JP2008236578A - Radio wave distribution switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio wave distribution switch which distributes a radio wave supplied from a feeding side to a plurality of waveguides with only loss of the amount of one switch. <P>SOLUTION: A switch 20 provided at an entrance for a radio wave from a feed port of a waveguide in each sub-sector antenna 104 includes a conductor bar 12, an annular slot provided having its center at a joint port between the conductor rod 12 and a conductor wall of the waveguide, a pair of varactor diodes loaded in the annular slot and connected in electrically reverse series, and a voltage applying means of applying a voltage to the pair of varactor diodes. Voltage applying means control voltages applied to pairs of varactor diodes to control propagaion of radio waves to waveguides provided with respective switches 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radio wave distribution switch, and more particularly, to a radio wave distribution switch that distributes a radio wave supplied from a power feeding side to a plurality of waveguides with only a loss of one switch.

  As a conventional technique for controlling propagation of radio waves, for example, in a sector antenna 10 composed of a plurality of subarrays 100 as shown in FIG. 9, radio waves fed from the feeding side are turned on or off of an RF switch (two-branch switch) 101. There is a technique for controlling the radio wave propagation to the feeder line 102 leading to each sub-array 100 by switching. Each sub-array 100 shown in the figure forms a parallel plate waveguide whose top and bottom surfaces are conductors (printed circuit boards) and whose inside is a dielectric, and radio waves supplied through the feeder line 102 pass through the parallel plate waveguides. Propagated and emitted from the slot 103 provided in each subarray 100.

In addition, as a specific technique for controlling conventional radio wave propagation, Patent Document 1 listed below discloses a radio wave of a higher-order propagation mode generated by a discontinuous body formed in a feeding waveguide as a waveguide length of the discontinuous portion. A waveguide slot antenna device that emits light by emission slots formed on a wide wall surface before and after the hand direction is described.
JP 2006-5598 A

  However, in the above-described conventional technique for controlling the radio wave propagation to the feed line 102 that leads the radio wave fed from the power feeding side to each sub-array 100 by turning the RF switch 101 ON or OFF, for example, as shown in FIG. In order to control the radio wave for each of the 100, it is necessary to use the RF switch 101 arranged in three stages, and there is a problem that the loss increases according to the number of stages.

