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Varactor-Tuned Dual-Mode Bandpass Filters

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2 Author(s)
Wenxing Tang ; Department of Electrical, Electronic & Computer Engineering, School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh, United Kingdom ; Jia-Sheng Hong

This paper presents a new type of varactor-tuned dual-mode bandpass filter. Since the two operating modes (i.e., the odd and even modes) in a dual-mode microstrip open-loop resonator do not couple to each other, the tuning of the passband frequency becomes simple with a single dc-bias circuit while keeping nearly constant absolute bandwidth. Design equations and procedures are derived, and two two-pole tunable bandpass filters of this type are demonstrated experimentally.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:58 ,  Issue: 8 )