A microwave single-pole double-throw switch that adopts common terminal feeding and does not need separate control and power-up

Abstract

The invention discloses a microwave single-pole double-throw switch having a function of common feed and requiring no independent control or powering up. The switch comprises a common RFin, a first gate branch and a second gate branch. One end of the first gate branch comprises a first microstrip line L1, a second microstrip line L2 and a first PIN diode VD1. One end of the first microstrip line L1 is connected with the common RFin, and the other end of the first microstrip line L1 is connected with an RFout1. One end of the second microstrip line L2 is parallelly connected between the first microstrip line L1 and the RFout1, and the other end of the second microstrip line L2 is connected with an anode of the first PIN diode VD1. A cathode of the first PIN diode VD1 is grounded. The second gate branch comprises a third microstrip line L3 and a second PIN diode VD2. One end of the third microstrip line L3 is connected with the RFin, and the other end of the third microstrip line L3 is connected with an RFout2. An anode of the second PIN diode VD2 is parallelly connected between the third microstrip line L3 and the RFout2. A cathode of the second PIN diode VD2 is grounded. The common feed mode allows a function of switch gating to be achieved through radio frequency cable feeding, with no need for independent control and powering up; the microwave single-pole double-throw switch is applicable to places inconvenient for control and powering up, such as the tops of base stations and the tops of towers.

Description

technical field [0001] The invention relates to a radio frequency switch, in particular to a microwave single-pole double-throw switch which adopts common end feeding and does not need separate control and power supply. Background technique [0002] Microwave electronic switches are commonly used devices in microwave communication systems, and are used to control the channel switching of microwave signals. It includes a common port and multiple independent ports, and generally requires independent power supply and control ports. Microwave electronic switches are usually realized by different combinations of PIN diodes. Traditional microwave single-pole double-throw switches are mainly divided into three types: series, parallel, and series-parallel. [0003] The circuit schematic diagram of the traditional series single-pole double-throw switch is as follows: figure 1 As shown, when control 1 applies positive current and control 2 applies negative voltage, PIN diode VD1 is ...

AI Technical Summary

Problems solved by technology

The disadvantage of the traditional parallel SPDT switch is that the RF channel is affected by 1 / 4λ, and the working bandwidth is very narrow. As the frequency increases, the insertion loss gradually increases. At the working center frequency, the isolation is the largest; off-center The farther the frequency, the lower the isolation

[0005] The traditional series, parallel, and series-parallel SPDT switches are only suitable for PCB boards, chassis, cabinets, etc., which are convenient for connection and control, and have power supply systems.

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