Compact fixed and tune-all bandpass filters based on coupled slow-wave resonators

A compact topology for bandpass filters based on coupled slow-wave resonators is demonstrated. A study of fixed bandpass filters leads to design rules and equations. Measurements on a 0.7-GHz fixed bandpass filter, consisting of three coupled slow-wave resonators, demonstrate the validity of the pro...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-06, Vol.54 (6), p.2790-2799
Main Authors: Pistono, E., Robert, M., Duvillaret, L., Duchamp, J.-M., Vilcot, A., Ferrari, P.
Format: Article
Language:English
Subjects:
Applied sciences
Band pass filters
Bandpass filters
Bandwidth
Circuit properties
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic tubes, masers
Electronics
Electronics industry
Equations
Exact sciences and technology
Frequency
Frequency filters
Insertion loss
Mathematical analysis
Microwave bandpass filter
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Noise levels
Oscillators, resonators, synthetizers
Q factor
Resonator filters
Resonators
Semiconductors
slow-wave structures
Testing
Topology
tunable filter
Tuning
varactors
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Summary:A compact topology for bandpass filters based on coupled slow-wave resonators is demonstrated. A study of fixed bandpass filters leads to design rules and equations. Measurements on a 0.7-GHz fixed bandpass filter, consisting of three coupled slow-wave resonators, demonstrate the validity of the proposed topology and validate the theory, since the agreement between simulations and measurements is very good. Designed for a Q-factor of 5, this filter shows a Q of approximately 5.2. At the center frequency, insertion loss is 0.6 dB and return loss is greater than 20 dB. A 0.7-GHz tune-all bandpass filter is also designed and tested. The performance of this electronically tuned filter, which incorporates semiconductor varactors, is promising in terms of wide continuous center-frequency and bandwidth tunings. For a center-frequency tuning of plusmn18% around 0.7 GHz, the -3-dB bandwidth can be simultaneously tuned between ~50 and ~78 MHz, with an insertion loss smaller than 5 dB and a return loss greater than 13 dB at the center frequency. The surface areas of the fixed and tunable 0.7-GHz filters are, respectively, ~16 and ~20 cm 2
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.874894