JPS63236421A - Microwave branching filter - Google Patents

Abstract

PURPOSE:To instantaneously change the frequency of a channel to be used, by providing the serial body of a switch and a BPF between corresponding circulators of first and second circulator strings respectively, and performing the ON-control of only one switch. CONSTITUTION:The microwave of the channel (CH)3 inputted from an input terminal 17 is almost totally reflected by the switch 21 set at an OFF state via the circulator(CL)1, and inputted to the CL1 again. An output from the CL1 is supplied to the switch 22 set at an ON state via the CL2, and it passes through the switch, then, it is inputted to the BPF30. A signal passing through the BPF30 is inputted to the BPF31 via the CLs 10 and 11, however, since the BPF31 corresponds to the frequency of a CH5 and no influence is given on the frequency of the CH3, the input signal is almost totally reflected on the BPF31, then it is inputted to the CL11. The signal is introduced to the BPF32 of a CH7 via the CL12, but, similarly it is almost totally reflected, and is supplied to the CL12. The signal, after receiving total reflection by the switches 25-28 respectively, arrives at an output terminal 18.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a microwave demultiplexing device, and in particular to microwave demultiplexing equipment used in emergency relief microwave wireless communication devices, vortaple microwave wireless communication devices, etc. Regarding equipment.

Prior Art Conventionally, in this type of microwave demultiplexing device, in order to support all the channel frequencies scheduled to be used, bandpass filters that can correspond to each of the channel frequencies scheduled to be used are prepared in advance, Band-pass filters corresponding to the required channel frequency can be changed and used by changing the cable wiring connections, etc.

However, in the case of urgent communication, this method has the disadvantage that it takes time to change the channel frequency and reliability is reduced due to the manual change work, so it is not practical.

Purpose of the Invention Therefore, the present invention was made to eliminate the drawbacks of the conventional ones, and its purpose is to provide a microwave demultiplexing system that can reliably change the used channel frequency without requiring any time. The goal is to provide equipment.

Structure of the Invention The microwave demultiplexing device according to the present invention includes a first circulator row consisting of n circulators (n is an integer of 2 or more) connected in series with each other, and a first circulator row consisting of n circulators also connected in series with each other. a second circulator row, and further capable of selectively controlling either a signal through state or a signal reflection state between each of the corresponding pairs of circulators in the first and second circulator rows. A switching means and a bandpass filter corresponding to each frequency of the n channels to be used are connected in series, one end of each of the first and second circulator rows is used as an input terminal and an output terminal, respectively, and the It is characterized in that only one of the switching means is controlled to be in a signal-through state.

1 disaster 1 The present invention will be described in detail below using the drawings.

First, referring to FIG. 3, it is assumed that in this embodiment, an example of the arrangement of frequency channels to be used is as shown in FIG. That is, it is assumed that frequencies from channel 1 to channel 8, which are sequentially arranged at equal intervals from low frequency to high frequency, are scheduled to be used. The channels that affect the channel in use are only one frequency channel above and below the channel in use. For example, when channel 3 is used, the only channels that affect channel 3 are channels 2 and 4, and other channels do not affect channel 3 at all.

Under the frequency channel configuration to be used having such a relationship, an apparatus according to an embodiment of the present invention is obtained as shown in FIG. Between the input terminal 17 and the terminator 19,
Eight circulators 1 to 8 are connected in cascade to one another.
It consists of two circulator rows. Also, the terminator 20
Similarly, eight circulators 9 to 16 are cascade-connected to each other to form another circulator row between the output terminal 18 and the output terminal 18 .

The connection relationship of each circulator in this case will be explained with reference to FIG. 2. It is assumed that each of the circulators 1 to 16 has, for example, three boats, and signals are transmitted from the first boat to the second boat, and from the second boat to the third boat (in the direction of the arrow shown by the solid line). . Therefore, between adjacent circulators, the third port of the front circulator is connected to the first port of the rear circulator. The first port of the circulator 1 is connected to the input terminal 17, the third port of the circulator 8 is connected to the terminator 19, and the first port of the circulator 9 is connected to the terminator 20, and the third port of the circulator 8 is connected to the terminator 20,
The third ports of are connected to the output terminals 18, respectively.

As shown in the figure, a series connection circuit including a switch and a BPF (band pass filter) is inserted between each pair of corresponding circulators in both circulator rows. For example, between each second boat of circulators 1 and 9, a switch 21 and a BPF 29 corresponding to the frequency of channel 1 are connected in series, and between each second boat of circulators 2 and 10, a switch 21 is connected in series. 22 and the BPF 30 of channel 3 are connected in series. Moreover, between each second boat of circulators 3 and 11, switch 23 and BPF 31 of channel 5
However, between each second port of the circulators 4 and 12, the switch 24 and the BPF 32 of the channel 7 are inserted in series. That is, BPF29~corresponding to channel frequencies that do not affect each other.
32 are inserted adjacently.

