Parametric studies of ring and parallel coupled line resonators for matched bandstop filter design

Abstract

Recently, matched bandstop filters had become a substantial part of modern RF and microwave systems. However, in these types of filters, the key problem in the couplings of any microstrip resonators to transmission microstrip line is the variation or tolerance of the coupling gap. It was found that the bandstop response is very sensitive to the gap size of the coupled line. Therefore, this paper presents parametric studies of dual-mode parallel coupled line and ring resonator for matched bandstop filter design. For parallel coupled line resonator, it was found that with careful design and proper circuit parametric study on the coupling spacing, very high notch and matched return loss response were obtained. In contrast, for ring resonator, based on the simulated result, it was found that a very high notch and matched return loss response were obtained with careful design and proper circuit parametric study on the coupling spacing, width at coupling lines, and perturbed stub length.

Simple broadband circularly polarized monopole antenna with two asymmetrically connected U-shaped parasitic strips and defective ground plane

“…To assess the effects of several critical parameters on IBW and ARBW, this section presents the study on three parameters (lf2, g, lt1). The method of parametric study is based on [27][28][29][30][31][32][33].…”

Inter-connected coupled lines Resonator topology for bandpass filter application

“…The resonance frequency can be controlled easily by varying the length of coupled-lines whereas the insertion and return loss can be controlled by varying the width and gap of the coupled-lines. However, the tolerance of coupling gap is the crucial issue in the coupled-line resonator [16]. To illustrate the concept, the side-coupled shorted half-wavelength resonator is simulated using full-wave electromagnetic simulation tool.…”