A high performance K-band diplexer using high-Q micromachined cavities

Michael J. Hill, John Papapolymerou, Richard W. Ziolkowski

Research output: Contribution to conferencePaperpeer-review

2 Scopus citations


Microwave diplexers are often used on transmit / receive systems to isolate a power transmit stage from a sensitive receive stage sharing a common antenna. With the ever-increasing need for efficient bandwidth usage, diplexers exhibiting close channel spacing, low insertion loss and small channel bandwidths are increasingly necessary. Utilizing two high Q cavity resonators, a Duroid-based high performance diplexer has been designed, fabricated and measured. This diplexer shows transmit / receive bandwidths of 2.39% and 1.8% and insertion losses of 2.38dB and 2.89dB, respectively. Channel center frequencies of 18.8GHz and 20.7GHz provide a channel separation of approximately 9% and channel to channel isolation greater than 24dB. Utilizing machined aluminum cavities and a Duroid substrate the diplexer design provides insight into cavity based diplexer construction, allowing for the design of a silicon based micromachined cavity diplexer. Simulation results from this silicon-based diplexer are also presented.

Original languageEnglish (US)
StatePublished - 2000
Event2000 30th European Microwave Conference, EuMC 2000 - Paris, France
Duration: Oct 2 2000Oct 5 2000


Other2000 30th European Microwave Conference, EuMC 2000


  • Cavity Resonator
  • Diplexer
  • K-Band

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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