Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 59, Issue 4, Pages 866-876Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2011.2109006
Keywords
RF microelectromechanical systems (RF MEMS); spurious suppression; substrate integrated waveguide (SIW); tunable filter
Categories
Funding
- National Science Foundation (NSF) [0901088]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0901088] Funding Source: National Science Foundation
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This paper presents a high-performance substrate-integrated- waveguide RF microelectromechanical systems (MEMS) tunable filter for 1.2-1.6-GHz frequency range. The proposed filter is developed using packaged RF MEMS switches and utilizes a two-layer structure that effectively isolates the cavity filter from the RF MEMS switch circuitry. The two-pole filter implemented on RT/Duroid 6010LM exhibits an insertion loss of 2.2-4.1 dB and a return loss better than 15 dB for all tuning states. The relative bandwidth of the filter is 3.7 +/- 0.5% over the tuning range. The measured Q(u) of the filter is 93-132 over the tuning range, which is the best reported Q in filters using off-the-shelf RF MEMS switches on conventional printed circuit board substrates. In addition, an upper stopband rejection better than 28 dB is obtained up to 4.0 GHz by employing low-pass filters at the bandpass filter terminals at the cost of 0.7-1.0-dB increase in the insertion loss.
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