Radio frequency front-end standing wave protection circuit

Abstract

The invention discloses a radio frequency frontend standing wave protection circuit which comprises a switch, a small signal load end and a radio frequency output link. The switch is a single-pole double-throw switch, the single end of the switch is a radio frequency signal input end, one end of the double-throw end corresponds to the radio frequency output link end, the other end of the double-throw end corresponds to the small signal load end, the switch is thrown to the radio frequency output link end under the normal working condition of the radio frequency output link, and input small signals are radiated out through the radio frequency output link; the switch is thrown to a load end, outputs small signals in a heat dissipation mode, and protects the radio frequency front-end module.The switch is introduced into the input end of the radio frequency front-end module, signal input can be completely cut off under the condition of open circuit or large standing wave, and high heat consumption of the isolator load end caused by long-time open circuit is avoided.

Description

technical field [0001] The invention belongs to the technical field of designing a radio frequency front-end standing wave protection circuit based on a missile-borne data link communication link, and relates to a radio frequency front-end standing wave protection circuit to effectively protect a transmitter, avoid damage caused by open circuit work, and has a fast response speed and can Effectively reduce costs. Background technique [0002] In the data link wireless communication link, the RF front-end module is essential. In the high-power working mode, if the connection to the antenna is not tight or not connected, the antenna port and the load of the isolator will be burned for a long time, and even the RF front-end module may be burned. In order to avoid this problem, the RF front-end module has various standing wave protection circuit methods, and the common ones are as follows: [0003] 1. Relying on the load end of the isolator to absorb power and convert it into ...

AI Technical Summary

Problems solved by technology

[0003] 1. Relying on the load end of the isolator to absorb power and convert it into heat loss, powering on for a long time will easily cause the temperature of the module to rise rapidly. When the temperature rises to a certain level, the electrical performance of the module will be damaged;

[0004] 2. Rely on the standing wave alarm method, that is, add a coupler between the RF front-end module and the antenna. Once the circuit is opened, a high level will be reported, and the operator will be informed by a red light alarm or uploaded to the FPGA. Here There is a risk

The risk of this method is that the RF front-end module is continuously turned on and off. Although the average power is low, there will still be a lot of heat gradually dissipated.

Images