Active diplexer based on isolation circuits imbedded low noise amplifiers

Hanseung Lee, Jun H. Choi, Tatsuo Itoh

Research output: Chapter in Book/Entry/PoemConference contribution

3 Scopus citations


In this paper, a novel active diplexer based on low-noise amplifiers (LNAs) using multi-functional composite right/left-handed input matching circuit (CRLH-IMC) is proposed. Since each CRLH-IMC has optimized impedance for targeted LNA performances as well as the required isolation characteristics, an active diplexer with gain and low noise figure (NF) can be realized by placing a single input port between two LNAs with CRLH-IMCs. The proposed active diplexer can reduce overall system dimension and loss by removing passive diplexer. In addition, diplexer performances such as insertion loss and isolations can now be controlled by an amplifier design. In this paper, the active diplexer prototype operating at 1.5 GHz and 2.6 GHz is designed and fabricated. The measured results show good agreement with the simulated results.

Original languageEnglish (US)
Title of host publicationEuropean Microwave Week 2015: "Freedom Through Microwaves", EuMW 2015 - Conference Proceedings; 2015 45th European Microwave Conference Proceedings, EuMC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Print)9782874870392
StatePublished - Dec 2 2015
Event45th European Microwave Conference, EuMC 2015 - Paris, France
Duration: Sep 7 2015Sep 10 2015


Other45th European Microwave Conference, EuMC 2015


  • Composite right/left handed (CRLH)
  • diplexer
  • isolation circuit
  • low noise amplifier (LNA)

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Radiation


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