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Design of Compact Low-Pass Elliptic Filters Using Double-Sided MIC Technology

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3 Author(s)
Velazquez-Ahumada, Md.C. ; Departamento de Electronica y Electromagnetismo, Univ. de Sevilla ; Martel, J. ; Medina, F.

A novel implementation of stepped-impedance low-pass elliptic filters is presented in this paper. The filters are based on the well-known technique of cascading high- and low-impedance sections to simulate the ladder LC lumped-circuit prototype. We propose in this study a new approach to build up the constitutive circuit elements by taking advantage of the use of both sides of the substrate. The use of double-sided technology yields both design flexibility and good circuit performance. High-impedance sections are achieved by using slots in the backside of the substrate, whereas low-impedance sections are obtained with parallel-plate capacitors. In order to achieve the transmission poles corresponding to the elliptic design, these capacitors are series connected to the ground plane by means of high-impedance coplanar-waveguide lines, which mainly act as inductors. As a final step, meandering techniques have been applied to the high-impedance sections of the filter to reduce the overall circuit size. The measurement of several fabricated filters shows fairly good agreement between theory and experiment

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:55 ,  Issue: 1 )