JP4562556B2 - Multi-frequency antenna switch and multi-frequency antenna using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch for a multifrequency antenna and the multifrequency antenna employing the switch capable of reducing the effect of the switch by taking a wide space between the microstrip antenna (MSA) and the switch by using a pressure of fluid for a drive source of the switch. <P>SOLUTION: The microstrip antenna (MSA) for varying a transmission/eception frequency by electrically connecting/disconnecting (switching) a feeding antenna element 1 including a feeding point 2 to/from a parasitic antenna element 3 not including the feeding point. Further, the pressure of the fluid is used for switching operations between the antenna elements 1, 3. The switch 4 is located under an MSA radiation face. A conductive part of the switch 4 in contact with the MSA is made of a flat plate and the contact between them is switched by vertically moving the flat plate. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a multi-frequency antenna switch and a multi-frequency antenna, and more particularly to a multi-frequency antenna switch that can be used in a multi-frequency communication system and the like and a multi-frequency antenna using the same.

Recently, with the development of communication technology, there has been a demand for transmitting and receiving multiple frequencies with one antenna. Basically, since the frequency is determined by the influence of the antenna size and material characteristics, usually a plurality of antennas are required.
As shown in FIG. 10, a “multi-frequency resonant laminated batch antenna” described in Japanese Patent Laid-Open No. 2003-283240 (see Patent Document 1) is a laminated antenna corresponding to three frequencies, and the three antennas are laminated. Therefore, the size is reduced, and it is configured as if it is one antenna, and is downsized.

  Moreover, as shown in FIG. 11, the “multi-frequency planar antenna” described in Japanese Patent Laid-Open No. 2003-152431 (see Patent Document 2) has antenna size frames corresponding to each frequency provided in a concentric manner in advance. The frame is switched according to the frequency.

  However, since the proposal described in Japanese Patent Laid-Open No. 2003-283240 is laminated, the manufacturing process may be complicated. In addition, since the proposal described in Japanese Patent Laid-Open No. 2003-152431 requires a plurality of feeding points, it is difficult to manufacture a plurality of coaxial lines in a narrow place when considering coaxial feeding. Both can support multiple frequencies, but both can be used only at a predetermined frequency because the antenna pattern is constant.

Accordingly, the present inventor and the present applicant have proposed a multi-frequency MSA that is relatively easy to manufacture and that allows a plurality of frequencies to be selected without preparing a plurality of antennas (Japanese Patent Application 2005- [019700] "Multi-frequency compatible patch antenna and multi-frequency compatible patch antenna system" in the specification and drawings (see Patent Document 3) In this proposal, as shown in Fig . 9, on a multi-frequency antenna (hereinafter referred to as MSA) The switch 4 is used to electrically connect the antenna elements 1 and 3 so that the frequency can be varied by changing the excitation length.This method is easy to downsize and is a very effective means. However, since the switch 4 is on the MSA, that is, in the radiating part, the effect is somewhat affected.When the MSA and the switch are OFF, the space may not be sufficient. Come out.

Japanese Patent Laid-Open No. 2003-283240 JP 2003-152431 A Japanese Patent Application No. 2005-019700 Specification and Drawing

As in Patent Document 1, the laminated structure has a problem that the manufacturing process becomes complicated. Further, as in Patent Document 2, a plurality of feeding points that must be prepared have a problem in that it is difficult to manufacture a plurality of coaxial lines in a narrow place when considering coaxial feeding. In addition, Patent Documents 1 and 2 have a problem that they can be used only at a predetermined frequency because the antenna pattern is constant.
Furthermore, as in Patent Document 3, a switch provided on the MSA is used to electrically connect the antenna elements and change the excitation length. And when MSA and the switch were OFF, there was a problem that the space could not be taken

(the purpose)
Therefore, an object of the present invention is to arrange a switch under the MSA and use the fluid pressure as a drive source of the switch, so that a sufficient space between the MSA and the switch can be taken and the influence of the switch can be reduced. To provide a switch for a frequency antenna and a multi-frequency antenna using the same.

