Design of compact dual‐band bandpass filter using dual‐mode stepped‐impedance stub resonators

Abstract

A dual-band bandpass filter (BPF) using a novel stepped-impedance stub resonator (SISR) is presented. The proposed SISR is found to have the advantage that the even-mode resonant frequencies can be flexibly controlled, whereas the odd-mode resonant frequencies are fixed. Based on the proposed SISR, a dual-band filter is implemented by tuning its geometric parameters. To improve the selectivity, a filter with four transmission zeros on either side of both passbands is designed by introducing a 0°feeding structure. A prototype of a dual-band BPF centred at 1.84 and 2.65 GHz has been designed and fabricated. The measured results validate the full-wave EM simulated results.

A controllable compact dual-band bandpass filter using loaded open-loop resonators

“…Therefore, the systems prefer multiband transceiver to multiple single band ones. To response this need, multi-band BPFs are intensively investigated and various design approaches have been reported [1,2,3,4,5,6,7]. The dual-band BPF can be realized by utilizing planar filter with open-loop resonator [1].…”

Compact Planar Quad-Band Bandpass Filter for Application in Gps, Wlan, Wimax and 5g Wifi

“…A popular approach for designing dual-and tri-band BPFs is the utilization of multi-mode resonators (MMRs) [1][2][3][4][5]. In [1], dual-band BPFs are presented using dual-mode stub-loaded stepped impedance resonators.…”

“…In [1], dual-band BPFs are presented using dual-mode stub-loaded stepped impedance resonators. Resonant frequencies are controlled with stub dimensions.…”

Compact and High Selectivity Tri-Band Bandpass Filter Using Multipath-Embedded Resonators

“…The resonance characteristics of the proposed resonator are analyzed, and its design graph containing the normalized f 2 /f 1 and length ratio of α with admittance ratio of K is given. Based on the odd-and even-mode method analysis [17], the first three resonance frequencies corresponding to three paths can be determined according to given design specifications. To verify its performance, a tri-band BPF based on MERs is successfully designed and fabricated.…”

“…Path 2 is designed at 3.08 GHz by using asymmetric half-wavelength SIRs. In our previous work [17], we used the even-oddmode method to analyse the resonator mechanism of path 1 and path 2. We can derive that the resonant frequencies of even-mode (path 2) are well adjusted, whereas that of odd-mode (path 1) is fixed.…”