Abstract
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. © 2010 IEEE.
Original language | English |
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Article number | 5508429 |
Pages (from-to) | 2213-2219 |
Number of pages | 7 |
Journal | IEEE Transactions on Microwave Theory and Techniques |
Volume | 58 |
Issue number | 8 |
DOIs | |
Publication status | Published - Aug 2010 |
Keywords
- Dual-mode resonator filter
- microstrip filters
- tunable filter