Miniaturized dual-mode filter based on HMSIW cavity and zero adjustment method

Abstract

The invention discloses a miniaturized dual-mode filter based on an HMSIW cavity and a zero point adjustment method. The dual-mode filter comprises the HMSIW rectangular cavity, metallized through hole perturbation, slot line perturbation, a feed microstrip, a trapezoidal adapter, a 50-ohm microstrip line, an input port and an output port. The area of the dual-mode filter is only half of that of atraditional SIW dual-mode filter, each HMSIW cavity can generate two transmission zero points with controllable positions, and highly flexible filtering response can be achieved.

Description

technical field [0001] The invention belongs to the field of microwave technology and relates to a miniaturized dual-mode filter, in particular to a miniaturized dual-mode filter based on an HMSIW cavity and a zero point adjustment method. Background technique [0002] Substrate-integrated waveguide (SIW) filters have been widely used in modern microwave and millimeter-wave wireless communication systems due to their low loss, low cost, low profile, easy processing and easy integration. However, compared with microstrip or coplanar waveguide (CPW) filters, SIW filters have a larger size problem. To solve this problem, a common method is to make full use of two or more resonance modes in the SIW cavity to construct a dual-mode or multi-mode SIW filter, thereby reducing the number of SIW cavities. Not only that, dual-mode or multi-mode SIW filters can also generate position-controllable transmission zeros to achieve flexible filter response, but because they use a full-mode S...

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Problems solved by technology

For example, the quarter-wavelength transmission line resonant mode (quasi-TEM mode) and the higher-order cavity resonant mode (TE 102 mode) can realize a QMSIW dual-mode filter, but this dual-mode resonator itself cannot generate a transmission zero point, and needs to design a complex source-load coupling structure at the input and output ends to generate a transmission zero point, and the position of the transmission zero point is difficult to effectively adjust

By etching the CPW resonator and the coplanar slot line resonator on the surface of the HMSIW cavity resonator, a hybrid three-mode filter can be realized by using three different resonance modes, but the structure of this filter is difficult to expand to higher order, resulting in limited application

Dual-mode filters can also be constructed using the two very high-order cavity resonant modes of a sector-shaped QMSIW resonator, but the size reduction of the filter is limited due to the use of very high-order cavity resonant modes

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