Analysis of doubly periodic electromagnetic bandgap filters in coplanar waveguide technology

Francisco Falcone; Ferran Martin; J. Bonache; Txema Lopetegi; Miguel A.G. Laso; Mario Sorolla

doi:10.1117/12.560684

7 April 2004 Analysis of doubly periodic electromagnetic bandgap filters in coplanar waveguide technology

Francisco Falcone, Ferran Martin, J. Bonache, Txema Lopetegi, Miguel A.G. Laso, Mario Sorolla

Proceedings Volume 5445, Microwave and Optical Technology 2003; (2004) https://doi.org/10.1117/12.560684
Event: Microwave and Optical Technology 2003, 2003, Ostrava, Czech Republic

Abstract

The use of Electromagnetic Bandgap (EBG) structures has proven to be effective in the implementation of many devices in planar circuit technology, such as filters, couplers and antenna design. In this paper, a low pass filter based in EBG structures in coplanar waveguide (CPW) technology is proposed. The device consists in a periodically loaded CPW with shunt capacitive elements. This way, a low pass frequency response is obtained. The capacitive elements are formed by t-shaped fingers that extend from the central conductor strip to both ground planes. Further enhancement is achieved by introducing a second periodicity in the central conductor strip, modulating the width of the strip. By doing so, effective rejection of undesired frequency harmonics is achieved. Full wave simulation results as well as measurement from fabricated prototypes confirm the performance of the proposed low pass filter, which exhibits low insertion losses in the passband, high rejection slope and effective rejection of undesired harmonics. Another advantage is the small footprint, due to the inherent slow-wave nature of the device.

Citation Download Citation

Francisco Falcone, Ferran Martin, J. Bonache, Txema Lopetegi, Miguel A.G. Laso, and Mario Sorolla "Analysis of doubly periodic electromagnetic bandgap filters in coplanar waveguide technology", Proc. SPIE 5445, Microwave and Optical Technology 2003, (7 April 2004); https://doi.org/10.1117/12.560684

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