JPH11183541A - Dummy antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the dummy antenna system which can test a communication machine in environment close to an actual field and also conduct a flexible test by simplifying the internal constitution. SOLUTION: A dummy antenna device 30 connected to mobile stations 321 and 322 and radio base stations 341 and 342 by coaxial cables 311 and 312 , and 331 and 332 is equipped with an electromagnetic shield chamber 35. The electromagnetic shield chamber 35 has antenna terminals inside and antennas 371 and 372 , and 381 and 382 which can emit transmit and receive signals from the mobile stations and radio base stations as radio waves are connected. The radio waves emitted from those antennas are freely propagate in the electromagnetic shield chamber 35 and a communication machine can be tested in environment close to an actual field. Further, the transmit and receive signals can be turned on and off and adjusted in intensity between the mobile stations and radio base stations by switches and variable attenuators.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pseudo antenna system for testing a mobile communication device, and more particularly to a pseudo antenna system for performing a small-scale experiment of a mobile communication device indoors.

[0002]

2. Description of the Related Art In order to test an antenna between a mobile communication device as a mobile station and a radio base station, it is desirable to actually install an antenna outdoors and perform actual communication. However, it is necessary to apply for a radio station license to emit radio waves,
Due to various reasons such as interference from unnecessary radio waves from the outside, field environment such as weather conditions, and deterioration of work efficiency for large-scale test work, indoor Small-scale experiments are often used. In this small-scale experiment in an indoor space or the like, a pseudo antenna system for testing an antenna unit so that radio waves are not transmitted to the outside is used.

FIG. 3 shows an outline of the configuration of such a conventional pseudo antenna system. The pseudo-antenna system includes a pseudo antenna device 10, the mobile station 12 _1, 12 ₂ connected by a coaxial cable 11 _1, 11 ₂ thereto, is further connected with a pseudo-antenna device 10 and the coaxial cable _131-134 and and a wireless base station 14 ₁ to 14 _2. The simulated antenna device 10 includes a distributor / synthesizer 15 and a variable attenuator 1.
6 and a circulator 17 are installed as a housing having a structure in which a pseudo antenna is constructed by combining them in a complicated manner.

For example, a transmission signal from _{one of} the radio base stations 14 ₁ and 14 ₂ is transmitted by coaxial cables 13 ₁ and 13 ₁ , respectively.
3 ₃ through the input to the variable attenuator 16 _1, 16 _2. The variable attenuators 16 ₁ and 16 ₂ can be adjusted so that a signal of a desired strength is transmitted for a test. After signal transmitted in this way, which is synthesized by the distributor combiner 15 _1, the variable attenuator 16 ₃ by the distributor combiner 15 _2, 16
Divided into _four . Also in these variable attenuators 16 ₃ and 16 ₄ , the receiving strength is adjusted to a desired value, and the circulators 17 ₁ and 17 ₂ respectively control the coaxial cables 11 ₁ and 1 2.
Sent to the mobile station 12 _1, 12 ₂ via the 1 _2.

A transmission signal from _{one of} the mobile stations 12 ₁ and 12 ₂ is input to variable attenuators 16 ₅ and 16 ₆ by circulators 17 ₁ and 17 ₂ via coaxial cables 11 ₁ and 11 ₂ , respectively. Is done. This variable attenuator 1
6 _5, 16 signal of a desired intensity for the ₆ test can be adjusted to be sent. After signal transmitted in this way, which is synthesized by the distributor combiner 15 _3, it is distributed to the variable attenuator 16 _7, 16 ₈ by the distributor combiner 15 _4. In this variable attenuator 16 _7, 16 _8, and adjusted to a desired reception intensity, a coaxial cable 13, respectively _2, 13 ₄
Are sent to the wireless base stations 14 ₁ and 14 ₂ via the.

[0006]

In such a conventional pseudo antenna system, a pseudo antenna is constructed by wiring a coaxial cable, a distributor / synthesizer, and a variable attenuator in a complicated manner. Was spent unfairly. Further, when the number of mobile stations and radio base stations is increased in the pseudo antenna system, it is necessary to reconfigure the pseudo antenna system by complicated re-wiring of the distributor / synthesizer and the variable attenuator using a coaxial cable.

Further, as disclosed in, for example, "Anechoic Chamber Apparatus" in Japanese Patent Application Laid-Open No. Hei 5-2491639, an inspection process at the time of manufacturing communication equipment is performed in an anechoic chamber which is a large-scale facility. However, in order to measure a predetermined inspection item at the time of inspection during manufacturing, external interference radio waves are completely shut off and connected to an external measuring instrument. That is, the communication device is inspected for desired performance in an ideal environment.

