JPS6242420B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a microwave band, which has a working circuit and a backup circuit, and whose transmission circuits are switched by a high frequency switch.
The present invention relates to a millimeter wave band wireless communication device.

Conventional microwave band and millimeter wave band wireless communication devices having active and backup systems use high frequency switching devices such as diode switches to switch between active and backup modes in their transmission circuits.

FIG. 1 is a block diagram showing its configuration. The signal input to terminal 1 is divided into working channel 3 and backup channel 4 by hybrid 2.
By controlling the high frequency switchers 5 and 6 used at the output section of each channel, the active and spare channels are selected, and then the signal is sent out from the antenna 7 through the circulator.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication device in which a working/standby switching section of a transmitting circuit can be made inexpensive and compact.

In order to achieve the above object, the active protection wireless communication device according to the present invention has a working channel into which one of the transmission signals branched by hybrid is input, and a protection channel into which the other transmission signal is input. In a working standby wireless communication device in which the working standby is selected by a high frequency switch, a voltage is externally applied to a bias circuit of a frequency multiplication diode of a frequency multiplier used in a transmitting circuit of each channel, and By changing the operating point, the frequency multiplier is given operation as a switch, and the frequency multiplier and the high frequency switch are configured to switch between the active and standby modes.

According to the above configuration, the amount of attenuation required for the high frequency switch can be reduced, and the number of stages of switches can also be reduced, making it possible to completely achieve the object of the present invention.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIGS. 2 and 3 are block diagrams showing an embodiment of a working standby wireless communication device according to the present invention.

In Figure 2, after the signal input to terminal 1 is branched into a working channel and a protection channel by hybrid 2, it is modulated by modulators 8 and 9 of each channel, and the output is directly converted to the transmission frequency by frequency multipliers 10 and 11. This is a direct modulation method that multiplies.

FIG. 3 shows an up-converter system in which the outputs of modulators 8 and 9, which modulate branched input signals, are converted into transmission frequency waves by transmission mixers 12 and 13. In each embodiment, frequency multipliers 10 and 11 or local oscillator 1
Frequency multiplier 16,1 used after 4,15
7 and high frequency switchers 5 and 6 perform switching between active and standby.

FIG. 4 is a diagram showing an example of a frequency multiplier used in the present invention. This example includes an input matching circuit 18, a frequency multiplication diode 19, and an output bandpass filter 2.
0 and a bias circuit 21. The bias circuit 21 is connected to the anode of the diode 19, and its bias voltage value is set so that the output of the multiplier is maximized. An external power source is also applied, and the bias voltage value can be switched from the above-mentioned optimum bias voltage value to a bias voltage value that provides the required amount of attenuation. This switching allows the output of the multiplier to be turned on and off.

Figures 5 and 6 are diagrams showing specific examples of the bias circuit described above. In Figure 5, a DC power supply 25 is connected to the bias circuit which is taken out of the case of the multiplier by a feedthrough capacitor 24 between resistors 22 and 23. This is an example. The multiplier can be turned on and off by changing the voltage value of this DC power supply. In addition, Fig. 6 shows a so-called self-bias method, in which the optimum bias voltage value is set by resistors 22 and 23 when on, and when off,
This is an example in which the bias voltage is set to obtain the required amount of attenuation from the DC power supply. On/off switching is performed by a switch 26.

As explained in detail above, the present invention provides a frequency multiplier and a high frequency switching device capable of switching on and off the working and standby transmission circuits of microwave band and millimeter wave band wireless communication devices having working and standby systems. Since this is done in combination with a high frequency switch, the attenuation required for the high frequency switch can be reduced, and the number of stages of switches can also be reduced, making it possible to create a cheaper, smaller and simpler switching section.

[Brief explanation of the drawing]

FIG. 1 is a transmission circuit diagram of a conventional active and backup wireless communication device, FIGS. 2 and 3 are transmission circuit diagrams of a current and backup wireless communication device according to the present invention, and FIG. 2 is an embodiment of a direct modulation method. FIG. 3 shows an embodiment of the up converter method. FIG. 4 is a block diagram of the frequency multiplier, and FIGS. 5 and 6 are circuit diagrams of the bias circuit of the frequency multiplier used in the present invention. 2...Hybrid, 5,6...High frequency switcher, 7...Antenna, 8,9...Modulator, 10,
11, 16, 17...Frequency multiplier, 12, 13
...Transmission mixer, 14, 15...Local oscillator, 1
8...Input matching circuit, 19...Frequency multiplication diode, 20...Output bandpass filter, 21...
...Bias circuit, 22, 23...Resistor, 24...
Feedthrough capacitor, 25...DC power supply, 26...switch.

Claims (1)

[Claims] 1 A working standby radio having a working channel into which one of the transmission signals branched by the hybrid is input and a protection channel into which the other of the transmission signals is input, and in which the working standby is selected by a high frequency switch. In the communication device, a voltage is externally applied to the bias circuit of the frequency multiplication diode of the frequency multiplier used in the transmission circuit of each channel to change the operating point of the diode, thereby causing the frequency multiplier to act as a switch. What is claimed is: 1. A working-standby wireless communication device, characterized in that the working-standby wireless communication device performs the working-standby operation, and the working-standby switching is performed by the frequency multiplier and the high-frequency switch.