  An object of the present invention is to provide a radio wave distribution switch that distributes a radio wave supplied from a power feeding side to a plurality of waveguides with only a loss of one switch.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes radio waves propagating from the power supply side to a plurality of waveguides, and is arranged so as to be in parallel with the propagation of radio waves from the power supply side. A conductor rod provided so as to bridge two opposing conductor walls forming the waveguide at the entrance of the radio wave propagating from the power feeding side of the waveguide, and one junction of the conductor rod and the conductor wall And a pair of varactor diodes mounted in the annular slot and connected in an electrically reverse series, and the pair of varactor diodes. On the other hand, it comprises voltage applying means for applying a voltage.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes radio waves propagating from the power supply side to a plurality of waveguides, and is arranged in parallel with the propagation of radio waves from the power supply side. In addition, a conductor rod provided so as to bridge two opposing conductor walls forming the waveguide at the entrance of the radio wave propagating from the power feeding side in each waveguide, two conductor rods and the conductor wall An annular slot provided on the conductor wall around each of the joints, and a varactor diode loaded in each of the annular slots, the varactor diode loaded in one of the annular slots; A varactor diode in which the varactor diode loaded in the other annular slot is electrically in reverse series, and a voltage is applied to the varactor diode. Consisting of a voltage applying means.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes radio waves propagating from the power supply side to a plurality of waveguides, and is arranged in parallel with the propagation of radio waves from the power supply side. In addition, a conductor rod provided so as to bridge two opposing conductor walls forming the waveguide at the entrance of the radio wave in each waveguide, and the junction between the conductor rod and the conductor wall as a center. An annular slot provided in the conductor wall, an RF switch loaded in the annular slot, and voltage applying means for applying a voltage to the RF switch.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes radio waves propagating from the power supply side to a plurality of waveguides, and a plurality of branches branching from main waveguides that propagate the radio waves from the power supply side. In the waveguide, a conductor rod provided so as to bridge two opposing conductor walls forming the waveguide at a branch point of the radio wave from the main waveguide, and one of the conductor rod and the conductor wall An annular slot provided in the conductor wall with the junction as the center, a pair of varactor diodes connected in an electrically reverse series, loaded in the annular slot, and the pair of varactors Voltage applying means for applying a voltage to the diode.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes radio waves propagating from the power supply side to a plurality of waveguides, and a plurality of branches branching from main waveguides that propagate the radio waves from the power supply side. In the waveguide, a conductor rod provided so as to bridge two opposing conductor walls forming the waveguide at a branching point of the radio wave from the main waveguide, two conductor rods, the conductor rod and the conductor wall An annular slot provided on the conductor wall around each of the joints, and a varactor diode loaded in each of the annular slots, the varactor diode loaded in one of the annular slots; A varactor diode in which the other varactor diode loaded in the other annular slot is electrically in reverse series, and a voltage applied to the varactor diode. Consisting of the application means.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes radio waves propagating from the power supply side to a plurality of waveguides, and a plurality of branches branching from main waveguides that propagate the radio waves from the power supply side. In the waveguide, a conductor rod provided so as to bridge two opposing conductor walls forming the waveguide at a branch point of the radio wave from the main waveguide, and one of the conductor rod and the conductor wall An annular slot provided on the conductor wall with the joint as the center, an RF switch loaded in the annular slot, and a voltage applying means for applying a voltage to the RF switch.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes the radio wave propagating from the power supply side to a plurality of waveguides, and is provided in an opening portion that is provided between the waveguides and through which the radio waves can propagate. A plurality of pairs of varactor diodes installed so as to be electrically in anti-series and voltage applying means for applying a voltage to the plurality of pairs of varactor diodes.

  The radio wave distribution switch of the present invention is a radio wave distribution switch that distributes the radio wave propagating from the power supply side to a plurality of waveguides, and is provided in an opening portion that is provided between the waveguides and through which the radio waves can propagate. It comprises an installed RF switch and voltage applying means for applying a voltage to the RF switch.

  According to the present invention, it is possible to control distribution of radio waves propagating from the power supply side to a plurality of waveguides through voltage application to one switch. Since the distributed radio wave passes through only one switch, the radio wave can be distributed with a loss of one switch regardless of the number of radio wave distributions.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A and 1B are diagrams showing an example of a configuration according to the first embodiment of the present invention. Here, a description will be given by taking, as an example, control of distribution of radio waves to each of the eight sub-sector antennas 104 constituting the sector antenna. 1A is a top view of the sector antenna, and FIG. 1B is a cross-sectional view of the sector antenna.

  In FIG. 1, point O is a power supply port. Each sub-sector antenna 104 includes a dielectric substrate composed of conductor walls 60 and 61 and a dielectric portion 14 provided on the top and bottom surfaces, and a conductor rod 12 provided at a predetermined interval in the dielectric substrate. The slot 200 radiates radio waves from the power supply port and the switch 20. A portion of the dielectric substrate surrounded by two rows of conductor rods surrounded by dotted lines shown in FIG. 1A forms a parallel plate waveguide, and the two rows of conductor rods are parallel plate. It functions as a waveguide wall (conductor wall). In the embodiment of the present invention, the conductor rod 12 may be a conductor through hole (conductor via) having a structure in which a metal is applied to the inner surface of a hollow through hole.

  As shown in FIG. 1A, each of the parallel plate waveguides is radially arranged around the point O so as to be in parallel with the propagation of the radio wave from the point O that is the power feeding port. Yes. The switch 20 is provided at the entrance of the radio wave propagating from the power supply port (power supply side) in each waveguide. The switch 20 is a radio wave distribution switch that distributes radio waves propagating from the power feeding side to a plurality of waveguides (parallel plate waveguides).

