frequency with a switch. There is no freedom of design and there is a problem that it is difficult to easily adjust the antenna.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide an antenna capable of flexibly adjusting each resonance frequency and capable of ensuring inexpensive and easy antenna performance for each use and device, And it is an object of the present invention to provide a possible antenna device.

The present invention adopts the following constitution to solve the above problems. That is, an antenna device according to a first aspect of the present invention includes an insulating substrate body, a ground pattern formed on the surface of the substrate body by metal foils, a first element and a second element, Wherein a feed point is formed on the proximal end side close to the 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 and the second element is connected to the ground pattern Wherein a second passive element is connected midway to the base end and extends along the first element between the ground pattern and the first element and the first element extends from the base end to the first passive element, A first extension extending from the first passive element to the antenna, A third extending portion extending from the tip end of the second extending portion toward the second element side, and a second extending portion extending from the tip of the third extending portion to the second extending portion, And a fourth extension part extending between the second extension part and the second element and extending along the second extension part and having a tip connected to the first extension part.

In this antenna device, the first element includes a second extending portion extending from the first passive element in the extending direction of the first extending portion, and a second extending portion extending from the leading end of the second extending portion toward the second element side And a fourth extension portion extending from the tip of the third extension portion to the second extension portion and extending from the tip end of the third extension portion to the first extension portion, It is possible to constitute an opening end portion of the first element with an installation pattern capable of effectively generating the floating capacity inside and outside by the first to fourth extension portions to be connected. In other words, the antenna element can be prevented from being deteriorated by suppressing the influence of the surrounding human body and surrounding components, compared with a case where the antenna element having a high impedance becomes an open end by making the antenna element an open end.

Specifically, the stray capacitance between the fourth extended portion and the second element, the stray capacitance between the fourth extended portion and the ground pattern, and the stray capacitance between the inside (between the second extended portion and the fourth extended portion) A stray capacitance between the antenna element and the ground pattern can be generated so that at least a resonance frequency obtained mainly by the first element and a highly adjustable degree of freedom at each resonance frequency obtained by mainly taking the second element can be obtained And the reduction of the antenna performance and the influence of the human body and peripheral components can be achieved.

Therefore, it is possible to double-resonate the composite stray capacitance by effectively utilizing the internal and external stray capacitances of the loading pattern having the antenna element of the loading element which does not self-resonance to the desired resonance frequency, and it is possible to reduce the influence of the human body and peripheral components .

Further, by selecting the antenna element and the passive element, the respective resonance frequencies can be flexibly adjusted, and an antenna device capable of double-resonance according to the design conditions can be obtained. As described above, since the resonance frequency can be flexibly adjusted in the antenna configuration, the resonance frequency can be replaced, and the adjustment point of the passive element or the like can be changed depending on the application and the device.

In addition, it is possible to design in the plane of the substrate main body, so that it can be made thinner than in the case of using a conventional dielectric block or a resin molding, and at the same time, miniaturization and high performance can be achieved by selecting an antenna element which is a dielectric antenna. In addition, the cost due to the mold, the design change, and the like is not required, and low cost can be realized.

The antenna device according to the second invention is the antenna device according to the first invention, wherein the antenna element has a third element formed on the surface of the substrate body in the form of a metal foil, and the first element is connected to the ground pattern Wherein the third element has one end connected to the distal end side of the first extending portion and the other end connected to the middle of the second element, and the third extending portion is connected to the first extending portion and the fifth extending portion, And the ground pattern, the second element, and the third element are connected in an annular shape to form an opening in the inside.

That is, in this antenna device, since 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 inward, it is possible to generate a stray capacitance in the opening Further, it is possible to perform additional double resonance with another resonance frequency, and the influence of the human body and peripheral components can be reduced. It is also possible to reduce the influence of the human body and peripheral components on the two resonance frequencies of the first element and the second element by the stray capacitance generated in the opening.

The antenna device according to the third invention is the antenna device according to the first or second invention, wherein the antenna element has a fourth element formed on the surface of the substrate body in the form of a metal foil, and 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.

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 stray capacitance between the fourth element and the first element can be effectively It becomes possible to perform double resonance with different resonance frequencies.

