JPH02170729A - Radio receiver - Google Patents

Abstract

PURPOSE:To attain the parallel operation of an auxiliary receiver in a normal operating condition hardly decreasing the input level of a high frequency signal to a current receiver by allowing a leaking circuit provided on a high frequency switch to leak a part of the high frequency signal selected by means of a switching element, and supplying it to a nonselective side receiver. CONSTITUTION:A high frequency switch 1 includes a switching element 13 and leaking circuits 14 and 14'. The switching element 13 switches and outputs a high frequency signal 6 inputted from an input terminal to either one of output terminals 12 and 12'. Further, the leaking circuits 14 and 14', which are respectively inserted between the input terminal 11 and the output terminal 12, and the input terminal 11 and the output terminal 12', leak a part of a high frequency signal 6 selected by the switching element 13, and supply it to the nonselective side receiver. Thus, without losing the input signal to the current receiver 3, an auxiliary receiver 3' can be operated in parallel in the normal operating condition.

Description

[Detailed description of the invention] [Industrial application field] The present invention uses one of the two receivers as the current receiver.

Regarding a so-called working standby type radio receiving device in which the other side is operated in parallel with the other as a standby receiver, in particular a radio receiving device including a high frequency switch that switches a high frequency signal from an antenna to either the working receiver or the standby receiver. Regarding equipment.

[Conventional technology]

Conventionally, this type of radio receiving apparatus has had a configuration as shown in FIG. That is, the high frequency signal 6 input from the antenna 2 is switched by the switching element 13 in the high frequency switch 1'', and is sent to the active receiver (RX) 3 or the backup receiver (RX) 3.
RX) 3° (usually the working receiver 3; in case of failure, the backup receiver 3'), and is converted into a baseband signal in the receiving receiver. A baseband switch (SW) 5 selects a signal from an operating receiver and sends it as a baseband signal 7 to the next device.

Further, as another conventional example, a wireless receiving device having the configuration shown in FIG. 4 is also known. In this system, a hybrid (H) 4 is used in place of the high frequency switch l'' shown in FIG. 3, and a high frequency signal of the same level is distributed to each of the working receiver 3 and the standby receiver 3''.

[Problem to be solved by the invention]

As mentioned above, in the conventional radio receiving apparatus, the high frequency switch 1° or the hybrid 4 including the switching element 13 is used to supply a high frequency signal to the receiver.

By the way, in the radio receiving device shown in Fig. 3, when two receivers 3 and 3° are operated in parallel to prevent failures, the high frequency switch 1° normally sends the high frequency signal 6 to only the currently used receiver 3. If a failure occurs in the receiver 3, the high frequency switch l will be turned on.

As a result, the high frequency signal 6 is supplied only to the spare receiver 3°. In this case, since the high-frequency signal 6 is not input to the backup receiver 3 at normal times, it cannot immediately operate normally even if it is switched to its own receiver, and it takes a long time to rise until it can operate normally. This means that the actual changeover will be delayed. In addition, preliminary reception [3
It is not possible to know whether or not `` is broken or not, making maintenance etc. difficult.

On the other hand, in a wireless receiving apparatus using the hybrid 4 as shown in FIG. 4, the drawbacks of the wireless receiving apparatus shown in FIG. 3 are eliminated. However, since the high frequency signal 6 from the antenna 2 is distributed to the same level by the hybrid 4, when the current receiver 3 is normally used, the current receiver 3 is The input level of the high frequency signal is approximately 3
This results in a dB drop, and a receiver with a small noise figure cannot take advantage of its performance, which is disadvantageous in terms of the system gain of the device.

The present invention solves these conventional problems, and its purpose is to operate a backup receiver in parallel in normal operation without substantially reducing the input level of high-frequency signals to the current receiver. The object of the present invention is to provide a wireless receiving device that can perform wireless communication.

[Means to solve the problem]

In order to achieve the above object, the present invention has two receivers operated in parallel, one for active use and the other for backup, and selectively supplies a high frequency signal from an antenna to one of the two receivers. and a high-frequency switch including a switching element, the high-frequency switch includes a leakage circuit that leaks a part of the high-frequency signal selected by the switching element and supplies it to a non-selected receiver. There is.

