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Design of a novel X-band waveguide diplexer based on cross-coupled resonators

Design of a novel X-band waveguide diplexer based on cross-coupled resonators

Shang, Xiaobang, Xia, Wenlin, Wang, Yi and Lancaster, Michael J. (2012) Design of a novel X-band waveguide diplexer based on cross-coupled resonators. In: 5th International Workshop on Microwave Filters, 1-3 Oct 2012, CNES, Toulouse, France. (Unpublished)

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A microwave diplexer is a three-port component, which is usually employed in a communication system to split input signals from a common port into two channels operating at different centre frequencies. The common approach to synthesis a diplexer is to design each channel filter individually and then to design a distribution network to combine these two separated channels. In [1-2], we have proposed a coupled-resonator based diplexer structure that eliminates the need of separate common junctions for the distribution of energy. This leads to a significant reduction in diplexer size and volume. The design approach of this type of diplexer is based on synthesis of coupling matrices using a gradient-directed optimisation. To obtain desired quasi-elliptic filtering responses for a specified channel, cross couplings need to be introduced at corresponding branch to generate transmission zeros. In this work, we demonstrate a novel multiplexer design with two transmission zeros. These two transmission zeros are shared by both channels, and are generated by introducing a cross coupling between resonators in the main stem rather than adding a cross coupling to each separate branch. This alternative approach to produce transmission zeros for both channels simplifies the diplexer design procedure. The design is demonstrated in X-band waveguide.

Item Type: Conference or Conference Paper (Paper)
Additional Information: [1] This paper was first presented within Session 4: Waveguide, OMUX and High Power, on 2nd October 2012 at the 5th International Workshop on Microwave Filters held in Toulouse, France from 1-3 October 2012. The Workshop was co-organized by CNES (Centre National d’Etudes Spatiales) and ESA (European Space Agency).
Uncontrolled Keywords: waveguide diplexer
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Pre-2014 Departments: School of Engineering
School of Engineering > Mobile & Wireless Communications Research Laboratory
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Last Modified: 14 Oct 2016 09:26

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