Novel compact single-band and dual-band bandpass filter based on one-third-mode substrate integrated waveguide

Abstract

In this paper, a novel structure of One-Third-Mode Substrate Integrated Waveguide Resonator (OTMSIWR) is first proposed, which reduces about 65% size. Based on the OTMSIWR, a single-band bandpass filter (BPF) operats at 4.55 GHz is designed. The single-band BPF has a wide and deep upper stopband. Further, a dual-band BPF using high mode technology based on the single-band filter is designed. The fundamental mode (TM 101 mode) and high mode (TM 201 mode) are utilized to achieve the dual-band response. The center frequencies locate at the 4.2 GHz and 6.15 GHz, respectively. Two transmission zeros (TZs) are achieved in the dual-band BPF by adjusting the positions of the feeds. To further improve the selectivity of the upper stopband of the dual-band BPF, two pairs of Complementary Split-Ring Resonators (CSRRs) are introduced on the surface of the OTMSIWR, which obtain the desired results. Finally, a singleband BPF and a dual-band BPF are fabricated and tested. The measured results agreed well with the simulated ones, which proved that the proposed structure is a good candidate to design filters.

Individually controllable dual-band bandpass filter with multiple transmission zeros and wide stopband

“…Dual-band bandpass filters (DB-BPFs) with controllable dual-passbands and wide stopband play an important role in low interference and multiservice wireless communication systems, and up to now, many design methods have been proposed with insert a bandstop performance resonators [1,2], consist of two different size or type resonators with common feed structure [3,4,5,6,7], stepped-impedance resonators (SIRs) [8,9,10,11], stub-loaded resonators (SLRs) [12,13,14,15,16,17,18,19,20,21], other types multi-mode resonators (MMRs) [22,23,24,25], and substrate integrated waveguide (SIW) structures [26,27]. In [1], a synthesizing method is presented to design dualband by consist of a wideband bandpass filter and a stopband filter.…”

A filter design method based on higher-order modes of fan-shaped half-mode substrate integrated waveguide resonator

“…However, the sizes are large and the design procedures are complex. For miniaturization, half-mode and one-third mode SIW resonators are proposed [17,18], but few are used to develop multiband BPF [19,20,21]. Recently, various SIW tri-mode resonators have been reported [22,23,24,25], but it is hard to design tri-band BPF due to the difficulty in controlling the three modes [26].…”

Design of Micro-strip Symmetrical Dual-band Filter Based on Wireless Sensor Network Nodes

“…In recent years, scholars in various countries have carried out in-depth research and proposed various design methods to solve the two core problems in the design of multi-band micro-strip filters [14][15][16][17][18][19][20]: Firstly, multi-point frequency selection can be realized, multi-frequency can work in parallel, and each central frequency point has a certain capacity bandwidth; secondly, the signals in adjacent frequency bands must be effectively isolated and can not interfere with each other, and the out-of-band rejection performance of the filter is reliable. There are two main methods for designing multi-band filters [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]: Firstly, based on the combination of multi-band filters, including the cascade of broadband filters and notch filters, and the parallel connection of multiple filters in different frequency bands; secondly, based on the parasitic frequency of resonators, a multi-band filter is designed.…”