  The present invention relates to a microstrip antenna (hereinafter referred to as MSA) that changes a transmission / reception frequency by electrically connecting or disconnecting (switching) a feeding element including a feeding point and a parasitic element not including a feeding point by a switch. Is switched using the pressure of the fluid. Accordingly, since the fluid pressure is used, a large switching stroke can be obtained. Therefore, by arranging the switch below the MSA, it is possible to eliminate the influence on radiation.

According to the present invention, the following effects can be obtained.
First, since the operation of switching between the antenna elements is performed using the pressure of the fluid, the switch structure is simplified.
Moreover , since the switch is located below the MSA radiation surface, the influence on radiation can be eliminated.
Further, for moving the switch plate with the pressure of the fluid, it is possible to increase the movement stroke of the switch plate, when MSA and switch is OFF, concern the effects of capacitive coupling-ring is eliminated.

In addition , since the conductive portion of the switch that contacts the MSA is a thin plate, and the thin plate is bent to perform switching, a large switching stroke can be taken, and there is no concern about capacitive coupling.
In addition , since a stopper is provided between the MSA and the conductive part of the switch, the switch will not be accidentally turned on even if the attitude of the MSA changes.
In addition , the conductive part of the switch in contact with the MSA is a conductive elastic body (rubber-like), which is expanded and switched, so the switching stroke can be increased, and there is no need to worry about capacitive coupling. The switch will not turn on accidentally even if the posture changes.

The fluid than can be used gases such as air, cost also hardly applied.
Moreover , since liquids, such as water, can be used for a fluid, there is almost no cost.
In addition , since a micropump is used as a means for generating the operating pressure of the fluid, the MSA does not increase.
Moreover , since the micropump is made of MEMS, it can be made even smaller.

Further , since a heating method using a heater is used as a means for generating an operating pressure of the fluid, it is possible to reduce the size and to improve reliability because there is no movable part.
In addition , since the means for generating the operating pressure is installed in each switch unit, the need for a flow path, a micro valve, etc. is eliminated, and the controllability is improved.
In addition, since the above-described switch is mounted, a small and high performance MSA can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The drawings used hereinafter are exaggerated or partly omitted for easy understanding. For ease of explanation, the explanation is made with a few patches.
FIG. 9 is a configuration diagram of a multi-frequency compatible MSA previously filed by the present inventor and the present applicant.
FIG. 9A is a plan view, and FIG. 9B is a cross-sectional view taken along the line AA ′ of FIG. 9A. In the plan view of FIG. 9A, the dielectric substrate 7 and the ground plane 10 are omitted.

  The basic feeding element 1 is arranged on the surface of a dielectric substrate 7 provided with a ground plane 10 on the opposite side. The feeding element 1 is provided with a feeding point 2 from which power is received. This feed element 1 works as an MSA corresponding to the length in the excitation direction. A parasitic element 3 is arranged beside the feeding element 1. The parasitic element 3 is not fed and is in an electrically floating state. Between the feed element 1 and the parasitic element 3, a switch plate 4 for electrically connecting both elements is disposed. The switch plate 4 has a drive electrode 5, and an attractive force is generated by the electrostatic force between the upper electrode 5a and the lower electrode 5b. By controlling the electrostatic force, the switch plate 4 moves in the direction of the arrow in FIG. It can be done. An insulator is provided so that the electrodes are not in direct contact with each other, and an insulator is also provided between the switch plates 4 that electrically connect the elements directly, thereby being insulated.

When the switch plate 4 is lowered and the feed element 1 and the parasitic element 3 are electrically connected via the switch plate 4, the frequency of the MSA is the excitation direction of the feed element 1, the switch plate 4 and the parasitic element 3. The frequency corresponds to the electrical length. Note that the input impedance of the feeding point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. However, since the switch is on the MSA, that is, in the radiating part, the effect is somewhat affected. In addition, when the MSA and switch are OFF, there may be cases where there is not enough space.

