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Reconfigurable Waveguide Filter with Variable Bandwidth and Center Frequency

Arnold, C.; Parlebas, J.; Zwick, T.

This paper presents a center frequency and bandwidth reconfiguration mechanism for waveguide microwave bandpass filters. The filters are designed to be used in the output section of a satellite communication system. While the center frequency of a bandpass filter can be tuned by changing the lengths of the filter resonators, the coupling irises as practical realizations of the impedance inverters cannot easily be adapted to a new value. The novel approach chosen in this paper is to replace the impedance inverters by a novel type of coupling structure. This coupling structure allows adjustment of the coupling by changing the length of a transmission line, which is equivalent to changing the resonant frequency of a coupling resonator. Design equations are presented to transform an impedance inverter into the proposed coupling structure. A synthesis procedure for bandwidth reconfigurable filters is proposed. The feasibility of coupling adaptation is proven based on a full-wave model of the coupling structure. The synthesis process is applied to a four-pole Chebyshev sidewall-coupled circular waveguide filter with 54- and 72-MHz bandwid ... mehr

Zugehörige Institution(en) am KIT Institut für Hochfrequenztechnik und Elektronik (IHE)
Publikationstyp Zeitschriftenaufsatz
Jahr 2014
Sprache Englisch
Identifikator ISSN: 0018-9480
KITopen ID: 1000045755
Erschienen in IEEE Transactions on Microwave Theory and Techniques
Band 62
Heft 8
Seiten 1663-1670
Schlagworte Chebyshev filters;band-pass filters; microwave filters;resonator filters; satellite communication; waveguide filters; bandwidth 54 MHz to 72 MHz; bandwidth reconfigurable filters;bandwidth reconfiguration mechanism; center frequency; coupling adaptation; coupling resonator; coupling structure; design equation;filter resonator length; four-pole Chebyshev sidewall-coupled circular waveguide filter; full-wave model; impedance inverter; insertion loss; reconfigurable waveguide filter; resonant frequency; return loss; satellite communication system; transmission line length; variable bandwidth; waveguide microwave bandpass filters; Bandwidth; Couplings;Impedance; Inverters; Power transmission lines; Resonant frequency; Tuning; Bandpass filters; coupling resonators;impedance inverters; reconfigurable filters; waveguide filters
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