A Novel Low-Pass Filter With an Embedded Band-Stop Structure for Improved Stop-Band Characteristics

This letter presents a novel design of a microstrip low- pass filter (LPF) with an embedded band-stop structure, which is constructed from a simple two transmission line band-stop filter. The band-stop structure is ingeniously embedded into a classical step-impedance microstrip LPF. The stop-band of...

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Veröffentlicht in:	IEEE microwave and wireless components letters 2009-10, Vol.19 (10), p.629-631
Hauptverfasser:	Qijuan He, Qijuan He, Changjun Liu, Changjun Liu
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Band-stop filters Banded structure Circuit properties Construction Cut-off Cutoff frequency Electric, optical and optoelectronic circuits Electronic circuits Electronics Embedded structures Exact sciences and technology Frequency filters Impedance Low pass filters low-pass filters (LPFs) microstrip Microstrip filters Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits Microwave filters Microwaves Performance enhancement Resonator filters Transmission line matrix methods Transmission line measurements Transmission lines
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Beschreibung
Zusammenfassung:	This letter presents a novel design of a microstrip low- pass filter (LPF) with an embedded band-stop structure, which is constructed from a simple two transmission line band-stop filter. The band-stop structure is ingeniously embedded into a classical step-impedance microstrip LPF. The stop-band of the proposed LPF is more than two times broader than the original design, while its cut-off frequency remains at 1.8 GHz. The embedded structure does not increase the physical dimension of the LPF, but improves the performance significantly. Measured results agree with simuAcircnot lation well, and validate the dual-frequency design method.
ISSN:	1531-1309 2771-957X 1558-1764 2771-9588
DOI:	10.1109/LMWC.2009.2029738