Therefore, in the present invention, the switch is disposed below the MSA, and the pressure of the fluid is used as the drive source of the switch, so that sufficient space between the MSA and the switch is taken to reduce the influence of the switch.
Example 1
FIG. 1 is a plan view of a multi-frequency antenna according to Embodiment 1 of the present invention.
1A is a plan view, and FIG. 1B is a cross-sectional view taken along the line BB ′ of FIG. In the plan view, the base plate 10 is omitted.
The basic feeding element 1 is disposed on the surface of a dielectric substrate 7 provided with a ground plane 10 on the opposite side. The feeding element 1 is provided with a feeding point 2 from which power is fed.
This feed element 1 works as an MSA corresponding to the length in the excitation direction. A parasitic element 3 is arranged beside the feeding element 1. The parasitic element 3 is not fed and is in an electrically floating state.

  Between the feeding element 1 and the parasitic element 3, a switch plate 4 for electrically connecting both elements is disposed below the feeding element 1 and the parasitic element 3. The switch plate 4 can be switched by moving in the direction of the arrow in FIG. 1B by utilizing the pressure of the fluid. That is, when pressure is applied to the pressure chamber 6 through the flow path 8 provided in the fluid substrate 9, the switch plate 4 is raised and turned on, and when the pressure is lowered, the switch plate 4 is lowered and turned off. In the case of this example, since the sealing degree of the pressure chamber 6 is not so high, the fluid is preferably a gas such as air. Note that the pressure is applied by sending gas from a micro pump outside the flow path substrate, and selecting ON / OFF of each switch by a micro valve provided in the flow path substrate (see FIG. 8).

FIG. 1C shows an example in which the pressure is applied to the pressure chamber 6 so that the switch plate 4 is raised, and the feed element 1 and the parasitic element 3 are electrically connected via the switch plate 4. The frequency as the MSA at this time is a frequency corresponding to the electrical length in the excitation direction of the feed element 1, the switch plate 4, and the parasitic element 3. Note that the input impedance of the feeding point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. Also, since the switch 4 is under the MSA, that is, under the radiating part, the influence is eliminated. Further, since the switch plate 4 is moved using the pressure of the fluid, the moving stroke of the switch plate 4 can be increased, and there is no need to worry about the influence of capacitive coupling when the MSA and the switch are OFF.

(Example 2)
FIG. 2 is a cross-sectional structure diagram of a multi-frequency antenna according to Embodiment 2 of the present invention.
The structure of FIG. 2 is substantially the same as the structure of FIG. 1, and a switch plate 4 for electrically connecting both elements via the elastic thin film 11 is interposed between the feed element 1 and the parasitic element 3. The feeding element 1 and the parasitic element 3 are disposed below. The switch plate 4 can be switched by moving in the direction of the arrow in FIG. 2A by utilizing the pressure of the fluid.
That is, when pressure is applied to the pressure chamber 6 surrounded by the elastic thin film 11 through the flow path 8 provided in the fluid substrate 9, the switch plate 4 is raised and turned on, and when the pressure is lowered, the switch plate 4 is lowered and turned off. It is supposed to be. In the case of this example, since the elastic thin film 11 is provided and the pressure chamber 6 has a high sealing degree, not only a gas but also a liquid such as water can be used as the fluid.
Note that the pressure is applied by sending gas or liquid from a micro pump outside the flow path substrate, and selecting each switch ON / OFF by a micro valve provided in the flow path substrate (see FIG. 8).

In FIG. 2B, pressure is applied to the pressure chamber 6, and the elastic thin film 11 extends to raise the switch plate 4, and the feed element 1 and the parasitic element 3 are electrically connected via the switch plate 4. It is an example. The frequency as the MSA at this time is a frequency corresponding to the electrical length in the excitation direction of the feed element 1, the switch plate 4, and the parasitic element 3. Note that the input impedance of the feed point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. Also, the effect is eliminated because the switch is under the MSA, that is, under the radiating part. In addition, since the switch plate 4 is moved using the pressure of the sealed fluid, there is no pressure loss, and the movement stroke of the switch plate 4 can be increased with a stable operation, and the capacity when the MSA and the switch are OFF. No worries about coupling effects.
In addition, since the switch plate 4 is held by the elastic thin film, the switch is not accidentally turned on regardless of the installation posture of the MSA.

