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A Study on Millimetre-Wave Tunable Bandpass Filter Based on Polymer Cap Deflection

Author(s): Seonho Seok | Janggil Kim | Nathalie Rolland | Paul-Alain Rolland

Journal: Micromachines
ISSN 2072-666X

Volume: 3;
Issue: 1;
Start page: 28;
Date: 2012;
Original page

Keywords: BCB polymer | filter | tuning | millimeter-wave

This paper presents a new tuning mechanism for millimetre-wave BPF based on deflection of the BCB membrane of BCB packaging cap. A 3-pole parallel-coupled microstrip filter operating at 60 GHz is first implemented on 30 µm-thick BCB polymer substrate and then BCB-capped through our new anti-adhesion layer assisted wafer-level transfer technique. Gold electrodes are fabricated on top of the BCB cap for DC actuation. The implemented BCB capped BPF showed the tuning range of 1.49 GHz from 63.36 GHz to 64.85 GHz with the associated insertion losses of −9.7 dB and −9.4 dB and the return losses better than −11 dB over the tuning range.
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