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Predistortion technique for cross-coupled filters and its application to satellite communication systems

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6 Author(s)
Ming Yu ; COM DEV, Cambridge, Ont., Canada ; Wai-Cheung Tang ; Malarky, A. ; Dokas, V.
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This paper presents a novel adaptive predistortion technique for general cross-coupled microwave/RF filters with improved insertion loss and group-delay equalization. The method enables many potential applications of an almost abandoned technique, and permits a lower Q implementation technology to emulate the performance of a higher Q filter. 10-4-4 filters were built and tested at C- and Ku-band to verify the validity of the new method. The impact to satellite communication channels was also analyzed. Another novel concept of over-predistortion was proposed and evaluated and should lead to significant improvement for applications such as satellite transponder input multiplexers, where insertion loss can be traded off for in-band flatness, mass, volume, and even overall system performance.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:51 ,  Issue: 12 )