Abstract
This paper presents a compact C-band bandpass filter with improved out-of-band rejection. It consists of a symmetric three-pole parallel coupled line microstrip loaded with complementary split ring resonators (CSRRs) and slot resonators. Enhancements regarding the filter responses are obtained by etching these two parasitic shapes successively. When, CSRRs are introduced in the ground plane, exactly in the back of the transmission line of 50 -Ohms , improvements on the filter selectivity level are achieved. Whereas, the slot resonator elements are implemented on the feed line to permit the suppression of the second harmonics. To reduce the second harmonics of 11:1-13GHz, the parasitic elements are both combined, widen the filter rejection of 5:81%. The surface current distribution together with the equivalent circuit are also studied in order to demonstrate the slots and the CSRRs effect parameters on the behavior of the proposed filter. A prototype of the optimal filter is fabricated and measured.Theory and experiment results prove the validity of the new design procedure.
Highlights
Parallel-coupled line microstrip filters are known as one of the most commonly used designs in practical wireless communication and microwave applications, due to their design simplicity, planar structure, and relatively wide bandwidth [1]
We propose a design and analysis of a performed wideband bandpass filter based on complementary split ring resonators (CSRRs) and slot resonators
Two symmetrical resonator types such as Slot and CSRR elements are analyzed, regarding the second harmonics reduction. These parasitic elements are added to the circuit to yield spurious suppression and selectivity improvement for the desired resonance frequencies. These elements are loaded on the fiter design in two steps. exactly in the transmission line of 50 − Ω and below it respectively, see figures below.The experimental validation is done for the first case related to the spurious suppression and the selectivity enhancement
Summary
Parallel-coupled line microstrip filters are known as one of the most commonly used designs in practical wireless communication and microwave applications, due to their design simplicity, planar structure, and relatively wide bandwidth [1] This type of filter suffers from spurious responses that limit their performances and their integration in RF front-end of wireless microwave systems. The main objectives of this paper is to improve the filter selectivity, suppress the spurious response and eliminate the transmission at high frequency To achieve this , firstly, the parallel-coupled line microstrip bandpass filter is optimized to cover the microwave C-band from 4.6to7.5 GHz. Secondly, two symmetrical resonator types such as Slot and CSRR elements are analyzed, regarding the second harmonics reduction. The optimized design structure offers a miniaturized C-band bandpass filter with better out-of-band rejection
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