The antenna device according to the fourth invention is characterized in that, in any one of the first to third inventions, the second extending portion and the fourth extending portion are longer than the third extending portion.

That is, in this antenna device, since the second extending portion and the fourth extending portion are longer than the third extending portion, a composite stray capacitance generated inside and outside of the girder pattern can be more effectively obtained, Can be reduced.

The antenna device according to a fifth aspect of the invention is the antenna device according to any one of the first to fourth inventions, wherein the substrate main body includes a main substrate on which a main ground portion electrically connected to the ground pattern is formed on the surface of the main substrate in the form of a metal foil .

That is, in this antenna device, since the main ground portion electrically connected to the ground pattern is provided with the main board patterned on the surface by the metal foil, the high frequency circuit or the like can be formed on the main ground portion side of the main board, It can be downsized. Further, it is also possible to provide the substrate main body on the main board or the like, and the degree of freedom of installation in the casing of the apparatus is improved. Further, in order to flexibly cope with the arrangement condition of the casing to be mounted, a flexible substrate or the like can be employed as the substrate main body separately from the main substrate. It is also possible to insert a spacer made of a high dielectric constant material or a rubber material between the substrate main body and the main substrate, so that the miniaturization effect and the shock absorption effect of the conductor pattern (each element) can be obtained.

According to the present invention, the following effects are exhibited.

According to the antenna device of the present invention, the first to fourth extension portions connected in an annular shape can constitute an open end portion of the first element with an embedding pattern capable of effectively generating the stray capacitance inside and outside, It is possible to reduce the influence of the human body and peripheral components.

Further, by selecting the antenna element and the first and second passive elements, the respective resonance frequencies can be flexibly adjusted, thereby making it possible to perform double-resonance according to the design conditions, and to achieve miniaturization and high performance.

Therefore, the antenna device of the present invention can easily perform double-resonance corresponding to various uses and devices, and can save space.

1 is a plan view showing a positional relationship of each element in an embodiment of the antenna device according to the present invention.
2 is a wiring diagram showing the stray capacitance generated in the antenna device in the present embodiment.
Fig. 3 is a perspective view (a), a plan view (b), a front view (c), and a bottom view (d) of the antenna element in this embodiment.
4 is a schematic cross-sectional view showing the antenna device in the present embodiment.
Fig. 5 is a graph showing the VSWR characteristics (voltage standing wave ratio) when the four-resonance state in the free space state and the human body mounting state in the present embodiment.
Fig. 6 is a graph showing the radiation pattern of the antenna device in this embodiment. Fig.

Hereinafter, an embodiment of an antenna device according to the present invention will be described with reference to Figs. 1 to 6. Fig.

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

The antenna device 1 further includes a main board 2B having a main ground portion G2 electrically connected to the ground pattern GND by a connection wiring 11 on a surface thereof with a metal foil such as a copper foil .

4, the substrate main body 2 is provided above the main substrate 2B, and an insulating spacer (not shown) formed of a general resin such as ABS or the like is formed between the substrate main body 2 and the main substrate 2B, (S) is inserted. The main ground portion G2 is also formed directly below the substrate main body 2.

The first element 3 has a feed point FP formed on the proximal end side close to the ground pattern GND and a pair of first passive elements P1a and P1b and an antenna element AT of the dielectric antenna Are connected in this order and extend in the direction along the ground pattern GND. Here, the direction along the ground pattern GND is a direction along the side edge of the ground pattern GND opposed to the extending direction of the ground pattern GND in the present embodiment. In the case where the antenna device is integrally formed on the main board and the ground pattern GND is shared with the main ground portion G2 formed in a larger area than the antenna occupied area, the direction along the ground pattern GND is Is a direction along the short side of the main ground portion G2 which becomes the opposing ground pattern GND.

The second element 4 is connected at its base end to the front end side of the ground pattern GND and at the same time two second passive elements P2a and P2b are connected to connect the ground pattern GND and the first element 3 extending along the first element 3.

