Complementary diplexer

A contiguous planar diplexer in suspended stripline(SSL) technology is used in this article. The design of the diplexer is based on quasi-complementary LC lowpass and bandpass prototypes which are directly transformed into transmission line elements by using a quasi -lumped approach. This very straightforward design procedure requires no susceptance annulling networks and no introduction of unit elements which could limit the diplexer's operation bandwidth. For achieving an optimal compatibility with external circuits, an ultra-broadband suspended stripline - microstrip line transition with a return loss of more than 10 dB from DC to 5 GHz was designed with very low channel insertion losses of typically less than 1 dB. The realized diplexer is extremely compact (63.5×14.9mm). This diplexer works at DC to 5GHz. The lowpass filter's transmission band is from DC to 3GHz and the bandpass filter's transmission band is from 4GHz to 5GHz.

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