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Design and Realization of a Dual-Mode Circular Waveguide Filter for Digital Audio Broadcasting (DAB) Applications

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4 Author(s)
Paolo Mezzanotte ; Istituto di Elettronica, Università di Perugia, Via G. Duranti, 93, I-06131 Perugia, Italy. Tel. +39-75-5852633, Fax +39-75-5852654, e-mail: ; Federico Alimenti ; Luca Roselli ; Sergio Sordi

DAB applications demand the realization of band-pass filters with very stringent characteristics. In this paper this requirements have been fulfilled by designing and realizing a four-pole elliptic transfer function by means of a Dual-Mode Circular Waveguide Filter (DMCWF). This design has been performed by adopting a conventional synthesis strategy. The most critical aspect of this structure, that is its difficult tunability, has been overcome by experimentally adjusting the filter dimensions following a CAD procedure extensively described in the paper.

Published in:

Microwave Conference, 1997. 27th European  (Volume:2 )

Date of Conference:

8-12 Sept. 1997