The first element 3 includes a first extension E1 extending from the base end to the first passive element P1a along the ground pattern GND and a second extension E1 extending from the first passive element P1a to the first passive element P1a, A second extending portion E2 extending in the extending direction of the first extending portion E1 and a second extending portion E2 extending from the front end of the second extending portion E2, And a second extending portion E2 extending from the tip of the third extending portion E3 and extending between the second extending portion E2 and the second element 4, And a fourth extension E4 extending along and connected at its tip to the first extension E1. That is, the first to third extended portions E1 to E4, which are connected in an annular shape, are formed in the open end portion of the first element 3 so as to effectively generate the stray capacitance inside and outside.

The third extending portion E3 extends in the 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 E4 are set longer than the third extended portion E3.

The first element 3 has a fifth extending portion E5 for connecting the middle of the first extending portion E1 to the ground pattern GND. The fifth extending portion E5 extends from the middle of the first extending portion E1 toward the ground pattern GND and is connected in the middle of the ground pattern GND through the third passive element P3.

The third element 5 has one end connected to the tip end side of the first extending portion E1 and the other end connected to the middle of the second element 4. In other words, in the third element 5, the other end is connected between the second passive element P2a and the second passive element P2b. Further, a passive element may be connected to the portion of the third element 5.

Accordingly, the first extension E1, the fifth extension E5, the ground pattern GND, the second element 4, and the third element 5 are connected in an annular fashion to form an opening K on the inner side .

The fourth element 6 is connected to the base end side of the first element 3 through the fourth passive element P4 and extends along the first extended portion E1 on the side opposite to the ground pattern GND .

The distal end side of the first elongated portion E1 is a wider portion E1a formed to be wider than the proximal end side and the distal end of the fourth element 6 is disposed opposite to the wider portion E1a. The wide end E1a is connected to the tip of the fourth extending portion E4 and is connected to the third element 5. [

The substrate main body 2 and the main substrate 2 are general printed boards, 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 high-frequency circuit (roughly shown) formed in the main ground G2 of the main substrate 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, a conductor pattern 22 such as Ag is formed on the surface of a dielectric 21 such as ceramics Chip antenna. In this antenna element AT, it is possible to select an element whose length, width, and conductor pattern 22 are different from each other depending on 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 are spaced apart from each other so as to generate a stray capacitance between the stray capacitance and a stray capacitance between the ground pattern GND .

2, the stray capacitance Ca between the fourth extended portion E4 and the second element 4 and the stray capacitance between the fourth extended portion E4 and the ground pattern GND The stray capacitance Cb between the antenna element AT and the ground pattern GND and the stray capacitance of the antenna element AT between the second extended portion E2 and the fourth extended portion E4, The stray capacitance Cd between the fourth element 6 and the first element 3 (wide portion E1a) and the stray capacitance Ce between the fourth element 6 and the first element 3 The stray capacitance Cf between the fourth element 6 and the ground pattern GND and the stray capacitance Cg between the fourth element 6 and the ground pattern GND, The stray capacitance Ci between the first extended portion E1 and the ground pattern GND and the stray capacitance Cj between the second element 4 and the ground pattern GND may occur.

As the first passive elements P1a and P1b and the second passive elements P2a and P2b to the fourth passive elements P4, for example, a jumper wire, an inductor, a capacitor or a resistor is employed.

Next, the respective resonance frequencies in the antenna apparatus of the present embodiment will be described with reference to Figs. 1 and 5. Fig.

5, the antenna device 1 of the present embodiment has the first resonance frequency f1, the second resonance frequency f2, the third resonance frequency f3, and the fourth resonance frequency f4 4 times.

The first resonance frequency f1 is a resonance frequency lower than the resonance frequency of the first element 3 and the first resonance frequency f1 is a resonance frequency of the first element 3 ) And the stray capacitance. The second resonance frequency f2 is an intermediate frequency band among the four resonance frequencies and the second resonance frequency f2 is the resonance frequency of the second element 4 and the first passive elements P1a and P1b and the first extension E1, Lt; / RTI > The third resonance frequency f3 is an intermediate frequency band that is different from the second resonance frequency f2 among the four resonance frequencies and is an opening portion K and the second passive elements P2a and P2b and the ground pattern GND ) And the stray capacitance. The fourth resonance frequency f4 is a resonance frequency higher than the resonance frequency of the first resonance frequency f2 and the fourth resonance frequency f4 is higher than the resonance frequency of the second element 4 and the second passive elements P2a and P2b, Lt; / RTI >

The third passive element P3 is used for each resonance frequency to control the flow of the high-frequency current flowing toward the ground pattern GND, thereby performing the final impedance adjustment.

