JP2000013245A - Microwave transmitter - Google Patents

Abstract

(57) [Problem] To provide a microwave transmission device capable of amplifying signals having different frequencies by respective transmitters and transmitting the amplified signals from respective antennas, and performing redundant switching for antenna failure. I do. SOLUTION: A frequency synthesizer 2a () that combines signals from a plurality of input ports 3a, 5a (3b, 5b) and outputs from an output port 4a (4b) to each output side of a transmitter 1a (1b). 2b) and the frequency synthesizer 2a (2
b) a switch 6a (6b) connected to the output port 4a (4b), and the switch 6a (6b)
Is output to the antenna 7a of the transmitter 1a (1b).
(7b), and the other output is used as an input port of the frequency synthesizer 2b (2a) connected to the other transmitter 1b (1a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave transmitting apparatus having a plurality of transmitters for amplifying signals of different frequencies and a plurality of antennas, and more particularly, to a redundant apparatus for failure of an antenna or a transmitter. The present invention relates to a switchable microwave transmitter.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing the configuration of a conventional radio communication apparatus described in, for example, Japanese Utility Model Laid-Open Publication No. 4-43034, wherein 1a and 1b are transmitters, and 25c and 25d are transmitters 1a and 1d. The transmission couplers 23c and 23d distribute the respective outputs of the transmission couplers 1b.
Transmission hybrids 22a, 22 for vector-synthesizing the high power transmission output and the low power transmission output from 5c, 25d
b is a diplexer for distributing transmission / reception signals, 7a and 7b are transmission / reception antennas, 26a and 26b are reception couplers for distributing reception signals, and 27a and 27b are high-power reception outputs from the two reception couplers 26a and 26b. Hybrid for receiving and vector combining low power reception output, 24
a and 24b are receivers. Also, 61 is a first high power reception signal from the reception coupler 26a, 62 is a first low power reception signal from the reception coupler 26a, 63 is a second high power reception signal from the reception coupler 26b, 64 is a second low power reception signal from the reception coupler 26b;
5 is a first high power transmission signal from the transmission coupler 25c, 66 is a first low power transmission signal from the transmission coupler 25c, 67 is a second high power transmission signal from the transmission coupler 25d, and 68 is It is a second low power transmission signal from the transmission coupler 25d.

Next, the operation will be described. Antenna 7
Reference numerals a and 7b are mounted on a satellite main body (not shown) in directions opposite to the direction of the pointing axis. These antennas 7
a, 7b are received by the diplexers 22a,
At 22b, the transmission signals are isolated from each other and input to the reception couplers 26a and 26b. The first high-power reception signal 61 output from the high-level output side of the reception coupler 26a and the second low-power reception signal 64 output from the low-level output side of the reception coupler 26b are the reception hybrid 27a. A first low-power reception signal 62 that is vector-wise synthesized and output from the low-level output side of the reception coupler 26a and a second high-power reception signal 63 that is output from the high-level output side of the reception coupler 26b Are vector-wise synthesized by the receiving hybrid 27b. Outputs from the receiving hybrids 27a and 27b are input to two redundantly configured receivers 24a and 24b, respectively.
Transmission signals output from the two redundantly configured transmitters 1a and 1b are respectively transmitted by transmission couplers 25c and 25d.
Is input to The first high-power transmission signal 65 output from the high-level output side of the transmission coupler 25c and the second low-power transmission signal 68 output from the low-level output side of the transmission coupler 25d are transmitted by the transmission hybrid 23c. A first low-power transmission signal 66 that is vector-combined and output from the low-level output side of the transmission coupler 25c and a second high-power transmission signal 67 that is output from the high-level output side of the transmission coupler 25d Are vector-wise synthesized by the transmission hybrid 23d, and the diplexers 22a and 22
The signal is output to the two antennas 7a and 7b via b.

[0004]

Since the conventional wireless communication apparatus is configured as described above, two receivers 24 are provided.
a, 24b and two transmitters 1b are connected to two antennas 7
a and 7b are provided with a power difference between them and cross-connected to supply power, thereby maintaining the redundancy.
There is a feature that the radiation patterns of a and 7b are different, and transmission and reception can be performed using the combined radiation pattern. However, since the two antennas 7a and 7b have different radiation patterns, there is a problem that if one antenna fails, the other antenna cannot back up completely. Further, the above-described conventional wireless communication device does not disclose a case where signals of different frequencies are transmitted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to amplify signals having different frequencies in respective transmitters and transmit the amplified signals from respective antennas, and to perform redundant switching for failure of an antenna or the like. It is an object of the present invention to provide a microwave transmission device capable of performing the following.

