Compact quint‐band Bandpass Filter design in a rigorous manner utilizing multimode stub‐loaded taper

Abstract

On a basis of 2 multimode resonators (MMRs) using stub‐loaded taper, a compact quint‐band BPF is proposed. Progressively, triple open‐circuited stubs and notch are loaded to taper without introducing extra coupling paths, and both tri‐, quad‐ and quint‐band BPF responses are available. In this way, design procedure is rigorous and reduction of coupling paths minimizes the quint‐band BPF design complexity, simultaneously. Meanwhile, owing to the cancelling effect of notch, independent control on central frequencies of 2 passbands can be achieved. The insertion loss is lower since taper is adopted to the building of MMR. Good agreement between simulated and measured results validates the design method.

Dual-/Tri-Wideband Bandpass Filter with High Selectivity and Adjustable Passband for 5G Mid-Band Mobile Communications

“…Most importantly, the FOLSIR in our filters is obtained by a novel structural deformation of SIR. In the existing multi-band BPFs researches, the center frequencies (CFs) of passbands are usually reduced by increasing the length or width of loaded stubs [34][35][36][37]. However, the increase of the CFs is limited when the loaded-stub length is reduced to zero.…”

Compact metamaterial inspired structure with bandpass characteristics for penta‐band applications using virtual ground concept

“…Multiple passband filters with compact size, low insertion loss, and high selectivity are required in modern wireless communication systems . In recent times, few studies have been published for dual‐band bandpass filters (BPFs), triple‐band BPFs, quad‐band BPFs, and penta‐band BPFs . In Reference , by using short‐circuited stubs and multiple coupled poles, transmission zeros based dual‐band BPF was obtained with high selectivity.…”

“…Center frequency of each passband can be controlled independently. BPFs have been designed with penta‐band response using multimode and stepped impedance resonators with good electrical characteristics …”

“…1 In recent times, few studies have been published for dual-band bandpass filters (BPFs), 2,3 triple-band BPFs, 4,5 quad-band BPFs, 6,7 and penta-band BPFs. [8][9][10][11] In Reference 2, by using short-circuited stubs and multiple coupled poles, transmission zeros based dual-band BPF was obtained with high selectivity. The coplanar waveguide-based dual-band filter has been designed using complementary split ring resonator (CSRR), in which the zeroth-order resonance frequency was controlled by shunt parameters.…”

“…BPFs have been designed with penta-band response using multimode and stepped impedance resonators with good electrical characteristics. 11 A revolutionary property of metamaterial (MTM) of effective homogeneity conditions has been utilized to reduce the size of filters. 12 MTMs are artificial engineering electromagnetic structures with negative refractive index and zero phase constant, realized with composite right-left handed transmission line.…”