  FIG. 2 is a partially enlarged view of a parallel plate waveguide in the vicinity of the switch shown in FIG. The switch 20 described above with reference to FIG. 1A includes a conductor rod 12 provided so as to bridge two opposing conductor walls 60 and 61 forming a parallel plate waveguide, An annular slot (annular slot) 201 is provided in the conductor wall 60 around the junction with the conductor wall 60. The annular slot 201 is loaded with a pair of varactor diodes 202 that are electrically connected in reverse series. Note that reference numeral 203 denotes a power source, 204 denotes a resistor, and 205 denotes a wiring. The power source 203, the resistor 204, and the wiring 205 constitute a voltage applying unit. One end of each varactor diode constituting the pair of varactor diodes 202 is connected to the conductor wall 60.

  The voltage applying means can apply a DC reverse bias voltage to the pair of varactor diodes 202. For example, when no voltage is applied to the varactor diode 202, the absolute value of the reactance value of the varactor diode 202 is small, and the conductor rod 12 loaded with the varactor diode 202 functions as a conductor wall of a parallel plate waveguide. Fulfill. That is, the switch 20 including the varactor diode 202 is in a “closed” state, and the power supply shown in FIG. 1A is supplied to the parallel plate waveguide provided with the switch 20 in the “closed” state. Propagation of radio waves from the mouth (point O) is blocked.

  The absolute value of the reactance value of the varactor diode 202 increases as the value of the applied voltage increases. Therefore, when the absolute value of the reactance value of the varactor diode 202 is large, the function as the conductor wall of the parallel plate waveguide of the conductor rod 12 loaded with the varactor diode 202 is not sufficiently exhibited. That is, the switch 20 including the varactor diode 202 is in an “open” state, and radio waves from the power feeding port (point O) are transmitted to the parallel plate waveguide provided with the switch 20 in the “open” state. Propagate. Therefore, for example, each switch 20 is provided by turning on or off the voltage applied to the varactor diode 202 and setting each switch 20 shown in FIG. 1A to an “open” state or a “closed” state. The radio wave can be propagated or not propagated to the parallel plate waveguide. As a result, for example, as shown in FIG. 1 (A), the two switches 20 are set in the “open” state, and the radio waves are propagated to the parallel plate waveguides on which the two switches 20 are provided. Thus, the six switches 20 are put in the “closed” state, and the propagation of the radio wave to the parallel plate waveguide provided with each of the six switches 20 can be cut off. In other words, the switch 20 functions as a window that propagates or does not propagate radio waves by opening and closing. Note that the voltage applied to the varactor diode 202 is low power consumption because it is used in reverse bias.

  According to one embodiment of the present invention, the value of the voltage applied to the varactor diode 202 is controlled to control the distribution of radio waves propagating to the parallel plate waveguide provided with each switch 20. According to the embodiment of the present invention, not only the binary control of setting the switch 20 to the “open” state or the “closed” state, but also the radio wave propagating to the parallel plate waveguide provided with each switch 20. Distribution (transmittance) can be controlled.

  According to one embodiment of the present invention, the switch 20 includes a conductor rod 12 provided to bridge two opposing conductor walls 60, 61 forming a parallel plate waveguide, as shown in FIG. Two annular slots 201 and 201 ′ provided in the conductor walls 60 and 61 around the joint portions of the conductor rod 12 and the conductor walls 60 and 61, and the annular slots 201 and 201 ′, respectively. A varactor diode 202, wherein the varactor diode loaded in one annular slot and the varactor diode loaded in the other annular slot are electrically in reverse series, 202 ′ and voltage applying means (power supply 203, resistor 204, wiring 205) for applying a voltage to the varactor diodes 202, 202 ′. It may be adopted.

  The switch 20 is configured as shown in FIG. 3, so that it is necessary as compared with the case where a pair of varactor diodes 202 are provided in an annular slot provided around one junction of the conductor rod 12 and the conductor wall. Thus, the loading space of the varactor diode 202 can be reduced, and the loading space can be easily secured.

