RF signal phase shifting network

Abstract

An RF signal phase shifting network comprises the components of a first phase shifter, a second phase shifter, a third phase shifter, a compensating phase-shifting circuit and a microstrip phase-shifting circuit; wherein the first phase shifter, the second phase shifter and the third phase shifter can perform phase shifting on an input signal; the first phase shifter, the second phase shifter and the third phase shifter respectively comprise a first port, a second port, a third port and a fourth port. According to the RF signal phase shifting network, the compensating phase-shifting circuit is used for compensating a phase difference which is caused by the microstrip phase-shifting circuit to multiple-frequency-point signal phase shifting; an error of the whole RF signal phase shifting network to multiple-frequency-point signal phase shifting can be reduced; and phase flatness is reduced, thereby satisfying requirements for multiple navigation systems and broadband applications in a circular polarized antenna.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a radio frequency signal phase-shifting network. Background technique [0002] Because circularly polarized antennas can receive incoming waves with any polarization and have the orthogonality of rotation, circularly polarized antennas have important applications in communications, radar, electronic countermeasures, and GPS. Circularly polarized antennas generally synthesize or decompose circularly polarized signals by a phase-shifting network, and the phase-shifting network is usually composed of a 90° bridge phase-shifting circuit and a 90° microstrip phase-shifting circuit. [0003] The 90° bridge phase shifting circuit can shift the phase by 90° with high precision in a wide frequency band. Generally speaking, within the range of 1200MHz-1600MHz, it can meet the requirement of phase shifting of 90±3°, and the phase flatness is 3°. The error is lower. The 90° microstri...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a radio frequency signal phase shifting network to solve the problem that the traditional phase shifting network has a large phase shifting error for multi-frequency signal. The radio frequency signal phase shifting network uses a compensation phase shifting circuit to compensate The error caused by the phase shifting of the multi-frequency point signal by the circuit is used to reduce the error caused by the phase shifting of the multi-frequency point signal by the radio frequency signal phase shifting network, thereby improving the axial ratio, gain and other indicators of the circularly polarized antenna

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