Table of Contents
International Journal of Microwave Science and Technology
Volume 2012, Article ID 650754, 4 pages
Research Article

Spatial Qualification Tests for Highly Selective Compact Micromachined Band Pass Planar Filters

1CSAM IEMN UMR 8520, Université de Lille 1/CNRS, Avenue Poincaré, Cité Scientifique, 59650 Villeneuve d’Ascq, France
2XLIM UMR 6172, Université de Limoges/CNRS, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France
3Thales Alénia Space, 26 Avenue Jean François Champollion 31100 Toulouse, France
4Reinhardt Microtech AG, Aeulistraβe 10, 7323 Wangs, Switzerland
5CNES, 18 Rue Edouard Belin, 31000 Toulouse, France

Received 1 June 2012; Accepted 20 August 2012

Academic Editor: Fermín Mira

Copyright © 2012 Raghida Hajj et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A highly selective planar band pass filter is proposed for satellite receivers to suppress intermodulation components. The 4-pole filter has a center frequency of 19.825 GHz with a bandwidth of 240 MHz. The measured quality factor is over 600 and the insertion losses are 4.1 dB. The micromachining technological process is used to fabricate this filter. A BCB (benzocyclobutene) thin layer is used as an electrical and mechanical support for the filter. The compatibility of the BCB with the spatial constraints was tested. Various tests were accomplished for this purpose and the results of all these tests are presented in the paper. The tests showed a very small influence of the temperature variation and high temperature storage test and practically no influence of the radiation test on the circuit.