  According to the present invention, by controlling the voltage applied to the varactor diode 202 included in the switch 20 shown in FIG. 1, the radio waves for each of the plurality of subarrays 100 are transmitted as in the prior art described above with reference to FIG. Propagation of radio waves from the power supply port to each waveguide can be controlled in one stage without using the RF switches 101 arranged in a plurality of stages for control. As a result, it is possible to distribute the radio wave supplied from the power feeding side to the plurality of waveguides while suppressing loss with a simple configuration.

  According to one embodiment of the present invention, the switch 20 shown in FIG. 1A described above is replaced with, for example, an RF instead of the varactor diode 202 shown in FIG. 2 instead of the configuration described above with reference to FIG. A configuration may be adopted in which the switch is loaded in the annular slot 201. The switch 20 having such a configuration includes a conductor rod 12 provided so as to bridge two opposing conductor walls 60 and 61 forming a parallel plate waveguide, and a junction between the conductor rod 12 and the conductor wall 60. An annular slot 201 provided in the conductor wall with the center as a center, an RF switch loaded in the annular slot 201, and voltage applying means for applying a voltage to the RF switch.

  Then, by controlling the voltage applied to the RF switch from the voltage applying means, the propagation of the radio wave in each waveguide provided with the switch 20 is controlled on and off, and the radio wave is propagated or propagated. I will not let you.

  FIG. 4 is a diagram showing an example of a configuration according to the second embodiment of the present invention. FIG. 4A is a top view of a plurality of waveguides formed by rows of conductor rods 12 (conductor rod rows) provided at predetermined intervals in the dielectric substrate. ) Is a cross-sectional view of the waveguide shown in FIG. 4A taken along line AA. 4A is a main waveguide that is a main waveguide that propagates radio waves from the power supply side, and 31-1 to 31-5 are branch waveguides that branch from the main waveguide 30. As shown in FIG. 4A, the switch 20 is provided in series with respect to the propagation of the radio wave in the main waveguide 30 at the branch point of the radio wave from the main waveguide 30 in each branch waveguide. Yes. The switch 20 has the configuration described above with reference to FIG. 2 or the configuration described above with reference to FIG. That is, each switch 20 includes, for example, as shown in FIG. 2 described above, an annular slot 201 provided in the conductor wall 60 around the junction between the conductor rod 12 and the conductor wall 60, and the annular slot 201. And a pair of varactor diodes 202 electrically connected in anti-series. Each switch 20 includes, for example, two annular rings provided on the conductor walls 60 and 61 with the joint portion between the conductor rod 12 and the conductor walls 60 and 61 as the center, as shown in FIG. Varactor diodes loaded in each of the annular slots 201 and 201 ′, and loaded in one annular slot and the other annular slot. The varactor diodes 202 and 202 'are electrically connected in series with the varactor diode. Here, a case where the switch 20 adopts the configuration described above with reference to FIG. 2 will be described as an example.

  In the second embodiment of the present invention, for example, the voltage applied to the varactor diode 202 included in the switch 20 shown in FIG. 4A is controlled. The magnitude of the reactance of the varactor diode 202 is controlled by the magnitude of the voltage applied to the varactor diode 202, and the distribution (transmittance) and phase of the radio waves branched from the main waveguide 30 to each branch waveguide are controlled. Control. The arrows shown in FIG. 5 indicate the distribution of radio waves branched from the main waveguide 30 to each branch waveguide. The horizontal width of each arrow indicates the amount of radio waves that propagate (the amplitude).

  According to an embodiment of the present invention, the voltage applied to the pair of varactor diodes 202 is controlled to be turned on and off, and a radio wave from the main waveguide 30 is branched to one branch waveguide, and the other branch waveguides. Alternatively, the radio wave from the main waveguide 30 may be controlled so as not to be branched.

  Further, according to an embodiment of the present invention, the switch 20 shown in FIG. 4A is replaced with the configuration described above with reference to FIG. 2, for example, instead of the varactor diode 202 shown in FIG. A configuration in which the RF switch is loaded in the annular slot 201 may be adopted. By controlling the voltage applied to the RF switch included in the switch 20 having such a configuration, the radio wave from the main waveguide 30 is branched to one branch waveguide, and the other branch waveguide is main. You may make it control so that the electromagnetic wave from the waveguide 30 may not be branched.

