A Novel Single and Dual-Band Miniaturized Matched Band-Stop Filter Using Stepped Impedance Resonator

Abstract

Abstract-In this paper in order to reduce the size and improve the performance of microwave filter, novel single and dual band matched band-stop filters are developed. A stepped impedance dual mode resonator is used, resulting in a much more compact size, than the conventional dual mode ring resonator that has an electrical length of 360 • . The proposed prototype is able to achieve high stop band attenuation even with low Q factor values. Moreover, for the short electrical length of this filter, the first spurious resonance occurs at 4.7 times the fundamental resonance frequency. Therefore, the proposed technique selectively removes only the fundamental resonance frequency when such a resonator is implemented. A theoretical analysis, along with an experimental prototype is proposed in order to demonstrate the feasibility of these proposed networks.

A compact dual‐band bandstop filter using a circular, folded, symmetric, meandered‐line, stepped‐impedance resonator

“…The fabricated design demonstrate a drastically miniaturised size, good insertion loss using relatively lower value of the dielectric constant and substrate thickness with a good frequency selectivity in the vicinity of the resonance frequencies. The near-field microwave systems for detection and sensing have found more and more applications in recent years [1], such as in the areas of biomedical imaging and diagnosis systems [2,3], production process control and monitoring [4], quality classification and defect detection [5], and so forth. One challenge which has stayed for years in such applications is that the objects to be detected or imaged are often located inside lossy materials, such as human bodies, foods, tree timbers, pharmaceutical particles, and so forth.…”

“…Recently, a growing body of research has focused on the exploration of compact dual-band bandstop filters (DBBSFs) as a key component for evolving WiMAX applications of the future. The previous topology of filter design fails to meet the required compact size and high selectivity [1][2][3][4]. Thus, we proposed a circular, folded, symmetric-type, meandered-line, stepped-impedance resonator (SIR) with dual-band bandstop characteristics.…”

“…To minimize the effective area of the filter, the length of the high impedance section of the resonator was modified by bending along the width. The size of the proposed DBBSF was reduced by 90 and 79% compared with the other filters [1,2]. The filter can be used to suppress the central resonant frequency by more than 26 dB in the stop bands and simultaneously achieve an ultrawide stop band with a fractional bandwidth of 50.47 and 16.82% for the first and second frequency band, respectively.…”

Stepped impedance dual mode coaxial filter

“…Another way to achieve a smaller curcuit size resonator is to design a filter using stepped-impedence resonator. The stepped-impedance resonator has been popularly used due to its advatages of achieving smaller size and better spurious performance [17]- [25]. Until recently, the dual-mode filter with a significant size reduction and better electrical performance was introduced [26].…”

Bandstop to Allpass Reconfigurable Filter Technique in SPDT Switch Design

“…Recently, new designs of bandstop to allpass reconfigurable filters were investigated and reported in [19][20][21][22]. This includes a potential bandstop to allpass reconfigurable filter using stepped impedance dual mode resonator [18,23].…”