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.
|Number of pages||7|
|Journal||IEEE Transactions on Microwave Theory and Techniques|
|Publication status||Published - Aug 2010|
- Dual-mode resonator filter
- microstrip filters
- tunable filter