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Multiplexers and their integration with crystal video receivers

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2 Author(s)
J. E. Dean ; Filtronic Components Ltd., Shipley, UK ; M. J. Thornton

Broadband, highly selective, low-loss contiguous multiplexers have been developed in the form of suspended-substrate-stripline (SSS) devices. These multiplexers can have channel bandwidths covering at least an octave (up to a decade for the lowest-frequency channel) with a passband insertion loss less than 1 dB and stopband attenuations greater than 60 dB within only 5% of the crossover frequencies. Moreover, these devices can be made extremely thin and lightweight; typically, a diplexer covering an octave band per channel weighs less than 15g. The suspended-substrate-stripline approach enables the direct integration of other microwave components onto the substrate to produce complete high-performance subsystems. A DC-coupled crystal log video receiver weighing only 230 g and enclosed in a 7.5 in3 box has been produced to cover the bands 4¿¿8, 8¿¿12 and 12¿¿18 GHz using the above ideas.

Published in:

Communications, Radar and Signal Processing, IEE Proceedings F  (Volume:129 ,  Issue: 3 )