Mutual-Coupling Compensation in Time-Modulated Antenna Arrays for Flat-Top Pattern Synthesis

Authors: Li, Gang; Yang, Shiwen; Wang, Guichang; Nie, Zaiping

Source: Electromagnetics, Volume 29, Number 6, August 2009 , pp. 499-507(9)

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Abstract:

A method that can be used to compensate for the mutual-coupling effect in time-modulated antenna arrays for synthesizing flat-top patterns is proposed in this article. Based on the measured complex embedded element patterns, the differential evolution algorithm is employed to optimize time sequences and phase excitation of each element in the array and to suppress the sideband level, leaving the amplitude excitations to be uniform. A -20-dB sidelobe level flat-top pattern is successfully synthesized in which the ripple level of the mainlobe is lower than 0.5 dB and the sideband level is lower than -10 dB. An S-band eight-element printed dipole with a double-layered structure linear array is used in the experiment to verify the proposed method, and the measured results are in good agreement with the simulated results.

Keywords: antenna arrays; time modulation; mutual coupling; differential evolution

Document Type: Research article

DOI: http://dx.doi.org/10.1080/02726340903098613

Affiliations: 1: Department of Microwave Engineering, School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, P.R. China

Publication date: 2009-08-01

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