[0006]

According to a first aspect of the present invention, there is provided a microwave transmitting apparatus for synthesizing signals from a plurality of input ports on each output side of a plurality of transmitters for amplifying signals of different frequencies. And a frequency synthesizer that outputs the output signal from the output port, and a frequency synthesizer connected to the output port of the frequency synthesizer, one output serving as the antenna of the transmitter and the other output serving as the antenna of the other transmitter. And a changeover switch serving as an input port.

[0007] A microwave transmitting apparatus according to a second aspect of the present invention is such that each antenna is directed to a different receiving station.

According to a third aspect of the present invention, there is provided a microwave transmitting apparatus, wherein a frequency synthesizer and a changeover switch are provided on an input side of a transmitter, one output of the changeover switch is used as the transmitter, and the other is used as the transmitter. Is used as an input port of a frequency synthesizer connected to another transmitter.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a microwave transmitting apparatus according to Embodiment 1 of the present invention, where 1a and 1b are transmitters, and 2a and 2b are transmitters 1
The frequency synthesizers 3a, 3b, 4a, 4b and 5a, 5b connected to the respective output sides of the frequency synthesizers 2a, 2b include a first input port, an output port, and 2 shows a second input port. Reference numerals 6a and 6b denote changeover switches connected to the respective output ports 4a and 4b of the frequency synthesizers 2a and 2b. One output of the changeover switches 6a and 6b is connected to the antennas 7a and 7b, and the other is connected to the other. The output is the second input port (4b, 4) of the frequency synthesizer (2b, 2a) of another route.
a). Reference numeral 8 denotes a receiving station that receives transmission signals emitted from the two antennas 7a and 7b of the microwave transmission device.

Next, the operation of the microwave transmitting apparatus having the above configuration will be described. In normal operation, a first signal (frequency f1) and a second signal (frequency f2) having different frequencies are transmitted from different transmitters (1a, 1).
b) and amplified to an appropriate level, and then the frequency synthesizers (2a, 2b) and the changeover switch (6), respectively.
a, 6b) and transmitted to the same receiving station 8 from the antennas (7a, 7b). The receiving station 8 is, for example, a satellite. The receiving station 8 receives a signal transmitted from a microwave transmitting apparatus, performs frequency conversion, amplification, and the like, and distributes the signal to a ground station. Since this function is out of the scope of the present invention, its details are omitted. In such a communication system, for example, when one of the antennas 7a fails, the microwave transmission device changes the route of the first signal by switching the changeover switch 6a. That is, the first signal output from the output port 4a of the frequency synthesizer 2a is input to the second input port 5b of the frequency synthesizer 2b, where the first signal and the second signal are synthesized. ,
The signal is output from the output port 4b of the frequency synthesizer 2b, and transmitted from the antenna 7b to the receiving station 8 via the changeover switch 6b. Also, when the other antenna 7b breaks down,
Similarly, by switching the changeover switch 6b, the second signal can be transmitted from the antenna 7a to the receiving station 8 together with the first signal.

FIG. 2 shows an example of the configuration of the frequency synthesizer 2a. 9p and 9q are band-pass filters (hereinafter referred to as BPFs), 10p and 10q are 3 dB distributors,
11 is a dummy terminal. Each of the BPFs 9p and 9q is a BPF having the same performance with the input signal frequency from the first input port 3a as a pass band and the input signal frequency from the second input port 5a as a reflection band.
By connecting 3 dB distributors 10p and 10q of a type having a phase difference of 90 degrees between both distribution ports to both ends of p and 9q, an input signal from the first input port 3a and
The input signal from the second input port 5a can be combined and output together from the output port 4a. The configuration of the frequency synthesizer 2b is the same as that of the frequency synthesizer 2a.
The configuration is exactly the same.

