Harmonic suppression band-pass filter and manufacturing method thereof

Abstract

The invention provides a harmonic suppression band-pass filter and a manufacturing method thereof. The harmonic suppression band-pass filter comprises a first circuit board, two single impedance resonators, an input micro-strip line and an output micro-strip line; the input micro-strip line and the output micro-strip line are arranged on the upper surface of the first circuit board; the two single impedance resonators are arranged on the lower surface of the first circuit board; the input micro-strip line and the output micro-strip line and the two single impedance resonators are orthogonally coupled in predetermined points of the corresponding single impedance resonators respectively; the two single impedance resonators are coupled mutually and grounded; the predetermined points are arranged at third harmonic voltage zero points of every single impedance resonator, so that the third harmonic cannot be motivated and accordingly the suppression function is achieved; the predetermined point positions are confirmed through an optimization formula. The harmonic suppression band-pass filter has the advantages of being high in design accuracy, simple in structure, simple in design method and benefited to production.

Description

technical field [0001] The invention relates to the field of communication filtering, in particular to a harmonic suppression band-pass filter and a manufacturing method. Background technique [0002] With the rapid development of wireless communication systems, distributed wide stopband bandpass filters have been rapidly developed and applied because of their good integrability. However, the distributed wide stopband bandpass filter is affected by the harmonic response due to the periodic variation of the transmission line. Harmonic response not only reduces the rejection level and stopband width of wide stopband bandpass filter, but also affects the symmetry of passband. [0003] At present, a variety of design methods of wide stopband bandpass filters with wide stopband function have been studied, for example, 1. Optimization of the internal coupling of the resonator, such as: optimization of the coupling between resonators makes the odd and even mode of the coupled line...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of low precision, complex design process and inconvenient production of the harmonic suppression bandpass filter in the prior art, a resonator based on single impedance is provided, which has high precision, is convenient for design and production, and has a simple structure Harmonic suppression bandpass filter and manufacturing method thereof

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