Hereinafter, these resonance frequencies will be described in more detail.

&Quot; With respect to the first resonance frequency f1 "

The frequency of the first resonance frequency f1 is determined by the resonance frequency of the first resonance frequency f1 and the frequency of the first resonance frequency f1 Cb, Cc, Cd, Ce, Cf, and Cg in the first extension E1 and the stray capacitances Ca, Cb, Cc, Cd, and Ce.

The impedance adjustment of the first resonance frequency f1 can be performed by setting the stray capacitances of the stray capacitances Ca, Cb, Cc, Cd, Ce, Cf, and Cg.

The final frequency adjustment can be performed flexibly by selection of the first passive elements P1a and P1b.

The final impedance adjustment can be performed flexibly by the selection of the third passive element P3.

As described above, the resonance frequency and the 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 mainly adjusted in the portion indicated by the broken line A1 in Fig.

Quot; 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 and Ch.

The impedance adjustment of the second resonance frequency f2 can be performed by setting the stray capacitances of the stray capacitances Ce, Cf, and Ch.

The final frequency adjustment can be performed flexibly by the selection of the fourth passive element P4.

The final impedance adjustment can be performed flexibly by the selection of the third passive element P3.

Thus, the resonance frequency and the impedance can be flexibly adjusted by the "fourth element", the "length of each element", the "passive element" and the "stray capacitance". That is, the second resonance frequency f2 is mainly adjusted at the part of the one-dot chain line A2 in Fig.

Quot; about the third resonance frequency f3 "

The frequency of the third resonance frequency f3 can be set and adjusted by the first extension E1 and the stray capacitances Cf, Cg, Ci.

The impedance adjustment of the third resonance frequency f3 can be performed by setting the stray capacitances of the stray capacitances Cf, Cg, and Ci.

In addition, the final frequency adjustment can be performed flexibly by the selection of the second passive element P2a.

The final impedance adjustment can be performed flexibly by the selection of the third passive element P3.

As described above, the resonance frequency and impedance can be flexibly adjusted by "each element length", "passive element" and "stray capacitance". That is, the third resonance frequency f3 is mainly adjusted at the portion indicated by the two-dot chain line A3 in Fig.

Quot; about the fourth resonance frequency f4 "

The frequency of the fourth resonance frequency f4 can be set and adjusted by the second element 4 and the first extension E1 and the stray capacitances Ca, Cb, Cf, Cg and Cj.

The impedance adjustment of the fourth resonance frequency f4 can be performed by setting the stray capacitances of the stray capacitances Ca, Cb, Cf, Cg and Cj.

In addition, the final frequency adjustment can be flexibly performed by selecting the second passive elements P2a and P2b.

The final impedance adjustment can be performed flexibly by the selection of the third passive element P3.

Thus, the resonance frequency and the impedance can be flexibly adjusted by the "second element 4", the "length of each element", the "passive element" and the "stray capacitance". That is, the fourth resonance frequency f4 is mainly adjusted in the portion of the dotted line A4 in Fig.

Next, the portion of the embossed pattern will be described.

The attachment pattern is formed on the front side of the first extending portion E1 and is formed in a loop by the first extending portion E1 to the fourth extending portion E4, It is designed in such a way that a complex capacity is placed on the part.

The fourth extension E4 is disposed so as to generate a stray capacitance Ca between the second element 4 and the fourth extension E4 and the fourth resonance frequency f4 generated by the second element 4, It is preferable to adopt a configuration in which the above-described structure is mounted.

In addition, in order to make both the antenna performance and the influence of the human body and peripheral components reduced, the larger the area of the embedding pattern portion, the better. In addition, if the area is the same, the lengths of the second extended portion E2 and the fourth extended portion E4 are preferably set longer than the length of the third extended portion E3.