[Function] In the radio receiving device of the present invention, one of the two receivers is operated in parallel, one in use and the other as a backup, and the switching element in the high frequency switch switches the high frequency signal from the antenna to the two receivers. At the same time, a leakage circuit provided in the high frequency switch leaks a part of the high frequency signal selected by the switching element and supplies it to the receiver on the non-selected side.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of a radio receiving device of the present invention. In the figure, the high frequency signal 6 from the antenna 2 is
The signal is manually input to the high frequency switch 1 and supplied to the working receiver 3 or the backup receiver 3° via the high frequency switch 1. The output of the receiver 33″ is the baseband switch 5
The output of one of the receivers is sent as a baseband signal 7 to the next device.

Here, the high frequency switch 1 includes a switching element 13 and a leakage circuit 14.14°. The switching element 13 switches the high frequency signal 6 inputted from the input terminal 11 to either the output terminal 12 or the output terminal 12° and outputs it, and is composed of a coaxial relay or the like. Also, between the input terminal 11 and the output terminal 12, the input terminal 11 and the output terminal 1
The leakage circuits 14 and 14° inserted between the
A part of the high frequency signal 6 selected by the switching element 13 is leaked and supplied to the receiver on the non-selected side, and is composed of, for example, a capacitor with a small capacitance.

For example, when inputting a high frequency signal in the 800MHz band,
If a capacitor of about 0.5 to 1 pF is used, about 10 d
The leakage of B is obtained. Furthermore, the loss of high-frequency signals to the working side due to leakage to the backup side in this way is 0.
This is about 5 dB, which is sufficiently smaller than when distributed by hybrid.

Since this embodiment has the above-described configuration, the backup receiver 3 can be used without affecting the active receiver 3.
° can be operated in parallel with an input current that is approximately 10 dB lower than on the current side.

FIG. 2 shows another example of the configuration of the high frequency switch 1, in which a PIN diode is used as the switching element 13 of FIG. In the high frequency switch 1 of this example, the bias current is passed from the bias terminal 18 to the PIN diode 16 . resistance 1
7. By flowing through the path of the bias terminal 1B', the input terminal 11 and the output terminal 12 are brought into high frequency conduction, and a part of the high frequency signal is transmitted to the output terminal 12 through the leakage circuit 14.14'.
leak to °. Conversely, by flowing a bias current from the bias terminal 18' through the path of the PIN diode 16°, the resistor 17°, and the bias terminal 1, the input terminal 11 and the output terminal 12° are brought into high-frequency conduction, and the high-frequency signal is A portion leaks to the output terminal 12 by the leakage circuit 14, 14'.

In addition, in FIG. 2, 15 is a capacitor for cutting direct current.

〔Effect of the invention〕

As explained above, in the radio receiving device of the present invention, a high frequency switch including a switching element that selectively supplies a high frequency signal from an antenna to one of two receivers is configured to transmit a high frequency signal selected by the switching element to the high frequency switch. A leakage circuit is provided that leaks part of the signal and supplies it to the non-selected receiver, so there is almost no loss of the input signal to the current receiver.
Spare receivers can be operated in parallel in the presence of input signals, ie, in normal operating conditions. Therefore, even when switching occurs when the active receiver fails, switching is performed while the backup receiver is operating normally, so the startup time of the backup receiver is Quick switching is possible without the need for

Furthermore, it is possible to know at all times whether or not the spare receiver is out of order, making maintenance work easier. Furthermore, since the input signal level to the current receiver hardly decreases, the problems of the conventional radio receiver shown in FIG. 4 are also solved.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram showing another configuration example of the high frequency switch 1, and FIGS. 3 and 4 are configuration diagrams of a conventional radio receiving device. In the figure, 1.1''...High frequency switch 2...Antenna 3.3''...Receiver (RX) 4...Hybrid (H) 5...Baseband switch (SW) 6... - High frequency signal 7... Baseband signal 11... Input terminal 12.12°... Output terminal 13... Switching element 14.14°... Leakage circuit 15... Capacitor 1616 for DC cut °...PIN diode 17 17°...Resistance 18.18'...Bias terminal 13: Switching element 14.14'; Leakage circuit Actual example of the original date and time Figure 1 Takaoka-wave switch Another structure of 1. Figure 2

Claims (1)

[Scope of Claims] A high-frequency receiver including two receivers, one of which is operated in parallel, one for active use and the other for backup, and a switching element that selectively supplies a high-frequency signal from an antenna to one of the two receivers. A radio receiving device having a switch, characterized in that the high-frequency switch is equipped with a leakage circuit that leaks a part of the high-frequency signal selected by the switching element and supplies the leaked signal to a non-selected receiver. Receiving device.