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New class of SiGe reduced-size loaded slow wave 60 GHz CPW series/shunt stubs and its applications to the design of slow wave bandpass filters

Published online by Cambridge University Press:  01 July 2010

Khelifa Hettak ,
Gilbert A. Morin  and
Malcolm G. Stubbs
Khelifa Hettak*
Affiliation:
Communications Research Centre Canada, 3701 Carling Avenue, P.O. Box 11490, Station “H”, Ottawa, Ontario, CanadaK2H 8S2. Phone: 613 998 5216; Fax: 613 990 8369.
Gilbert A. Morin
Affiliation:
Defence R&D Canada – Ottawa, Ontario, CanadaK1A 0Z4.
Malcolm G. Stubbs
Affiliation:
Communications Research Centre Canada, 3701 Carling Avenue, P.O. Box 11490, Station “H”, Ottawa, Ontario, CanadaK2H 8S2. Phone: 613 998 5216; Fax: 613 990 8369.
*
Corresponding author: K. Hettak Email: khelifa.hettak@crc.ca
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Abstract

This paper proposes a practical approach for developing a new class of compact slow-wave coplanar waveguide (CPW) series/shunt stubs, which offer 40% reduction in size relative to a conventional design. It demonstrates that the technique using interdigitated capacitive loading can provide size and cost reductions, while also providing performance enhancements such as better return loss. The experimental prototypes presented in this paper demonstrate the validity of the design method and the ability to print interdigitated capacitors inside the center conductor of the series/shunt stubs. The principle of achieving such high-quality circuits is detailed and is also confirmed by theoretical and experimental results, which are in reasonable agreement up to at least 70 GHz. The paper also presents a family of novel topologies of slow wave bandpass filters based on the proposed capacitively loaded CPW series/shunt stubs.

Keywords

CPWSiGeCMOSFiltersStubsCapacitive loadingSlow wave
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 2 , Special Issue 3-4: European Microwave Week 2009 , August 2010 , pp. 255 - 262
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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References

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