High-frequency short-wave high-suppression communication circuit

Abstract

The invention provides a high-frequency short-wave high-suppression communication circuit, which comprises a signal input port, a power amplification circuit, a low-pass filter circuit, a transceiving switch circuit, a fixed coupling circuit, an antenna, a signal receiving port and a control port, which are connected in sequence; the power amplification circuit comprises a first-stage power amplification circuit, a second-stage power amplification circuit, a third-stage power amplification circuit and a grid voltage switch driving circuit; the fixed coupling circuit comprises a double-core wire fixed coupling module and a leveling correction module; the double-core wire fixed coupling module comprises a double-core cable WT6 and a double-core cable WT7; the leveling correction module comprises an LC series unit and an LC parallel unit; and the auxiliary cable input ends of the double-core cable WT6 and the double-core cable WT7 are respectively grounded through the LC series unit and the LC parallel unit. The communication circuit can realize the transmitting and receiving functions of high-frequency short-wave signals, output harmonic waves are reduced by optimizing the coupling flatness, the technical effect of high suppression is achieved, and the operation stability and reliability are improved.

Description

technical field [0001] The present invention relates to the technical field of high-frequency communication, and more specifically, relates to a high-frequency short-wave high-rejection communication circuit. Background technique [0002] The operating frequency of the high-frequency communication circuit is generally 2-30MHz, which is used for long-distance communication between the aircraft and the ground or between the aircraft and other aircraft. It is the main means of communication in high-latitude areas and long-distance communication. High-frequency communication circuits usually include power amplifier circuits, filter circuits, fixed coupling circuits, etc. [0003] In order to meet the gain requirements of the high-frequency communication circuit, the power amplifier circuit can adopt a multi-stage amplifier structure, and output the adjustment parameters of each stage of amplifier through the control device to achieve accurate and stable power amplifier effect. ...

AI Technical Summary

Problems solved by technology

However, the performance of the existing fixed coupling circuit is not ideal. The fixed coupling circuit composed of two-core cables is generally used for narrowband; the coupling flatness is poor in multi-frequency applications; when the standing wave performance of the ultrashort wave antenna is poor, the output power Large fluctuations are not conducive to the stable operation of the power amplifier circuit, resulting in an increase in output harmonics, affecting the stability and reliability of the high-frequency communication circuit operation

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