New Dual Band Dual-Mode Microstrip Patch Bandpass Filter Designs Based on Sierpinski Fractal Geometry

Abstract

Dual band dual mode chebychev microstrip bandpass filter designs are introduced for first time in this paper. The proposed filter designs are based on the use of dual mode square slotted patch microstrip resonator. These filter structures are fractally generated using Sierpinski fractal curve geometry applied to the conventional square microstrip patch from 1 st to 2 nd iteration levels where the first band designed at fundamental frequencies (5.475 ,5.45 and 5.4) GHz for each iteration while the second band( 8.925,9.15,9.05) GHz for each iteration. These filters have been designed using a substrate with a dielectric constant of 10.8 and thickness of 1.27mm.The performance of filter structures, based on resonators has been evaluated using a full-wave based electromagnetic simulator Sonnet software package. Performance simulation results show that these filter structures are compact in addition to good frequency responses and narrow bands gained .

Design of dual-mode SIR bandpass filter based on shorting pin for wireless communication applications

“…Dual mode resonators have very desirable features for design of band-pass filter (BPF), like low radiation loss, size miniaturization, and ease designing due to transmission line theory. The dual mode microstrip filters are significant in minimization techniques due to the high performance, they can be implemented as a double circuit in one structure with compared to designs of single mode band-pass filter when two decadent modes are coupled to each other by appropriate disturbance stimulation [6][7][8]. A dual mode resonator can be used as a double tuned circuit [9].…”

A Compact Dual-Band BPF Based on Open Loop Resonator for Satellite Communication Applications

“…Because of the possibility of obtaining a miniaturized size, so many researchers have adopted the open loop resonators in microstrip filter design [2][3][4][5][6][7][8][9]. Open loop resonator can be found in different configurations fractal line open loop resonator due to the remarkable features of the fractal geometry like self-similarity and space filling [10][11][12][13]. Miniaturization of open loop resonator can be realized by loading with different passive elements [14][15][16][17][18].…”

Dual-band second order microstrip filter using dual-mode perturbed meander loop resonators

“…Previous work conducted on this topic has been focused on investigating filters utilizing single dual-mode resonators to synthesize either single-band second order or dual-band first order responses [1 ]- [3]. However, system requirements often dictate a minimum of a second-order response in the transmission characteristic of the filter, especially for systems operating near heavily congested adjacent bands.…”

“…Fractal structures have previously been utilized in filter applications to generate closed-loop resonators [1 ]- [3] and as replacement for microstrip transmission line structures [4], [5]. The symmetric nature of these structures can be exploited in order to synthesize dual resonances in a single structure through the use of perturbations inserted along the resonators' symmetry plane [1].…”