Title :
Compact tunable 2.1–2.9 GHz band-pass filter using a novel vertical stepped-impedance resonator
Author :
Tao Yang ; Rebeiz, Gabriel M.
Author_Institution :
Univ. of California, San Diego, La Jolla, CA, USA
Abstract :
A novel vertical stepped-impedance resonator (SIR) is proposed based on the conventional multi-layer printed-circuit board (PCB), exhibiting high unloaded quality factor (Q = 185), compact size and low electromagnetic (EM) coupling to nearby RF circuits. The proposed resonator is used in a 2-3 GHz 4-pole tunable bandpass filter. The resulting filter occupies a footprint of 13 mm × 15 mm and covers a frequency range of 2.1 - 2.9 GHz. In addition, to improve the filter selectivity, multiple transmission zeroes are obtained in each tuning state by employing source-to-load coupling and cross-coupling between non-adjacent resonators. To our knowledge, this represents a new way to fabricate compact high-performance shielded filters in low-cost PCB technology.
Keywords :
Q-factor; band-pass filters; electromagnetic coupling; integrated circuit design; microwave filters; printed circuits; resonator filters; tuning; EM coupling; RF circuits; SIR; compact high-performance shielded filters; compact tunable band-pass filter; cross-coupling; electromagnetic coupling; filter selectivity; four-pole tunable bandpass filter; frequency 2.1 GHz to 2.9 GHz; low-cost PCB technology; multilayer printed circuit board; multiple transmission zeroes; nonadjacent resonators; size 13 mm; size 15 mm; source-to-load coupling; tuning state; unloaded quality factor; vertical stepped-impedance resonator; Impedance matching; Microwave filters; Nonhomogeneous media; Radio access networks; Resonant frequency; Resonator filters; Varactors; Vertical resonator; multiple transmission zeros; stepped-impedance resonator (SIR); tunable filter;
Conference_Titel :
Microwave Symposium (IMS), 2014 IEEE MTT-S International
Conference_Location :
Tampa, FL
DOI :
10.1109/MWSYM.2014.6848389
