Harmonic inhibition coaxial chamber filter

Abstract

The invention discloses a harmonic inhibition coaxial chamber filter. The harmonic inhibition coaxial chamber filter comprises two mirror image symmetric coaxial resonant chambers, wherein a couplingresonant window is arranged between the two coaxial resonant chambers, the coaxial resonant chambers are internally provided with main resonance metal columns, primary harmonic auxiliary resonance metal columns, secondary harmonic auxiliary resonance metal columns and feed units, a top portion of the coaxial resonant chambers is equipped with a fine tuning metal screw in a coaxial relationship with the main resonance metal columns, the main resonance metal columns, the primary harmonic auxiliary resonance metal columns and the secondary harmonic auxiliary resonance metal columns are respectively perpendicularly mounted at a bottom portion of the coaxial resonant chambers, the main resonance metal columns and the coaxial resonant chambers are coaxially arranged, the feed units comprise input output ports and coupling feed metal columns, the input output ports are coaxial feed wires, a top portion of the coupling feed metal columns is connected with the top portion of the coaxial resonant chambers, a bottom portion of the coupling feed metal columns is connected with inner conductors of the coaxial feed wires. The harmonic inhibition coaxial chamber filter is advantaged in that in-band filtering characteristics and out-band primary harmonic and secondary harmonic inhibition characteristics can be excellently realized.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to a harmonic suppression coaxial cavity filter. Background technique [0002] In modern communication systems, microwave filters are essential devices at the transmitter and receiver. It separates the signal, selects the signal in the frequency band that the system wants, and suppresses the signal in the frequency band that the system does not want. The microwave resonant circuit is different from the lumped parameter circuit in that the periodicity of the microwave element makes the circuit generate higher harmonics at frequencies that are integer multiples of the fundamental frequency. These high-order modes will bring great trouble to the design, so the harmonic suppression of the filter has always received great attention. In the early days, the use of klystrons in the cavity to suppress harmonics was an important method. The general harmonic suppression meth...

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Problems solved by technology

[0004] In 2016, Efstraios Doumains published an article entitled "A Technique to Suppress Harmonic Outputs in Coaxial CavityFilters at the Excitation Port" on "IEEE MICROWAVE AND WIRELESS COMPONENTSLETTERS", using auxiliary harmonic components at the input and output terminals to adjust the auxiliary harmonics The resonant frequency of the element is the same as the triple frequency of the main resonator, and the auxiliary harmonic element is directly coupled to the excitation column, thereby suppressing the main resonator at 3f 0 Higher harmonics generated at , but cannot suppress harmonics at the 5th octave

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