VHF signal efficient and stable communication circuit

Abstract

The invention provides a VHF signal efficient and stable communication circuit, which comprises a signal input port, a power amplification circuit, a low-pass filter circuit, a fixed coupling circuit, a transceiving switch circuit and an antenna which are successively connected, a signal receiving port and a control circuit. The fixed coupling circuit comprises a double-core wire fixed coupling module; the double-core wire fixed coupling module comprises a double-core cable WT1 and a double-core cable WT2; the low-pass filter circuit is connected with the transceiving switch circuit through a first cable of a double-core cable WT1 and a first cable of a double-core cable WT2 which are connected in sequence; and the second cable of the double-core cable WT1 and the second cable of the double-core cable WT2 are respectively connected with the control circuit through two band-pass filtering processing modules which are used for carrying out band-pass filtering on the coupling signals in different frequency bands. According to the communication circuit, the signal transmission speed can be increased, the energy consumption can be reduced, the fixed coupling detection accuracy can be improved, and the output stability can be improved.

Description

technical field [0001] The invention relates to the technical field of high-frequency communication, and more specifically relates to a high-efficiency and stable communication circuit for VHF signals. Background technique [0002] Very high frequency VHF (Very high frequency) refers to radio waves with a frequency band from 30MHz to 300MHz. The VHF communication circuit is used in the communication network of the aviation industry, which makes it convenient for the aircraft to establish mutual communication with the ground and between the aircraft during the flight. [0003] The existing VHF communication circuit generally includes: a signal input port, a power amplifier circuit, a filter circuit, a fixed coupling circuit, a transceiver switch circuit, an antenna, a signal receiving port and a control circuit. Among them, the power amplifier circuit is used for signal amplification; the filter circuit is used for band-pass filtering of the signal; the transceiver switch ci...

AI Technical Summary

Problems solved by technology

[0004] Since the filter circuit of the existing VHF communication circuit needs to finely filter the high-power signal of the transmission signal, it needs to consume a lot of energy, and at the same time will cause the transmission speed to slow down, which does not meet the high-speed communication requirements of some applications; but if If the filter circuit is simplified to solve this problem, there will be another problem: when the harmonic component is large, the coupling signal of the fixed coupling circuit is doped with high-energy harmonics, which seriously affects the accuracy of output power voltage detection degree, resulting in the VHF communication circuit unable to adjust the output signal stably

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