A Compact Wideband Bandpass Filter Using Novel CSRR Loaded Qmsiw Resonator With High Selectivity

Abstract

Abstract-A novel quarter-mode substrate integrated waveguide (QMSIW) resonator with back-to-back triangular complementary split-ring resonators (CSRRs) etched on the waveguide surface is proposed in this paper. The proposed CSRR structures allow the implementation of a forward-wave passband propagating with high selectivity below the characteristic cutoff frequency of the conventional QMSIW. Utilizing the property of flexible open structure on QMSIWs' two sides, a cascaded quadruplet (CQ) bandpass filter (BPF) using the proposed QMSIW resonator and proximity coupling structure is presented. Compared with some other reported BPFs with SIW technique, the presented BPF using the novel QMSIW resonator has great improvements on size reduction and selectivity, simultaneously, with simple geometry. At the center frequency of 3.7 GHz, the designed BPF filter achieves a wideband with a fractional bandwidth up to 24.3% and a high selectivity with a shape factor of 1.23. The compact dimension of this filter is as small as 0.36λ g × 0.36λ g , where λ g is the guide wavelength at the center frequency. The proposed filter is simulated, fabricated and tested. The measured results are in good agreement with the simulation.

A CSRR-Fed SIW Cavity-Backed Fractal Patch Antenna for Wireless Energy Harvesting and Communication

“…The emerging substrate integrated waveguide (SIW) technique has gained renewed attention for the integration of planar and non-planar circuits into a simple and low-cost PCB or LTCC fabrication process [ 1 , 2 ]. Then, the traditional waveguide, which is costly with a bulky non-planar hollow rectangular structure and high power capacity, can be synthesized into a planar substrate with metalized slots or even arrays of metallic via posts.…”

Compact Multi-Band Filter Based on Multi-Ring Complementary Split Ring Resonators

“…Moreover, it was demonstrated that the split ring resonator SRR has a very narrow band response compared to the complementary split ring resonator [11]. Recently, complementary split ring resonator is more frequently used for the design of filters with wide and deep stopbands [12][13][14][15]. Band-reject filters were as well designed based on the defected ground structure (DGS) technology [16][17][18][19].…”

Design and implementation of a Quarter Mode Substrate Integrated Waveguide (QMSIW) cavity filter

“…Many efforts have been exerted to design filters using SIW, HMSIW and HMFSIW cavities [3]- [5]- [6] at difference frequencies with and without cross coupling [7]- [8]- [9]- [19] to give different responses, filters designed were with different cavities shapes, circular, triangular, square [10]- [11]- [12]- [13], loaded or not loaded, single or multi-mode and other types [14]- [15]- [16]- [26].…”