A 4 × 4 Butler matrix optimized for umts applications

Theodores N. Kalfas, John N. Sahalos

Research output: Contribution to journalArticlepeer-review


A 4 × 4 Butler matrix (BM) optimized for UMTS applications is presented. Special care is taken for the design of the elliptic couplers and the line crossovers. The BM is fabricated by conventional photolithography on a single laminate. No expensive double layer/multi-layer or high permittivity substrates or high-temperature superconductors are used. The design is compact and complies with the bandwidth specifications of the UMTS band.

Original languageEnglish
Pages (from-to)585-588
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number3
Publication statusPublished - Mar 2007


  • Butler matrix
  • Directional coupler
  • Lange coupler
  • Smart antennas


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