JPH054642U - Output waveguide circuit for transmission - Google Patents

Abstract

(57) [Summary] [Construction] Working and standby power amplifiers 1A and 1B, circulators 2A and 2B connected to the outputs of the power amplifiers, respectively, and a changeover switch 3 for switching between working and spare at the output of the circulator. And a hybrid 6 connected to the dummy side opening of the changeover switch 3 and first and second coupling amounts of 3 dB connected to the two output sections of the hybrid, respectively.
Of the directional couplers 7A and 7B, and two input parts connected to the reflection port side of each of the two circulators, and two output parts connected to the first and second directional couplers. Dummy loads 5A to 5D are connected to the output portions of the directional coupler 7C and the first and second directional couplers, respectively. [Effect] Since the withstand power per dummy load used is one-fourth that of the conventional example, the fins for radiating heat of the dummy load can be made smaller, and in some cases the water cooling system can be eliminated. There is. Therefore, the dummy load can be made compact and lightweight, and the dummy load can be configured at a low price.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an output waveguide circuit for transmission, particularly in the microwave and quasi-millimeter wave band. In the output waveguide circuit of the current standby configuration, terminate the output of the power amplification section of the standby system. Also, a transmission output equipped with a dummy load that absorbs the reflected power from the antenna device side. Force waveguide circuit.

[0002]

[Prior art]

  Conventionally, this type of output waveguide circuit has been used as shown in FIG. Circulators 2A and 2B are provided on the output sides of the amplifiers 1A and 1B, respectively. A waveguide-type changeover switch 3 is provided on the output side of the vibrators 2A and 2B to provide a backup power line for use. One output of the force amplification units 1A and 1B is output to the antenna device side, and the other output is set to a dummy low output. Switched to side 4. The circulator on the output side of the power amplifiers 1A and 1B 2A and 2B improve the impedance when the antenna device side is seen from the power amplifier. It is used to connect the dummy loads 4A and 4B to the antenna side. The unnecessary reflected wave from is terminated so that the reflected wave does not enter the power amplifier side. .

[0003]

[Problems to be solved by the device]

  In the above-mentioned conventional output waveguide circuit for transmission, the maximum output power of the power amplifier is set to P The dummy load 4 connected to the changeover switch 3 has a power resistance of P More than that is needed. Also, it is connected to the circulators 2A and 2B. The withstand power of the dummy loads 4A and 4B is the output impedance as seen from the antenna device side. Is terminated for some reason and the output power becomes total reflection, the reflected wave is terminated. In order to achieve this, a power resistance of P watts or more is required. On the other hand, a dummy low for high power In some cases, large fins for heat dissipation are used, and there are cases where water cooling is used. There is also a problem that the structure for cooling becomes complicated, the shape and weight increase, and the cost becomes higher.

[0004]   The present invention reduces the size of the dummy load by reducing the transmission power. To provide an output waveguide circuit for transmission that can reduce weight and cost is there.

[0005]

[Means for Solving the Problems]

  The output waveguide circuit for transmission of the present invention includes a working and a standby power amplification unit and The circulators connected to the output of the amplifier and the working spare are In the output waveguide circuit for transmission, which has a changeover switch for changing over at the output part of the transmitter The hybrid connected to the dummy side opening of the selector switch, The first and second coupling amounts of 3 dB are respectively connected to the two outputs of the brid. A directional coupler and two inputs on the reflection port side of each of the two circulators. A force section is connected to the two output sections of each of the first and second directional couplers. Dami Road is connected to the output section.

[0006]

【Example】

  Next, the present invention will be described with reference to the drawings. FIG. 1 shows the structure of an embodiment of the present invention. It is a diagram and the same reference numerals as those of the conventional circuit of FIG. 2 have the same configuration and function. Sanawa The active power amplifiers 1A and 1B as spares and the circular circuits provided on the output side thereof. The alternators 2A and 2B and the changeover switch 3 are the same as the conventional ones. In this example, the circular The three directional couplers 7A, each having a coupling amount of 3 dB, are connected to the reflection ports of the rectifiers 2A, 2B. 7B and 7C are connected. The dummy load side of the changeover switch 3 has a hive. The lid 6 is connected to the output of which two directional couplers 7A and 7B are connected. It The four dummy loads 5A to 5D are respectively directional couplers 7A to 7D as shown in FIG. It is connected to 7C.

[0007]   Next, the operation of this embodiment will be described. Output power P watt of the power amplification unit 1B of the standby system Is bifurcated by the hybrid 6 and further passed through the directional couplers 7A and 7B. -Since it is supplied to the loads 5B and 5D, the dummy loads 5B and 5D have a 1 / 4P width. Power is evenly loaded. On the other hand, the output of the power amplifier 1A of the working system The power P watts passes through the circulator 2A and the changeover switch 3 and passes through the antenna device. Sent to the side. At this time, if the output impedance seen from the antenna device side is This causes the reflected power P watts to switch when the total power becomes worse at worst. Dummy load through switch 3 and circulator 2A and through directional coupler 7C It is supplied to 5A and 5C. The power supplied to the dummy loads 5A and 5C at this time is also Each is evenly loaded with 1/4 P watt. This is the spare system used The same is true for the case.

[0008]

[Effect of device]

  As described above, according to the present invention, the withstand power per dummy load used is dependent. Since it is 1/4 of the conventional example, the fins for heat dissipation of the dummy load can be made smaller. In some cases, there is the effect that the need for a water cooling system is eliminated. Therefore da Mea Road can be made compact and lightweight, and can be configured with a dummy load that is also inexpensive effective.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional transmission output waveguide circuit.

[Explanation of symbols]

1A, 1B power amplifier 2A, 2B circulator 3 changeover switch 4,4A, 4B, 5A-5D Dummy load 6 hybrid 7A-7C directional coupler

Claims (2)

[Scope of utility model registration request] 1. A transmission output waveguide circuit comprising a working and standby power amplification section, a circulator connected to an output of the power amplification section, and a changeover switch for switching between the working protection and the output section of the circulator. In, the hybrid connected to the dummy side opening of the changeover switch, the first and second directional couplers having a coupling amount of 3 dB respectively connected to the two output sections of the hybrid, and the two circulators. Two input parts are connected to the respective reflection port sides, and two output parts are connected to the output parts of the first and second directional couplers by a dami load, respectively. Wave tube circuit. 2. The transmission output waveguide circuit according to claim 1, wherein the dummy load has a withstand power that is a quarter of the output power of each of the power amplification units.