The connection relationship between these switches and the BPF is such that switches 21 to 2 are closer to each second port of circulators 1 to 4.
4 are provided, respectively, and BPFs 29 to 32 are provided closer to the second boats of the circulators 9 to 12, respectively.

Additionally, channel 2 is connected between circulators 5 and 13.
BPF 33 and switch 25 of channel 4 are connected between circulators 6 and 14, and BPF 34 of channel 4 and switch 2 are connected between circulators 6 and 14.
6 are connected in series. BPF35 of channel 6 and switch 2 are connected between circulators 7 and 15.
The BPF 36 of channel 8 and the switch 28 are connected in series between the circulators 8 and 16, respectively. That is, BPFs 33 to 36 corresponding to channel frequencies that do not affect each other are inserted and arranged adjacent to each other.

The connection relationship between these switches and BPFs is that BPFs 33 to 36 are closer to the second ports of circulators 5 to 8.
are provided, respectively, and switches 25 to 28 are provided closer to each second boat of the circulators 13 to 16, respectively.

In such a configuration, a case will be described in which, for example, channel 3 is used. In this case, only switch 22 is turned on and all other switches are turned off. Here, the switches 21 to 28 are elements that have the function of passing through a signal in an on state and totally reflecting a signal in an off state, and for example, a shutter element or the like may be used as long as it is an element having such a function. It is something that can be done.

The microwave of channel 3 inputted from the input terminal 17 passes through the circulator 1 to the switch 21 in the off state.
The signal is supplied to the circulator 1, is substantially totally reflected by the switch 21, and is input to the circulator 1 again. The output from circulator 1 passes through circulator 2 to switch 22 in the on state.
is supplied to BPF and is passed through by this switch 22.
30. The signal passing through this BPF 30 is introduced into BPF 31 via circulator 10.11.
Since the BPF 31 corresponds to the frequency of channel 5 and has no effect on the frequency of channel 3, the BPF 31 substantially totally reflects this input signal and supplies it to the circulator 11. This signal is introduced into the BPF 32 of channel 7 via the circulator 12, but is also substantially totally reflected by this BPF 32 and then supplied to the circulator 12. This signal reaches the output terminal 18 after being totally reflected by the switches 25 to 28 which are in the OFF state.

The above operation is applied not only to the frequency of channel 3 but also to the frequencies of other channels, and only the switches connected corresponding to the BPF of the used channel are selectively selected. Of course, the same operation can be achieved by controlling the switch to be in the on state and controlling all other switches to be in the off state.

The above example is an example when used as a microwave demultiplexing device of a transmitter, but when used as a microwave demultiplexing device of a receiver, terminal 18 is used as an input terminal, and terminal 17 is used as an input terminal.
is set as the output terminal, and the signal transmission direction of each circulator is set as shown by the dotted arrow in FIG. 1.2.

FIG. 4 is a schematic block diagram of a microwave communication system using the microwave demultiplexer shown in FIG. 1. When communicating between the transmitting device 41 and the receiving device 45, the direction of the circulator shown in FIG.
2 is used on the transmitting side, and a demultiplexer 44 whose circulator direction is shown by the dotted line is used on the receiving side. Note that 43 is an antenna system.

In this case, by selecting a filter for a channel only by selectively turning on the corresponding switch, it becomes possible to freely change the channel frequency used.

In the above embodiments, the case where the number of channels to be used is n=8 has been described, but it is clear that any number of channels where n is 2 or more is applicable.

Effects of the Invention As described above, according to the present invention, when changing the operating frequency, the channel can be changed instantly by simply turning on one switching means (switch element or shutter element). be. Therefore, if used for emergency relief or as a branching device in a portable microwave wireless communication system, urgent channel changes can be made immediately and reliability can be improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a detailed view of the circulator in Fig. 1, Fig. 3 is a diagram showing an example of frequency arrangement of channels to be used in an embodiment of the present invention, Fig. 1 is a schematic block diagram of a communication system using the microwave demultiplexing device of the present invention. Explanation of symbols of main parts 1-18... Circulator 21-28... Switch 29-36... BPF 17... Input terminal 18...・Output terminal

Claims (1)

[Claims] A first circulator row consisting of n circulators (n is an integer of 2 or more) connected in cascade with each other, and a second circulator row consisting of n circulators also connected in cascade with each other, further comprising: A switching means that can selectively control either the signal through state or the signal reflection state between the corresponding pair of circulators in the first and second circulator rows, and a switching means for each frequency of the n channels to be used. bandpass filters corresponding to each are provided in series, one end of each of the first and second circulator rows is used as an input terminal and an output terminal, respectively, and only one of the switching means is controlled to be in a signal through state. A mask wavelength demultiplexing device characterized by: