Coaxial high-power low-pass filtering-impedance converter

Abstract

The present invention relates to a coaxial big-power low-pass filtering- impedance converter which is characterized in that: the device has a coaxial structure formed by the inner and outer conductorand the insulated supporting plate, and the inner and outer conductor and the medium between then form the high and low impedance transmitting line; the high and low impedance transmitting lines are arranged at intervals, and the an insulated supporting plate is positioned between the inner and outer conductor of the low impedance transmitting line; the adjacent conductors are connected by screws.The advantages of the present invention reside in: a wider working frequency band and a bandwidth>=30% are provided; the device has a performance of lowpass amplitude-frequency and the secondary or more harmonic wave can be restrained effectively in the system; the output lowpass wave of the transmitter can be saved by using the device in the present invention to replace the impedance convertor in the multiway synthesizer and the inserted consumption of the RF output system is reduced, thus, the output system of the transmitter RF is simplified and the cost is also reduced.

Description

technical field [0001] The invention relates to an impedance converter in the technical field of wireless communication, in particular to a coaxial high-power low-pass filter-impedance converter. Background technique [0002] Impedance converters are widely used in wireless communication transmission equipment and antennas, and are a key technology for designing high-power multi-channel RF synthesizers. Usually, impedance converters complete two different impedance Z L to Z H Transform (Z L <Z H ), impedance ratio r=Z H / Z L >1; in the transmitter n-way synthesizer (n is a positive integer), usually Z H = 50Ω, Z L =112.5 / n; the main function of the common impedance converter is impedance transformation, even if it has low-pass amplitude-frequency characteristics, but its stop-band characteristics are poor, so it is usually necessary to use a low-pass filter in the transmitter. Contents of the invention [0003] The purpose of the present invention is to provid...

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Problems solved by technology

[0002] Impedance converters are widely used in wireless communication transmission equipment and antennas, and are a key technology for designing high-power multi-channel RF synthesizers. Usually, impedance converters complete two different impedance Z L to Z H Transform (Z L H ), impedance ratio r=Z H / Z L >1; in the transmitter n-way synthesizer (n is a positive integer), usually Z H = 50Ω, Z L =112.5 / n; the main function of the common impedance converter is impedance transformation, even if it has low-pass amplitude-frequency characteristics, but its stop-band characteristics are poor, so it is usually necessary to use a low-pass filter in the transmitter

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