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Parallel coupled microstrip filters with ground-plane aperture for spurious band suppression and enhanced coupling

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

Parallel coupled microstrip sections with a slotted ground plane are proposed as building blocks of coupled-line microstrip filters with enhanced performance. It is shown that, by proper adjustment of the ground-plane slot dimensions, the double frequency spurious band associated with unequal even/odd electrical lengths can be suppressed or meaningfully reduced. As an additional feature, this simple design relaxes tolerances of strip width and spacing in those cases where tightly coupled high-impedance sections are required. A rough preliminary design can be obtained within a few seconds using a fast optimization algorithm based on a quasi-TEM analysis of the coupled sections. Fine tuning is based on the use of a commercial electromagnetic simulator. Finally, experimental check of filter performance is provided.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:52 ,  Issue: 3 )