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A compact low-loss reconfigurable monolithic low-pass filter using multiple-contact MEMS switches

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6 Author(s)
Sanghyo Lee ; Sch. of Electr. Eng., Center for 3-D Millimeter-Wave Integrated Syst., Seoul, South Korea ; Jae-Hyoung Park ; Jung-Mu Kim ; Hong-Teuk Kim
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A high-performance reconfigurable low-pass filter based on the quasifractal self-similar structures has been developed at millimeter-waves using multiple-contact MEMS switches. Three-cell cascaded low-pass structure was reconfigured to one-cell low-pass counterpart by activating the micromachined switches to achieve 3:1 frequency scaling. Two types of special multiple-contact MEMS switches were developed to reduce the number of switching elements as well as to reduce the insertion loss and, thus, extend the operating frequencies to mm-waves. In addition, bias-decoupling circuits were eliminated, resulting in a small chip size of 1.2 mm × 1.5 mm. The measured 3-dB cut-off frequency of the reconfigurable low-pass filter changed from 67 GHz to 28 GHz with minor change in the insertion loss from 0.32 dB to 0.27 dB. This work demonstrates the possibility of high-performance compact-size reconfigurable filters at mm-waves using multiple-contact micromachined switches.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:14 ,  Issue: 1 )

Date of Publication:

Jan. 2004

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