Next, the opening K will be described.

The opening K includes a first extension E1, a fifth extension E5, a third passive element P3, a ground pattern GND, a second element 4, a second passive element P2a, And is surrounded by the third element 5. The influence of the human body and peripheral components can be reduced by the stray capacitance Cg generated in the opening K. This opening K is also effective for the first resonance frequency f1 by the portion of the embedding pattern and the fourth resonance frequency f4 by the second element 4, The influence of peripheral components can be reduced.

In order to enhance the performance of the antenna, it is preferable that the opening area of the opening K is wide. For the third passive element P3, it is preferable that the impedance is high with respect to a desired resonance frequency.

As described above, in the antenna device 1 of the present embodiment, the first element 3 is disposed on the way from the first passive element P1a to the extending direction of the first extended portion E1 A third extending portion E3 extending from the front end of the second extending portion E2 toward the second element 4 and a third extending portion E2 extending from the front end of the second extending portion E2 toward the second element 4, And a fourth extension E4 extending between the second extended portion E2 and the second element 4 from the leading end along the second extended portion E2 and having a tip connected to the first extended portion E1 The first to third extended portions E1 to E4 that are connected in an annular shape can constitute an open end portion of the first element 3 with an embedding pattern capable of effectively generating the stray capacitance inside and outside .

That is, compared to the case where the antenna element (first element 3) is an open end portion, the antenna element AT having a high impedance becomes an open end, the influence of the surrounding human body and peripheral components And deterioration of the antenna performance can be prevented.

In this manner, the complex stray capacitance of the inner and outer stray patterns having the antenna element (AT) of the loading element which does not self resonate at a desired resonance frequency can be effectively used to double-resonate, thereby reducing the influence of the human body and peripheral components .

Further, by selecting the antenna element (AT) and the passive element, the respective resonance frequencies can be flexibly adjusted, and an antenna device capable of double-resonance according to the design conditions can be obtained. As described above, since the resonance frequency can be flexibly adjusted in the antenna configuration, the resonance frequency can be changed, and the adjustment point by the passive element or the like can be changed depending on the application and the device.

In addition, it is possible to design in the plane of the substrate main body 2, so that it can be made thinner than in the case of using a conventional dielectric block or a resin molding, and at the same time, miniaturization and high performance can be achieved by selecting an antenna element which is a dielectric antenna . In addition, the cost due to the mold, the design change, and the like is not required, and low cost can be realized.

The first extending portion E1 and the fifth extending portion E5 and the ground pattern GND and the second element 4 and the third element 5 are connected in an annular shape to form an opening K It is possible to generate the stray capacitance Cg in the opening K and to further reduce the resonance frequency f3 by the other resonance frequency f3 and reduce the influence of the human body and peripheral components. It is also possible to reduce the influence of the human body and peripheral components on the first and fourth resonance frequencies f1 and f4 by the stray capacitance Cg generated in the opening K. [

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 The resonance frequency f2 that is different from the first and fourth resonance frequencies f1 and f4 makes it possible to perform additional double resonance by effectively utilizing the stray capacitance between the first element 3 and the first element 3. [

Since the second extended portion E2 and the fourth extended portion E4 are longer than the third extended portion E3, a composite stray capacitance generated inside and outside of the girder pattern can be obtained more effectively, The influence of the component can be further reduced.

Since the main ground portion G2 electrically connected to the ground pattern GND is provided on the surface of the main board 2B in the form of a metal foil patterned on the surface of the main ground portion G2, Frequency circuit or the like can be formed, and the substrate main body 2 can be downsized. In addition, it is also possible to provide the substrate main body 2 on the main board 2B and the like, thereby improving the degree of freedom in installation of the apparatus in the casing. In addition, a flexible substrate or the like can be employed for the substrate main body 2 separately from the main substrate 2B in order to flexibly cope with the arrangement condition of the casing to be mounted. It is also possible to insert a spacer made of a high dielectric constant material or a rubber material between the substrate main body 2 and the main substrate 2B to obtain a miniaturization effect and a shock absorption effect of the conductor pattern (each element).

