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Rotman lens design and optimization for 5G applications

Published online by Cambridge University Press:  26 June 2018

S. E. Ershadi ,
A. Keshtkar ,
A. Bayat ,
A. H. Abdelrahman  and
H. Xin
S. E. Ershadi*
Affiliation:
Electrical Engineering Department, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin 34148-96818, Iran
A. Keshtkar
Affiliation:
Electrical Engineering Department, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin 34148-96818, Iran
A. Bayat
Affiliation:
Electrical Engineering Department, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin 34148-96818, Iran
A. H. Abdelrahman
Affiliation:
Department of Electrical, Computer, and Energy Engineering, University of Colorado Boulder, Boulder, CO 80309-0425, USA
H. Xin
Affiliation:
Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721-0104, USA
*
Author for correspondence: S. E. Ershadi, E-mail: [email protected]
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Abstract

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.

Keywords

5Gantenna designmicrowave measurementsmodeling and measurements
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Issue 9 , November 2018 , pp. 1048 - 1057
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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