Realization of multi-band 3-db branch-line couplers using Fourier-based transmission line profiles

K. A. Shamaileh, M. J. Almalkawi, V. K. Devabhaktuni, N. I. Dib, S. Abushamleh

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A new procedure for the design of multi-band branch-line couplers utilizing microstrip non-uniform transmission lines with Fourier-based profiles is presented in this article. The general method is accomplished by replacing the quarter-wave uniform transmission lines of a conventional coupler with multi-band non-uniform transmission lines of the same lengths, without including additional transmission lines or matching networks. The design of non-uniform transmission line couplers is performed using even- and odd-mode analysis. The proposed structure is relatively simple and is fabricated on a single-layered microstrip board. Two design examples of dual- and triple-band branch-line couplers suitable for global system mobile (GSM), wireless local area networks, and WiFi communications are designed, fabricated, and experimentally evaluated to validate the proposed methodology.

Original languageEnglish (US)
Pages (from-to)128-140
Number of pages13
Issue number2
StatePublished - Feb 17 2014
Externally publishedYes


  • Fourier
  • branch-line coupler
  • microstrip
  • multi-band 3-dB couplers
  • non-uniform transmission line

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Electrical and Electronic Engineering


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