  As a method of applying a voltage to the varactor diode 202 included in the switch 20 shown in FIG. 4A, for example, as shown in FIG. 6, a voltage is applied from one power source 203 to a plurality of varactor diodes 202. Also good. If a voltage is applied from one power source 203 to a plurality of varactor diodes 202, a plurality of switches 20 can be controlled by one power source 203.

  FIG. 7 is a diagram illustrating an example of a configuration according to the third exemplary embodiment of the present invention. FIG. 7A is a side view of the parallel plate waveguides 40 and 41 sharing the conductor plate 43. FIG. 7B is a cross-sectional view of the parallel plate waveguide shown in FIG. A hatched portion in FIG. 7B is a conductor portion. In this example, it is assumed that radio waves propagating from the power feeding side are supplied to the parallel plate waveguide 40 in the initial state.

  As shown in FIGS. 7A and 7B, the conductor plate 43 provided between the parallel plate waveguide 40 and the parallel plate waveguide 41 (or shared by both the parallel plate waveguides) has a radio wave. Are provided with four pairs of varactor diodes 202 connected in reverse series, and voltage applying means for applying a voltage to the four pairs of varactor diodes 202. The switch which consists of is provided. The voltage applying means includes a power source 203, a resistor 204, and a wiring 205. That is, the switch is a radio wave distribution switch that distributes radio waves propagating from the power supply side to a plurality of waveguides, and is provided between each of the waveguides (parallel plate waveguides 40 and 41). A plurality of pairs of varactor diodes 202 installed in the possible openings 42 and loaded so as to be electrically in anti-series, and voltage applying means for applying a voltage to the plurality of pairs of varactor diodes 202 are included.

  The voltage application means of the switch applies a voltage to the four pairs of varactor diodes 202 to control the magnitude of reactance of the varactor diodes 202, and is parallel from the parallel plate waveguide 40 through the opening 42. The distribution of the radio wave propagating to the flat waveguide 41 is controlled. Of course, in the present invention, the number of pairs of varactor diodes 202 included in the switch is not limited to four, and the switch may include a plurality of arbitrary pairs of varactor diodes 202.

  FIG. 8 is a diagram for explaining the control of the distribution of radio waves to the waveguide according to the third embodiment of the present invention. In a state in which no voltage is applied to the pair of varactor diodes 202 included in the switch described above with reference to FIG. . As a result, for example, as indicated by the arrow in FIG. 8A, the radio wave from the power feeding side propagates through the parallel plate waveguide 40 and does not propagate through the parallel plate waveguide 41. When a voltage is applied to the pair of varactor diodes 202 constituting the switch, the absolute value of the reactance value of the varactor diode 202 is increased, and the switch is in the “open” state. As a result, for example, as indicated by an arrow in FIG. 8B, the radio wave from the power feeding side that propagates through the parallel plate waveguide 40 propagates to the parallel plate waveguide 41 through the opening 42.

  According to one embodiment of the present invention, the switch described above with reference to FIG. 7 can be replaced with, for example, the plurality of pairs of varactor diodes 202 shown in FIG. A configuration in which an RF switch is installed in the opening 42 may be adopted. By controlling the voltage applied to the RF switch included in the switch having such a configuration, the distribution of radio waves propagating from the parallel plate waveguide 40 to the parallel plate waveguide 41 through the opening 42 is controlled. May be.

It is a figure which shows an example of the structure which concerns on the 1st Embodiment of this invention. It is the elements on larger scale of the waveguide of the parallel plate near the switch. It is a figure which shows the other structural example of a switch. It is a figure which shows an example of the structure which concerns on the 2nd Embodiment of this invention. It is a figure which shows distribution of the electromagnetic wave branched to each branching waveguide. It is a figure which shows the other example of the application method of the voltage to the varactor diode with which a switch is provided. It is a figure which shows an example of the structure which concerns on the 3rd Embodiment of this invention. It is a figure explaining the control of distribution of the electromagnetic wave to the waveguide in the 3rd Embodiment of this invention. It is a figure which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sector antenna 12 Conductor bar 14 Dielectric part 20 Switch 30 Main waveguide 31-1, 31-2, 31-3, 31-4, 31-5 Branching waveguide 40, 41 Parallel plate waveguide 42 Opening 43 Conductor Plate 60, 61 Conductor wall 100 Sub-array 101 RF switch 102 Feed line 103, 200 Slot 104 Sub-sector antenna 201, 201 'Circular slot 202, 202' Varactor diode 203 Power supply 204 Resistance 205 Wiring