(Example 3)
FIG. 3 is a sectional structural view of a multi-frequency antenna according to Embodiment 3 of the present invention.
The structure of FIG. 3 is substantially the same as the structure of FIG. 1, and a thin switch plate 4 for electrically connecting both elements between the feeding element 1 and the parasitic element 3 is between the elements. Further, the feeder 12 and the parasitic element 3 are disposed below the stopper 12. The stopper 12 is provided so that the switch plate 4 is always turned off so that the switch plate 4 does not accidentally contact the element even if the MSA posture changes when the pressure is low.

  The switch plate 4 is bent in the direction of the arrow in FIG. 3A by using the pressure of the fluid, and can be switched. That is, when pressure is applied to the pressure chamber 6 through the flow path 8 provided in the fluid substrate 9, the switch plate 4 is bent and turned on, and when the pressure is lowered, the switch plate 4 is returned and turned off. . In the case of this example, since the sealing degree of the pressure chamber 6 is not so high, the fluid is preferably a gas such as air. Note that the pressure is applied by sending gas from a micro pump outside the flow path substrate, and selecting ON / OFF of each switch by a micro valve provided in the flow path substrate (see FIG. 8).

FIG. 3B shows an example in which the pressure is applied to the pressure chamber 6 so that the switch plate 4 is bent, and the feed element 1 and the parasitic element 3 are electrically connected via the switch plate 4. The frequency as the MSA at this time is a frequency corresponding to the electrical length in the excitation direction of the feed element 1, the switch plate 4, and the parasitic element 3. Note that the input impedance of the feeding point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. Also, the effect is eliminated because the switch is under the MSA, that is, under the radiating part. In addition, since the switch plate is bent using the pressure of the fluid, the switch plate can be moved in a large stroke, and there is no need to worry about the effect of capacitive coupling when the MSA and the switch are OFF. In addition, since there is a stopper between the switch plate and the element, the MSA will not be accidentally turned on no matter what position the MSA is installed in.

Example 4
FIG. 4 is a cross-sectional structure diagram of a multi-frequency antenna according to Example 4 of the present invention.
The structure of FIG. 4 is substantially the same as the structure of FIG. 1, and a thin switch plate 4 for electrically connecting both elements is provided between the power supply element 1 and the passive element 3. The stopper 12 is sandwiched between the feeder element 1 and the parasitic element 3 via the elastic thin film 11. The switch plate 4 can be switched by being bent in the direction of the arrow in FIG. 4A by utilizing the pressure of the fluid. That is, when pressure is applied to the pressure chamber 6 through the flow path 8 provided in the fluid substrate 9, the switch plate 4 is bent and turned ON, and when the pressure is reduced, the switch plate 4 is returned and turned OFF. Yes. In this example, since the elastic thin film 11 is provided and the pressure chamber 6 has a high sealing degree, not only a gas but also a liquid such as water can be used as the fluid. Note that the pressure is applied by sending gas or liquid from a micro pump outside the flow path substrate, and selecting each switch ON / OFF by a micro valve provided in the flow path substrate (see FIG. 8).

FIG. 4B shows an example in which pressure is applied to the pressure chamber 6, the elastic thin film 11 extends to bend the switch plate 4, and the feed element 1 and the parasitic element 3 are electrically connected via the switch plate 4. It is.
The frequency as the MSA at this time is a frequency corresponding to the electrical length in the excitation direction of the feed element 1, the switch plate 4, and the parasitic element 3. Note that the input impedance of the feeding point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. Also, since the switch is under the MSA, that is, under the radiating part, the effect is eliminated. In addition, since the switch plate is moved using the pressure of the sealed fluid, there is no pressure loss and the switch plate can be moved with a large stroke with stable operation. Capacitive coupling when the MSA and the switch are OFF No worries about the effects of
In addition, since there is a stopper 12 between the switch plate 4 and the element and the switch plate 4 is held by the elastic thin film 11, the MSA can be installed by mistake even if it is used in any orientation. It will never be ON.