However, in order to manufacture a communication device, it is necessary to determine the performance for the inspection through a number of experiments.
An experiment in an environment close to the actual field is required. However, in such a communication device development environment or the like, an experiment of another communication device is often performed in the vicinity, and an experiment cannot be actually performed in a real field.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pseudo antenna system capable of performing a test of a communication device in an environment close to a real field and simplifying an internal configuration to perform a flexible test. It is in.

[0010]

According to the present invention, (a) a plurality of communication means for transmitting and receiving radio waves;
(B) A space that is electromagnetically shielded from the outside and has an antenna connected to each of these communication means inside, and transmits and receives a radio signal corresponding to a signal transmitted and received between the communication means between these antennas. And a shielded room in the pseudo antenna system.

According to the second aspect of the present invention, there are provided (a) a plurality of communication means for transmitting and receiving radio waves, and (b) a plurality of antennas in a space which is electromagnetically shielded from the outside and inside. A pseudo antenna system is provided with a shielded room for transmitting and receiving radio signals between these antennas, and (c) connecting means for connecting a communication means and an antenna inside the shielded room so as to electrically transmit and receive signals.

That is, according to the first or second aspect of the present invention, in a shielded room which is electromagnetically shielded from the outside,
An antenna connected to communication means outside the shielded room is provided inside the shielded room, and it is possible to perform transmission and reception tests of communication equipment in an environment close to the actual field, corresponding to radio wave transmission and reception by the communication means. I have. This eliminates the need for a pseudo antenna, which has conventionally been realized by complicated wiring such as a coaxial cable. Further, in the invention described in claim 2, the antenna inside the shield room and the communication means outside the shield room are electrically connected.

According to a third aspect of the present invention, in the pseudo antenna system according to the second aspect, the connection means includes a blocking means for blocking transmission and reception between the communication means and the corresponding antenna in the shielded room. It is characterized by doing.

That is, according to the third aspect of the present invention, the transmission and reception signals between the communication means and the antenna in the shielded room which is electromagnetically shielded from the outside are electrically connected, and the transmission and reception signals are further connected by the blocking means. That can be cut off.

According to a fourth aspect of the present invention, in the simulated antenna system according to the second or third aspect, the connection means controls the strength of the transmission / reception signal between the communication means and the corresponding antenna inside the shielded room. It is characterized by comprising adjusting means for adjusting.

That is, according to the fourth aspect of the present invention, the transmission / reception signals between the communication means and the antenna located inside the shielded room which is electromagnetically shielded from the outside are electrically connected, and the transmission / reception signals are further adjusted by the adjustment means. The intensity of the light can be adjusted.

According to a fifth aspect of the present invention, in the simulated antenna system according to the first to fourth aspects, the communication means is a signal generator, and any one of the antennas inside the shielded room is connected to the remaining shielded room. This is characterized in that a radio wave different from a radio wave transmitted and received between the antennas is generated as an interference wave.

That is, according to the fifth aspect of the present invention, the radio wave corresponding to the electric signal generated by the signal generator can be radiated from the antenna in the shielded room as an interfering radio wave different from the radio wave transmitted and received between other antennas. I can do it.

According to a sixth aspect of the present invention, in the pseudo antenna system according to the second to fifth aspects, the connection between the communication means and the antenna inside the shielded room by the connection means is connected by a coaxial cable. Features.

That is, according to the invention, the communication means outside the shield room and the antenna inside the shield room are connected by a coaxial cable.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

First Embodiment

FIG. 1 schematically shows the configuration of a pseudo antenna system according to a first embodiment of the present invention. The simulated antenna system has a simulated antenna device 30, and the simulated antenna device 30 includes a coaxial cable 3
The mobile station includes mobile stations 32 ₁ and 32 ₂ via 11 ₁ and 31 ₂ and wireless base stations 34 ₁ and 34 ₂ via coaxial cables 33 ₁ and 33 ₂ . The pseudo antenna device 30 has an electromagnetic shield room 35 that is electromagnetically shielded from the outside, and has a plurality of antenna terminals inside the electromagnetic shield room 35, and these antennas 37 ₁ , 37 ₂ , 38 ₁ and 38 ₂ are connected. Radio waves from these antennas are designed to freely propagate inside the electromagnetic shield room without leaking outside.

