Quad‐ and sext‐band bandpass filter based on multimode resonator utilizing SIRs‐loaded tapered‐line

Abstract

On a basis of multimode resonator (MMR) using SIRs‐loaded tapered‐line (SIRTL),novel quad‐ and sext‐band bandpass filter are investigated and fabricated. Due to some merits like existing accurate analytical technique, simplicity in construction and excellent matching behavior, parabolic tapered‐line are selected as the building block of MMR. In addition, with SIRs loaded at different points of tapered‐line, quad‐ and sext‐band responses can be obtained. Moreover, relationship between parabolic tapered‐line and profile of microstrip is set up. Accordingly, circular‐profile microstrip has been chosen to realize parabolic tapered‐line. Therefore, designs of quad‐ and sext‐band bandpass filter become available. Good agreement between simulated and measured results validates the design method.

A novel reconfigurable tri-mode resonator and its application to bandpass filter

“…Furthermore, its insertion loss is not good during the tuning range. In [9][10][11][12][13][14][15], the authors proposed a variety of multi-band BPF, some of which are excel---------------lent in performance. However, they are all fixed-bands filters and can not be tuned.…”

Multi-Band Bandpass Filter Using Novel Topology for Next-Generation IoT Wireless Systems

“…Nowadays, researchers are more focused on developing miniaturized quad-, penta-, and sext-band BPFs. Different design topologies have been adopted to develop quad-band BPF [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. A popular method to design a quad-band BPF is by using stub-loaded topology [9][10][11][12][13].…”

“…Five transmission zeros have been obtained around the passband to enhance the selectivity, whereas the insertion loss is quite high for each passband. Moreover, the SIR topology has been utilized to obtain quad-band BPF response [14,15,20]. In [14], open-circuited SIR loaded with short-circuited stubs is utilized to realize the quad-band BPF response with three transmission zeros across the four passbands.…”

Miniaturized Multiband Bandpass Filters Based on a Single Multimode Resonator Loading Branches

“…In the past, some research was conducted for the design of multiband BPFs. In [1][2][3][4][5][6], different quad-band BPFs were realized based on different approaches, Yan et al used two sets of short-stub-loaded E-Type resonators in [1], Bukuru et al investigated quad-mode stepped impedance resonator (QMSIR) in [2], Li et al realized novel quad-band bandpass filters on a basis of the multimode resonator (MMR) using SIRs loaded tapered-line (SIRTL) in [3], Kamma et al used T-shaped stubs loaded with a modified ring resonator (MRR) in [4], Zhang et al investigated three-layer stacked structures in [5], Li et al used two-/tri-section SIRs and stepped impedance inverters in [6]. And in [7][8][9], some quint-band BPFs were achieved using different structures, in [7], W.Yang used multimode resonators, Liu et al investigated uniform impedance resonators (UIRs) in [8], Hsu et al realized a quint-band BPF using five tri-mode stub-loaded SIRs in [9].…”