Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 59, Issue 10, Pages 2469-2476Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2011.2163166
Keywords
Bandwidth tunable filter; high-Q filter; RF micro-electromechanical systems (MEMS); suspended stripline; tunable filter
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Funding
- Defense Advanced Research Projects Agency (DARPA) under Rockwell Collins
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This paper presents a high-Q two-pole tunable filter with frequency and bandwidth control. The filter is implemented using suspended-stripline ring resonators and planar RF micro-electromechanical systems capacitive networks. A tuning range of 3.7-5.95 GHz with an absolute 1-dB bandwidth of 110 +/- 20 MHz (3.6%-1.7% fractional bandwidth) is first demonstrated with an insertion loss < 2.5 dB. The bandwidth can be controlled at any frequency, and a 1-dB bandwidth of 90-515 MHz is also demonstrated at 5.5 GHz. The measured Q(u) is 115-250 at 3.7-5.95 GHz. The measured third-order intermodulation intercept point and 1-dB power compression point are > 35 dBm (Delta f = 300 kHz) and 20 dBm, respectively. To our knowledge, this filter represents the state-of-the-art in tuning performance and Q for planar designs at 2-6 GHz.
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