The antennas 37 ₁ , 37 ₂ , 38 ₁ , and 38 ₂ provided inside the electromagnetic shield room 35 are respectively connected to the mobile station 3.
2 _1, 32 ₂ and the signal from the radio base station 33 _1, 33 ₂ are connected so as to be transmitted and received through the terminal. Further, between the mobile station 32 ₁ and antenna 37 _1, the switch 39 ₁ and the variable attenuator 40 ₁ via the coaxial cable 31 ₁ has been inserted, an electrical signal between the mobile station 32 ₁ and antenna 37 ₁ by the switch 39 ₁ can be turned on and off,
And it is capable of adjusting the signal strength by the variable attenuator 40 _1. Similarly, the mobile station 32 ₂ and the antenna 37 switches 39 ₂ via a coaxial cable 31 ₂ Between ₂ and the variable attenuator 40 _2, the coaxial cable 33 ₁ is between the radio base station 34 ₁ and antenna 38 ₁ Switch 41 through
₁ and the variable attenuator 42 ₁ are connected to the radio base station 34 ₂ and the antenna 3
8 Between ₂ switch 41 ₂ and the variable attenuator 42 ₂ via a coaxial cable 33 ₂ are respectively inserted.

In such a pseudo antenna system, for example, a carrier transmitted from the mobile station 32 ₁ is input to the pseudo antenna device 30 via the coaxial cable 31 ₁ . In pseudo antenna device 30, the mobile station 32 ₁ by the switch 39 ₁
And to be able to select whether or not to test the carrier from, it can be switched off 39 ₁ if unnecessary test. When testing via a switch 39 _1, it is input to the variable attenuator 40 _1. In the variable attenuator 40 _1, the desired can be adjusted to the signal strength to be tested, so as to be emitted as a radio wave from the antenna 37 ₁ of the electromagnetic shield chamber 35 in response to the signal of the desired strength I have.

The radio wave emitted from the antenna 37 ₁ propagates freely in the electromagnetic shield room 35. The carrier waves received by the antennas 38 ₁ and 38 ₂ in the electromagnetic shield chamber 35 are input to the variable attenuators 42 ₁ and 42 ₂ . Here, after being adjusted to a desired reception level, it is sent to the radio base stations 34 ₁ and 34 ₂ via the switches 41 ₁ and 41 ₂ and the coaxial cables 33 ₁ and 33 ₂ , respectively.

[0028] In the case of a mobile station from a radio base station, the route follows the reverse of the above, and a description thereof will be omitted.

As described above, in the pseudo antenna system according to the first embodiment, in the electromagnetic shield room 35 in which transmission and reception signals between the mobile stations 32 ₁ and 32 ₂ and the radio base stations 34 ₁ and 34 ₂ are electrically connected. Antennas 37 ₁ , 37 ₂ , 38
So that it can be tested by a radio wave between _1, 38 _2. As a result, not only the conventionally required components such as a circulator, distributor / synthesizer, and coaxial cable can be significantly reduced, but also a test based on free propagation of radio waves close to the actual field can be performed.

Second Embodiment

FIG. 2 shows an outline of the configuration of a pseudo antenna system according to a second embodiment of the present invention. The same elements as those of the pseudo antenna system according to the first embodiment of the present invention shown in FIG. 1 are denoted by the same reference numerals, and the description thereof will not be repeated. In the pseudo antenna system according to the second embodiment, a signal generator 54 is connected to a pseudo antenna device 45 via a coaxial cable 53. That is, in the electromagnetic shield chamber 46, a reception wave from the mobile station _{321 to} 323 as a radio wave from the antenna 50 ₁ to 50 _3, the radio base station 34
_1, the transmission and reception waves from 34 ₂ is adapted to be received as a radio wave from the antenna 51 _1, 51 _2. Further, based on the electric signal generated by the signal generator 54, a radio wave different from these transmission / reception radio waves can be emitted from the antenna 52 as a jamming radio wave.

The signal generator 54 is connected to the pseudo antenna 45 via a coaxial cable 53. Electrical signal generated by the signal generator 54 is input to the pseudo antenna device 45, can be from an antenna 52 in the electromagnetic shield chamber 46 via a switch 41 ₃ and the variable attenuator 42 _3, it emits a jamming 55 It has become.

The operation of the other elements of the pseudo antenna system is the same as that of the pseudo antenna system in the first embodiment, and a description thereof will be omitted.

As described above, in the pseudo antenna system according to the second embodiment, the mobile stations 32 _{1 to} 32 ₃ and the radio base station 3 are set in the electromagnetic shield room 46 by the signal generator 54.
4 so that it can be fired as a different jamming radio waves and _1, 34 transceiver No. between _2. This allows
Further, a communication device can be tested under an electromagnetic environment close to a real field, and a more flexible and complicated communication device can be tested.