(Example 5)
FIG. 5 is a sectional structural view of a multi-frequency antenna according to Example 5 of the present invention.
The structure of FIG. 5 is substantially the same as the structure of FIG. 1, and a conductive elastic body 13 for electrically connecting both elements is provided between the feeding element 1 and the parasitic element 3. It is disposed below the parasitic element 3. The conductive elastic body 13 can expand and contract in the direction of the arrow in FIG. 5A by using the pressure of the fluid, and can be switched. That is, when pressure is applied to the pressure portion 6a surrounded by the conductive elastic body 13 through the flow path 8 provided in the fluid substrate 9, the conductive elastic body 13 expands to be ON, and if the pressure is reduced, the pressure is reduced. The elastic elastic body 13 is shrunk and turned off. In this example, since the pressure part 6a has a high sealing degree, not only a gas but also a liquid such as water can be used as the fluid. Note that the pressure is applied by sending gas or liquid from a micro pump outside the flow path substrate, and selecting each switch ON / OFF by a micro valve provided in the flow path substrate (see FIG. 8).

In FIG. 5B, when the pressure is applied to the pressure chamber 6 a and the conductive elastic body 13 expands, the feeding element 1 and the parasitic element 3 are electrically connected via the conductive elastic body 13. It is an example.
The frequency as MSA at this time is a frequency corresponding to the electrical length of the feeding element 1, the conductive elastic body 13, and the parasitic element 3 in the excitation direction. Note that the input impedance of the feeding point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. Also, since the switch is under the MSA, that is, under the radiating part, the effect is eliminated. In addition, since the conductive elastic body is expanded and contracted using the pressure of the sealed fluid, there is no pressure loss and the movement stroke of the conductive elastic body can be increased with stable operation. When the MSA and switch are OFF No worries about the effects of capacitive coupling. In addition, since the conductive elastic body does not move even if the attitude of the MSA is tilted, the switch is not accidentally turned on regardless of the attitude.

(Example 6)
FIG. 6 is a sectional structural view of a multi-frequency antenna according to Embodiment 6 of the present invention.
The structure of FIG. 6 is substantially the same as the structure of FIG. 1, and a switch plate 4 for electrically connecting both elements is provided between the feed element 1 and the parasitic element 3. Arranged below the element 3. The switch plate 4 can be switched by moving in the direction of the arrow in FIG. 6 by utilizing the pressure of the fluid. When pressure is applied to the pressure chamber 6, the switch plate 4 is raised and turned on. When the pressure is lowered, the switch plate 4 is lowered and turned off. In the case of this example, since the sealing degree of the pressure chamber 6 is not so high, the fluid is preferably a gas such as air. Below each switch plate 4, a MEMS pump 14 installed on the MEMS pump substrate 16 is provided, and each switch plate 4 receives pressure from the MEMS pump 14. Selection of ON / OFF of each switch plate 4 is performed by the MEMS pump 14.

The frequency of the MSA when the switch is ON is a frequency corresponding to the electrical length of the feed element 1, the switch plate 4, and the parasitic element 3 in the excitation direction. Note that the input impedance of the feeding point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. Further, since the switch plate 4 is under the MSA, that is, under the radiating portion, the influence is eliminated. Further, since the switch plate is moved using the pressure of the fluid, the moving stroke of the switch plate 4 can be increased, and there is no concern about the influence of capacitive coupling when the MSA and the switch are OFF.
In addition, since the MEMS pump is disposed in each switch unit, the flow path substrate and the micro valve for selecting the flow path are not necessary, which can be simplified and the controllability is improved.