Claims (8)

A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
Two opposing conductor walls forming the waveguide are bridged to the entrance of the radio wave propagating from the power supply side in each waveguide arranged so as to be in parallel with the radio wave propagation from the power supply side. A conductor rod provided as follows:
An annular slot provided in the conductor wall around one joint between the conductor rod and the conductor wall;
A pair of varactor diodes mounted in the annular slot and connected electrically in anti-series;
A radio wave distribution switch comprising voltage applying means for applying a voltage to the pair of varactor diodes. A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
Two opposing conductor walls forming the waveguide are bridged to the entrance of the radio wave propagating from the power supply side in each waveguide arranged so as to be in parallel with the radio wave propagation from the power supply side. A conductor rod provided as follows:
An annular slot provided in the conductor wall around each of the two joints between the conductor rod and the conductor wall;
A varactor diode loaded in each of the annular slots, wherein the varactor diode loaded in one annular slot and the varactor diode loaded in the other annular slot are electrically in reverse series. A varactor diode,
A radio wave distribution switch comprising voltage applying means for applying a voltage to the varactor diode. A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
Conductor rod provided to bridge the two opposing conductor walls forming the waveguide at the entrance of the radio wave in each waveguide arranged so as to be in parallel with the propagation of the radio wave from the power feeding side When,
An annular slot provided in the conductor wall around one joint between the conductor rod and the conductor wall;
An RF switch loaded in the annular slot;
A radio wave distribution switch comprising: voltage applying means for applying a voltage to the RF switch. A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
Two opposing conductor walls forming the waveguide are bridged at a branching point of the radio wave from the main waveguide in a plurality of branch waveguides branched from the main waveguide propagating the radio wave from the power supply side. A conductor rod provided as follows:
An annular slot provided in the conductor wall around one joint between the conductor rod and the conductor wall;
A pair of varactor diodes mounted in the annular slot and connected electrically in anti-series;
A radio wave distribution switch comprising voltage applying means for applying a voltage to the pair of varactor diodes. A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
Two opposing conductor walls forming the waveguide are bridged at a branching point of the radio wave from the main waveguide in a plurality of branch waveguides branched from the main waveguide propagating the radio wave from the power supply side. A conductor rod provided as follows:
An annular slot provided in the conductor wall around each of the two joints between the conductor rod and the conductor wall;
A varactor diode loaded in each of the annular slots, wherein the varactor diode loaded in one annular slot and the varactor diode loaded in the other annular slot are electrically in reverse series. A varactor diode,
A radio wave distribution switch comprising voltage applying means for applying a voltage to the varactor diode. A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
Two opposing conductor walls forming the waveguide are bridged at a branching point of the radio wave from the main waveguide in a plurality of branch waveguides branched from the main waveguide propagating the radio wave from the power supply side. A conductor rod provided as follows:
An annular slot provided in the conductor wall around one joint between the conductor rod and the conductor wall;
An RF switch loaded in the annular slot;
A radio wave distribution switch comprising voltage application means for applying a voltage to the RF switch. A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
Installed between each waveguide, installed in the opening where radio waves can propagate,
Multiple pairs of varactor diodes loaded in electrical anti-series;
A radio wave distribution switch comprising voltage applying means for applying a voltage to the plurality of pairs of varactor diodes. A radio wave distribution switch that distributes radio waves propagating from a power supply side to a plurality of waveguides,
An RF switch installed between each waveguide and installed in an opening through which radio waves can propagate;
A radio wave distribution switch comprising voltage application means for applying a voltage to the RF switch.

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