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Miniaturized microwave tunable bandpass filters on high-k LTCC with integrated resistive vias as bias-T

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4 Author(s)
Xiaoyu Mi, ; 3D-Integration Technol. Res. Dept., RF MEMS Technol. Res. Lab., Akashi, Japan ; Toyoda, O. ; Ueda, S. ; Nakazawa, F.

This paper describes a MEMS tunable bandpass filter operating in the S band region and featuring a low insertion loss of -2.3 dB and small size of 3.7 mm by 4.1 mm. The tunable filter is based on MEMS-varactors-loaded microstrip resonators and has been directly constructed on a high-k low-temperature-co-fired-ceramics (LTCC) wiring wafer whose dielectric constant is 50, using MEMS-on-LTCC technology. The RF signal paths are isolated from the MEMS driving paths by built-in high-resistivity-vias, leading to low insertion loss. RF power-proof performance was evaluated by applying OFDM signals to the device. The results confirm that MEMS tunable filters are sufficiently linear at cell phone power level.

Published in:

Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International

Date of Conference:

5-10 June 2011