(Example 7)
FIG. 7 is a cross-sectional structure diagram of a multi-frequency antenna according to Example 7 of the present invention.
The structure of FIG. 7 is almost the same as the structure of FIG. 1, and a switch plate 4 for electrically connecting both elements through the elastic thin film 11 between the feed element 1 and the passive element 3. The feeding element 1 and the parasitic element 3 are disposed below. The switch plate 4 moves in the direction of the arrow in FIG. 7 by using the pressure of the fluid, and can be switched.
When pressure is applied to the pressure chamber 6 surrounded by the thin film of the elastic thin film 11, the switch plate 4 is raised and turned on, and when the pressure is lowered, the switch plate 4 is lowered and turned off. In the case of this example, since the elastic thin film 11 is provided and the pressure chamber 6 has a high sealing degree, not only a gas but also a liquid such as water can be used as the fluid. Under each switch plate 4, a heater 15 installed on the heater substrate 17 is provided, and each switch plate 4 receives pressure due to fluid expansion caused by heating the heater 15. Selection of ON / OFF of each switch plate 4 is performed by the heater 15.

The frequency of the MSA when the switch is ON is a frequency corresponding to the electrical length of the feed element 1, the switch plate 4, and the parasitic element 3 in the excitation direction. Note that the input impedance of the feeding point 2 is always adjusted to an optimum impedance by a matching circuit (not shown).
With this configuration, it is possible to select a plurality of frequencies without preparing a plurality of MSAs. Further, since the switch plate 4 is under the MSA, that is, under the radiating portion, the influence is eliminated. Also, since the switch plate 4 is moved using the pressure of the sealed fluid, there is no pressure loss, and the switch plate can be moved with a large stroke with a stable operation. When the MSA and the switch plate 4 are OFF, No worries about the effects of capacitive coupling. In addition, since the switch plate 4 is held by the elastic thin film, the switch is not accidentally turned on regardless of the installation posture of the MSA.
In addition, since the heater 15 is disposed in each switch unit, the flow path substrate and the micro valve for selecting the flow path are not required, which can be simplified and controllability is improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and there may be a plurality of feeding points instead of one. In the embodiment, the number of power feeding elements is one. However, there is no problem if there are a plurality of power feeding elements. Furthermore, the parasitic element may be dropped to GND or floated as necessary.
Although the present invention has been described as multi-frequency compatible, there is no problem if it is used not only for multi-frequency compatible but also for other functions. Furthermore, it goes without saying that various shapes and structures described in the embodiments may be combined.
As described above, by using the present invention, it is possible to realize a multi-frequency compatible MSA or the like that can be manufactured relatively easily and can select a plurality of frequencies without preparing a plurality of antennas. . In addition, since the switch is under the MSA, that is, under the radiating part, the effect is eliminated, and the switch plate is moved using the pressure of the fluid. And there is no need to worry about the effects of capacitive coupling when the switch is OFF.

1 is a structural diagram of a multi-frequency antenna according to Embodiment 1 of the present invention. It is a cross-section figure of the multifrequency antenna which concerns on Example 2 of this invention. It is a cross-section figure of the multifrequency antenna which concerns on Example 3 of this invention. It is a cross-section figure of the multifrequency antenna which concerns on Example 4 of this invention. It is a cross-section figure of the multifrequency antenna which concerns on Example 5 of this invention. It is a cross-section figure of a multifrequency antenna concerning Example 6 of the present invention. It is sectional structure drawing of the multifrequency antenna which concerns on Example 7 of this invention. It is a cross-section figure of the multifrequency antenna concerning the present invention . It is a structural diagram of the multi-frequency antenna of the prior art (patent document 3) proposed previously. It is a structure figure of the multifrequency antenna of a prior art (patent document 1). It is a structure figure of the multifrequency antenna of a prior art (patent document 2).

