A New Tri-Band Bandpass Filter Based on Stub-Loaded Step-Impedance Resonator

A New Tri-Band Bandpass Filter Based on Stub-Loaded Step-Impedance Resonator

A tri-band bandpass filter designed based on a stub-loaded step-impedance resonator (SIR) is proposed. The resonant behavior of the stub-loaded SIR is analyzed. By properly controlling the impedance ratio K 1 , the length ratio (α) and the length ratio (r) of the stub-loaded SIR, the center frequenc...

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Veröffentlicht in:IEEE microwave and wireless components letters 2012-04, Vol.22 (4), p.179-181
Hauptverfasser: CHEN, Wei-Yu, WENG, Min-Hang, CHANG, Shoou-Jinn
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Band pass filters
Bandpass filters
Bandwidth
Circuit properties
Couplings
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Feeds
Filter
Frequency filters
Geographic information systems
Global Positioning System
Impedance
Microwaves
Oscillators, resonators, synthetizers
Passband
Radiolocalization and radionavigation
Resonant frequency
Resonators
Satellite navigation systems
Satellite telecommunications. Space telecommunications
Simulation
step-impedance resonator (SIR)
Telecommunications
Telecommunications and information theory
tri-band
Wireless communication
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Beschreibung
Zusammenfassung:A tri-band bandpass filter designed based on a stub-loaded step-impedance resonator (SIR) is proposed. The resonant behavior of the stub-loaded SIR is analyzed. By properly controlling the impedance ratio K 1 , the length ratio (α) and the length ratio (r) of the stub-loaded SIR, the center frequencies are designed at 1.575, 2.4, and 3.5 GHz, respectively, corresponding to the GPS, WLAN and WiMAX applications. Furthermore, a 0° feed structure is used to provide at least one transmission zero near passband edge of each passband, resulting in high selectivity. Experimental results show good agreement with the simulated results.
ISSN:1531-1309
2771-957X
1558-1764
2771-9588
DOI:10.1109/LMWC.2012.2187884