Transmission-line filters with capacitively loaded coupled lines

Transmission-line filters with capacitively loaded coupled lines

Coupled lines with loads at one end, which can create tunable transmission zeros, are studied in this paper. The equation for the transmission zeros is derived from the analysis of even- and odd-mode excitations. Based on this equation, coupled lines with different loads are analyzed and the rules f...

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Veröffentlicht in:IEEE transactions on microwave theory and techniques 2003-05, Vol.51 (5), p.1517-1524
Hauptverfasser: Tsai, Chih-Ming, Lee, Sheng-Yuan, Lee, Hong-Ming
Format: Artikel
Sprache:eng
Schlagworte:
Coupling circuits
Design engineering
Equations
Excitation
Feeds
Filtering theory
Frequency
Interference
Mathematical analysis
Microwave circuits
Microwave filters
Microwaves
Resonator filters
Transmission lines
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Beschreibung
Zusammenfassung:Coupled lines with loads at one end, which can create tunable transmission zeros, are studied in this paper. The equation for the transmission zeros is derived from the analysis of even- and odd-mode excitations. Based on this equation, coupled lines with different loads are analyzed and the rules for controlling the transmission-zero frequency are given. The structures are used in the designs of several second-order filters and they are experimentally verified. The use of a skew-symmetric (0/spl deg/) feed structure in these filters is also discussed and an example is given.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2003.810133