A compact microstrip crossover using NRI-TL metamaterial lines

Muhammad Ali Babar Abbasi*, Marco A. Antoniades, Symeon Nikolaou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)
272 Downloads (Pure)


A practical implementation of a miniaturized crossover is presented using negative-refractive-index transmission-line (NRI-TL) metamaterial lines. NRI-TL metamaterial theory has demonstrated that by loading a conventional transmission line with lumped LC elements, a large phase shift per-unit-length can be achieved. Employing this technique, the conventional microstrip transmission lines in a three-section branch-line coupler crossover are replaced with 90° NRI-TL lines, and thus a compact NRI-TL crossover with an area 47 times smaller than the area of its conventional counterpart is demonstrated. Measured results demonstrate that the proposed NRI-TL metamaterial crossover exhibits a −10 dB |S11| bandwidth of 33% and a |3 dB| |S31| bandwidth of 26% around 1 GHz.

Original languageEnglish
Number of pages4
JournalMicrowave and Optical Technology Letters
Early online date02 Oct 2018
Publication statusEarly online date - 02 Oct 2018


  • crossover coupler
  • hybrid coupler
  • metamaterial
  • Negative-refractive-index transmission-line (NRI-TL)

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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