Miniaturized substrate integrated waveguide filter and high-order filter thereof

Abstract

The invention discloses a miniaturized substrate integrated waveguide filter comprising a substrate and a microstrip line structure connected to the substrate as an input and an output separately, wherein the lower surface of the substrate is clad with copper; a slotted structure is etched on the upper surface of the substrate and is rotationally symmetric about the center of the substrate; and two open resonators are disposed on the upper surface of the substrate. In addition, the present invention also discloses a high-order filter based on the miniaturized substrate integrated waveguide filter. A high-order resonator is arranged between the two open resonators in order to improve the rectangularity of the filter and improve the frequency selection performance of the filter. The S-shapedslotted structure is etched on the surface of the substrate so as to achieve two equivalent short-circuited quarter-wave resonators to form a second-order band-pass filter, thereby miniaturizing thefilter.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a miniaturized substrate integrated waveguide filter and a high-order filter thereof. Background technique [0002] The bandpass filter with low insertion loss and high Q value is the basic part of modern wireless communication system. It can suppress clutter and other interference signals, and let the useful signal pass through with low loss. It is one of the key components of the RF front-end circuit. Since the Substrate Integrated Waveguide (SIW) filter has the advantages of high power capacity, low insertion loss, and easy integration, it has been widely researched and applied, and SIW filters with various functions and types have been applied to in various communication systems. As far as modern communication systems are concerned, the pursuit of system miniaturization and convenience is also a very important indicator. Realizing the miniaturization of the s...

AI Technical Summary

Problems solved by technology

[0005] The filter design using microstrip line and strip line has the advantages of small size, easy integration, and high degree of design freedom; but its disadvantage is that the power capacity is small and the loss is large, especially at the millimeter wave frequency. The radiation loss is serious

The filter design based on the waveguide structure, although it has the largest power capacity and very small insertion loss, its disadvantage is that the volume is too large, the three-dimensional structure of the filter is difficult to integrate with the PCB circuit, and the practicability is not strong.

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