Embodiment 2 FIG. In the first embodiment, the case where the input signal has two inputs has been described.
Even in the case of input or more, by using the same configuration as in the first embodiment for each transmitter, it is possible to perform redundant switching for an antenna failure. FIG. 3 shows an example in which three input signals are used. The frequency synthesizers 2a, 2b, and 2c have two input ports and can output two signals input from the input ports together from the output ports. And a change-over switch 6a, 6b, 6c to switch the transmission route of a transmission signal when an antenna fails, so that a signal can be transmitted from another antenna. In this example, a frequency synthesizer 2c in which a route opposite to the antenna 7a side of the changeover switch 6a is arranged on a different signal path.
Antenna 7b of the changeover switch 6b
The route opposite to that on the input side is the input port 5a of the frequency synthesizer 2a.
By connecting the route opposite to the antenna 7c side of the changeover switch 6c to the input port 5b of the frequency synthesizer 2b, even if two of the three antennas fail, three signals are transmitted from the remaining one. To be able to. When the input signal is n-input (n> 4), FIG.
With the same configuration as described above, it is possible to perform redundancy switching for an antenna failure.

Embodiment 3 In the first and second embodiments, the case where each antenna is directed to the same receiving station and transmission is performed to the receiving station has been described. However, as illustrated in FIG. 4, each antenna is directed to a different receiving station. In a case where transmission is performed to a plurality of receiving stations 8a and 8b, redundancy switching can be performed for a failure of the receiving stations 8a and 8b.

Embodiment 4 In the first to third embodiments, the frequency synthesizer and the changeover switch are provided between the transmitter and the antenna. However, as shown in FIG. 5, they may be arranged on the input side of the transmitter. In this case, it is possible to perform redundancy switching not only for the antenna but also for the failure of the transmitter.

In the first and second embodiments, all antennas are directed to the same receiving station. In the third embodiment, all antennas are directed to different receiving stations. Are not limited to these, but are determined as appropriate depending on the size of the microwave transmitting device, the type of receiving station, and the like.

[0017]

As described above, according to the first aspect of the present invention, a frequency synthesizer and a changeover switch are provided between a plurality of transmitters for amplifying different signals and an antenna for transmitting each signal. The antenna is configured so that the route that the signal normally goes to the individual antenna can be switched to the input port of the frequency synthesizer for a different signal, so that in the event of a failure of the antenna or the like, another antenna can be easily used as a backup. Therefore, the reliability of the microwave transmission device can be improved. Further, since there is no effect of performing the main switching on routes other than the route in which the failure has occurred, no instantaneous interruption or the like occurs during the switching.

According to the second aspect of the present invention, since each antenna is directed to a different receiving station, it is possible to perform redundant switching for a failure of the receiving station.

According to the third aspect of the present invention, the frequency synthesizer and the changeover switch are provided on the input side of the transmitter, one output of the changeover switch is used as the transmitter, and the other output is used as another transmitter. Since the input port of the frequency synthesizer connected to the transmitter is used, redundant switching can be performed not only for a failure of the antenna but also for a failure of the transmitter.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a microwave transmission device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a frequency synthesizer.

FIG. 3 is a diagram illustrating a configuration of a microwave transmission device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a microwave transmission device according to a third embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration of a microwave transmission device according to a fourth embodiment of the present invention.

FIG. 6 is a diagram illustrating a configuration of a conventional wireless communication device.

[Explanation of symbols]

1a, 1b, 1c transmitter, 2a, 2b, 2c frequency synthesizer, 3a, 3b, 3c first input port, 4a,
4b, 4c output port, 5a, 5b, 5c second input port, 6a, 6b, 6c switch, 7a, 7
b, 7c antenna, 8, 8a, 8b receiving station, 9p,
9q bandpass filter, 10p, 10q 3dB divider, 11 dummy terminator.

Claims (3)

[Claims] 1. A microwave transmitter comprising a plurality of transmitters for amplifying signals of different frequencies, and a plurality of antennas corresponding to the respective transmitters, wherein each of the transmitters has an output side, A frequency synthesizer that combines signals from a plurality of input ports and outputs the output from an output port; and an output port of the frequency synthesizer, wherein one output is used as an antenna of the transmitter and the other output is used for another transmission. And a changeover switch serving as an input port of a frequency synthesizer connected to the apparatus. 2. The microwave transmitting apparatus according to claim 1, wherein each of the antennas is directed to a different receiving station. 3. A frequency synthesizer in which the frequency synthesizer and the changeover switch are provided on the input side of a transmitter, one output of the changeover switch is used as the transmitter, and the other output is connected to another transmitter. 2. The microwave transmitting apparatus according to claim 1, wherein the input port is an input port.