Explanation of symbols

1: Feeding element
2: Feeding point
2a: Feed line
3: Parasitic element
4: Switch plate
5: Drive electrode
5a: Upper electrode
5b: Lower electrode
6: Pressure chamber
6a: Pressure part
7: Dielectric substrate
8: Flow path
9: Fluid guide plate
10: ground plane
11: Elastic thin film
12: Stopper
13: Conductive elastic body
14: MEMS pump
15: Heater
16: MEMS pump substrate
17: Heater substrate

Claims (13)

In the multi-frequency antenna switch that changes the transmission / reception frequency of the multi-frequency antenna by electrically connecting or disconnecting the feed antenna element including the feed point and the parasitic antenna element not including the feed point by moving the switch plate,
A pressure chamber provided in a dielectric substrate on which the antenna element is disposed, and in which the switch plate moves;
Pump means for feeding fluid into the pressure chamber for moving the switch plate with pressure in the pressure chamber;
Have
The switch plate in the pressure chamber is moved by the pressure of the fluid fed from the pump means to the pressure chamber, and the feeding antenna element including the feeding point and the parasitic antenna element not including the feeding point are connected < A multi-frequency antenna switch characterized by the above. The multi-frequency antenna switch according to claim 1,
A fluid substrate having a flow path for delivering fluid from the pump means to the pressure chamber;
Provided between the pressure chamber and the flow path of the fluid substrate, and controlling the movement of the switch plate in the pressure chamber by regulating the flow of fluid from the flow path of the fluid substrate to the pressure chamber. A switch for a multi-frequency antenna, comprising: a valve means for electrically connecting or disconnecting a feeding antenna element including the feeding point and a parasitic antenna element not including the feeding point by the switch plate. The multi-frequency antenna switch according to claim 1 ,
A switch for a multi-frequency antenna , wherein the pump means is installed for each pressure chamber . In the switch for multifrequency antennas in any one of Claims 1-3 ,
Before kissing switch plate, switch multi-frequency antenna according to claim Rukoto a conductive portion of the flat plate. In the switch for multifrequency antennas in any one of Claims 1-3 ,
Before kissing switch plate made of a conductive portion of the sheet to be bent by the pressure of the fluid, connecting the parasitic antenna element that does not include the feeding antenna elements the feed points including the feeding point at the conductive portion of the curved state multi-frequency switch for antenna according to claim to Rukoto. The multi-frequency antenna switch according to claim 5 ,
In the pressure chamber,
A switch for a multi-frequency antenna , comprising stopper means for preventing connection with the antenna element when the conductive portion of the switch plate is not curved . In the switch for multifrequency antennas in any one of Claims 1-3 ,
Before kissing switch plate is made of a conductive elastic material that expands by the pressure of the fluid,
The switch plate connects a feeding antenna element including the feeding point and a parasitic antenna element not including the feeding point in a state of being expanded by the pressure of the fluid,
A multi-frequency antenna switch characterized by electrically shutting off a feeding antenna element including the feeding point and a parasitic antenna element not including the feeding point in a state in which the pressure of the fluid disappears and is pre-shrinked . In the switch for multifrequency antennas in any one of Claims 1-7,
The switch for a multi-frequency antenna, wherein the fluid is a gas. In the switch for multi-frequency antennas according to any one of claims 1 to 27 ,
The switch for a multi-frequency antenna, wherein the fluid is a liquid. A multi-frequency antenna switch according to any one of claims 1 to 9,
Provided in the pressure chamber is an elastic thin film that expands with the pressure of the fluid fed from the pump means;
A switch for a multi-frequency antenna, wherein the switch plate is provided on the elastic thin film. In the switch for multifrequency antennas in any one of Claims 1-10 ,
Multi-frequency switch antenna before Kipo pump means is characterized by being made of MEMS. The multifrequency antenna switch according to any one of claims 1 to 11 ,
A switch for a multi-frequency antenna, characterized in that as the pump means, means for generating pressure to move the switch plate by expanding and contracting a fluid by heating with a heater is used. A multi-frequency antenna comprising the multi-frequency antenna switch according to any one of claims 1 to 12.

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