In this embodiment, it is desirable that the antenna provided in the electromagnetically shielded room is small in size and low in gain.

In this embodiment, more complicated tests can be performed by increasing the number of antennas according to the space of the electromagnetic shield room.

[0037]

As described above, according to the first aspect of the present invention, the antenna connected to the communication means outside the shield room is provided inside the shield room inside the shield room electromagnetically shielded from the outside. In addition, the transmission / reception test of the communication device can be performed in an environment close to the actual field in correspondence with the transmission / reception of radio waves by the communication means. This eliminates the need for the simulated antenna part, which was conventionally realized by complicated wiring such as coaxial cables, so that the simulated antenna system configuration can be simplified and the test items can be flexibly changed. it can.

According to the second aspect of the present invention, an antenna connected to communication means outside the shield room is provided inside the shield room inside the shield room electromagnetically shielded from the outside. The transmission / reception test of the communication device can be performed in an environment close to the actual field, in correspondence with the transmission / reception of radio waves by the communication means that is connected to the network. This eliminates the need for the simulated antenna part, which was conventionally realized by complicated wiring such as coaxial cables, so that the simulated antenna system configuration can be simplified and the test items can be flexibly changed. it can.

Further, according to the third aspect of the present invention, the transmission and reception signals between the communication means and the antenna in the shielded room which is electromagnetically shielded from the outside are electrically connected. By cutting off the transmission / reception signals, a test for a specific communication means can be performed in an environment close to a real field in a shielded room.

Further, according to the fourth aspect of the present invention, the transmitting and receiving signals between the communication means and the antenna inside the shielded room which is electromagnetically cut off from the outside are electrically connected. By adjusting the intensity of the transmission / reception signal, it becomes possible to create an environment close to the actual field in the shielded room, or to create a test environment in a specific case.

Further, according to the fifth aspect of the present invention, a radio wave corresponding to the electric signal generated by the signal generator is emitted from the antenna in the shielded room as a jamming radio wave different from the radio wave transmitted and received between other antennas. As a result, a test environment closer to the actual field can be created.

Further, according to the invention described in claim 6,
Since the communication means and the antenna connection inside the shield chamber are connected by a coaxial cable, it is possible to minimize mixing of noise due to the connection between the communication means and the antenna.

[0043]

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an outline of a configuration of a pseudo antenna system using a pseudo antenna device according to a first embodiment of the present invention.

FIG. 2 is a system configuration diagram showing an outline of a configuration of a pseudo antenna system using a pseudo antenna device according to a second embodiment of the present invention.

FIG. 3 shows an outline of a configuration of a pseudo antenna system using a conventionally proposed pseudo antenna device.

[Explanation of symbols]

Reference Signs List 30 pseudo antenna device 31 _{1 to} 31 ₂ , 33 _{1 to} 33 ₂ coaxial cable 32 _{1 to} 32 ₂ mobile station 34 _{1 to} 34 ₂ radio base station 35 electromagnetic shield room 37 _{1 to} 37 ₂ , 38 _{1 to} 38 ₂ antenna 39 ₁ ~ 39 _2, 41 ₁ to 41 ₂ switch 40 _{1-40 2,} 42 ₁ to 42 ₂ variable attenuator

Claims (6)

[Claims] A plurality of communication means for transmitting and receiving radio waves; and a space which is electromagnetically shielded from the outside and has an antenna internally connected to each of the communication means. And a shield room for transmitting and receiving a radio signal corresponding to the signal between these antennas. 2. A plurality of communication means for transmitting and receiving radio waves, and a shielded room which is electromagnetically shielded from the outside, has a plurality of antennas inside, and transmits and receives radio signals between these antennas. A pseudo antenna system comprising: a connection unit for electrically transmitting and receiving signals transmitted and received between the communication unit and an antenna inside the shielded room. 3. The communication device according to claim 2, wherein the connection unit includes a blocking unit configured to block a transmission / reception signal between the communication unit and a corresponding antenna in the shield room.
A pseudo antenna system as described. 4. The connection means according to claim 2, wherein said connection means includes an adjustment means for adjusting the strength of a signal transmitted and received between said communication means and a corresponding antenna in a shielded room. 3. The pseudo antenna system according to 3. 5. The communication means is a signal generator, and generates, as an interference wave, a radio wave different from a radio wave transmitted and received between one of the antennas inside the shielded room and the antennas inside the remaining shielded room. 2. The method according to claim 1, wherein
The pseudo antenna system according to any one of claims 1 to 4. 6. The pseudo antenna system according to claim 2, wherein the connection between the communication unit and the antenna inside the shield chamber by the connection unit is connected by a coaxial cable.