Rotman lens design and optimization for 5G applications

S. E. Ershadi, A. Keshtkar, A. Bayat, A. H. Abdelrahman, Hao Xin

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The next generation of wireless networks (5G) employs directional transmission at millimeter wave (mmW) frequencies to provide higher bandwidth and faster data rates. This is achieved by applying antenna arrays with proper beam steering capabilities. Rotman lens has long been used as a lens-based beamformer in electronically scanned arrays and its efficient design is important in the overall performance of the array. Minimizing the phase error on the aperture of the antenna array is an important design criterion in the lens. In this paper, a 7 × 8 wideband Rotman lens is designed. Particle swarm optimization is applied to minimize the path length error and thereby the phase error. The optimized lens operates from 25 to 31 GHz, which covers the frequency bands proposed by the Federal Communications Commission for 5G communications. The proposed optimized lens shows a maximum phase error of <0.1°. The proposed Rotman lens is a good candidate to be integrated with wideband microstrip patch antenna arrays that are suitable for 5G mmW applications.

Original languageEnglish (US)
Pages (from-to)1048-1057
Number of pages10
JournalInternational Journal of Microwave and Wireless Technologies
Issue number9
StatePublished - Nov 1 2018


  • 5G
  • antenna design
  • microwave measurements
  • modeling and measurements

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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