Example

Next, the results of measurement of the VSWR characteristics (voltage standing wave ratio) and the measurement results of the radiation patterns at the respective resonance frequencies are shown in Figs. 5 and 6 .

First, the VSWR characteristic (the voltage standing wave ratio) is compared with the case where the free space is set without the human body and peripheral parts around, and the case where the human body is virtually attached to the PET bottle filled with physiological saline solution having the same salt concentration as the human body. The results are shown in Fig.

5, an inductor L = 1.5 nH is used as the first passive element P1a and an inductor L = 20 nH is used as the first passive element P1b. A jumper wire was used as the second passive element P2a and an inductor L = 10 nH was used as the second passive element P2b. 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 the measurement results, even when the first to fourth resonance frequencies f1 to f4 obtained in the free space state are in the human body mounted state, the variation of the resonance frequency is small and the variation is suppressed .

Typically, the first resonance frequency f1 in the 900 MHz band and the second resonance frequency f2 in the 1800 MHz band are shown below.

The first resonance frequency (f1)

<Free space condition>

Resonant frequency: 859.3 MHz (VSWR = 2.50)

<Human Body Mounted>

Resonant frequency: 800.5 MHz (VSWR = 1.02)

The second resonance frequency (f2)

<Free space condition>

Resonant frequency: 1829.9 MHz (VSWR = 1.08)

<Human Body Mounted>

Resonant frequency: 1710.5 MHz (VSWR = 1.07)

Next, the antenna device of the above embodiment was measured for radiation patterns at the first resonance frequency f1 and the second resonance frequency f2, and the results are shown in Fig.

A third extending portion (second extending portion E2) extending from the second extending portion E2 to the fourth extending portion E4 is defined as a Y-direction extending direction of the antenna element AT E3 are defined as the X direction, and the direction perpendicular to the surface of the substrate main body 2 is defined as the Z direction. The vertical polarization, the horizontal polarization, and the power gain were measured for the YZ plane and the ZX plane at this time. This radiation pattern measurement was performed in the free space state.

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. 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.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the main board is formed separately from the board main body, but an antenna device in which all the elements and the ground pattern are formed on one main board may be used.

In the above-described embodiment, the antenna element is formed only in the first element. However, the antenna element may be formed in the second element or the fourth element to shorten each element, thereby miniaturizing the entire device.

1: Antenna device
2: substrate body
2B: main substrate
3: first element
4: second element
5: third element
6: fourth element
AT: Antenna element
E1: first extension
E1a: wide portion
E2:
E3: third extension part
E4: fourth extension part
E5: Fifth extension
GND: Ground pattern
G2: Main ground section
K: opening
P1a, P1b: the first passive element
P2a, P2b: second passive element
P3: Third passive element
P4: fourth passive element
FP: feed point

Claims (5)

An insulating substrate main body,
A ground pattern formed on the surface of the substrate body in a pattern of metal foil, a first element and a second element,
Wherein the first element has a feeding point formed on a proximal end side close to the ground pattern and an antenna element of a first passive element and a dielectric antenna are connected in this order and extend in a direction along the ground pattern,
The second element is connected at its base end to the ground pattern and a second passive element is connected midway to extend along the first element between the ground pattern and the first element,
Wherein the first element comprises a first extension extending from the base end to the first passive element along the ground pattern,
A second extension portion extending from the first passive element in the extending direction of the first extended portion,
A third extending portion extending from the tip of the second extending portion toward the second element side,
And a fourth extension portion 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 and having a tip connected to the first extension portion. The method according to claim 1,
And a third element patterned on the surface of the substrate body by a metal foil,
Wherein the first element has a fifth extending portion connecting the middle of the first extending portion and the ground pattern,
Wherein the third element has one end connected to the distal end side of the first extended portion and the other end connected to the middle of the second element,
Wherein 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 in the inside. The method according to claim 1,
And a fourth element patterned on the surface of the substrate body as a metal foil,
And 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 method according to claim 1,
Wherein the second extension portion and the fourth extension portion are longer than the third extension portion. The method according to claim 1,
And a main ground portion electrically connected to the ground pattern is formed on the surface of the main board in the form of a metal foil.

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