Dual Passband Filter Using Hybrid Microstrip Split Ring Resonators and Coplanar Waveguide Quarter Wavelength Resonators

Abstract

A novel dual passband filter using hybrid microstrip split ring resonators and coplanar wavelength (CPW) quarter wavelength resonators is presented.An equivalent RLC circuit model is presented, and its corresponding parameters are also extracted from the theoretical analysis. The proposed dual passband filter has two passbands with the center frequencies of 2.44 GHz and 3.5 GHz. Good agreement among equivalent circuit (EC), electromagnetic (EM) simulated and measured results is demonstrated.

Dual-band bandpass filter based on mixed electric and magnetic coupling of the hybrid quasi-lumped resonator

“…The source-load cross coupling is utilised to design a dual-band bandpass filter with good frequency selectivity (Chen & Chu, 2011), but since the structure is based on cascaded triplet (CT) unit, the final design suffers from large size. The coplanar waveguide is also used in dual-band filter design (Lin, Shi, Chen, Wang and Bai 2011). Combined with the microstrip split ring resonator, the authors constructed a dual-band bandpass filter the good out-of-band suppression, unfortunately only one transmission zero is generated.…”

Compact Dual-Passband Filter Using Spiral Resonators

“…With the rapid development of dual-and multi-band wireless communication systems, dual-band filters are paid more and more attentions, which should be compact, low loss, and compatible with systems in package. Then, various of dual-band filters have been presented [12][13][14][15][16][17][18][19][20][21][22]. A dual-band filter was constructed by cascading two individual filters with two specified single passbands in [12], while a dual-band filter was constructed by cascading a wideband bandpass filter and a narrowband bandstop filter [13].…”

“…However, these dual-band filters have limited controllable bandwidth. The coplanar waveguide is also involved [22], combined with the microstrip split ring resonator, the authors constructed a dual-band bandpass filter the good out-of-band suppression, unfortunately only one transmission zero is generated. In [1], the author concentrated on stopband extension, though a deep wide stopband is realized, the frequency selectivity of the filter is not good.…”