Through a common set of analogue coefficients and a simple digital coding scheme in the form of ones and minus ones, a previous technique can only multiplex two beams whose directions satisfy a fixed relationship. In this work, two novel designs are proposed, which together with the corresponding inter-subarray coding schemes, can achieve multi-beam multiplexing for arbitrary directions to serve corresponding users. In the first design, based on the relationship of directions between the two required beams, the adjacent antenna spacing is regarded as a variable to be determined, while in the second design, the adjacent antenna spacing is fixed and an alternate optimisation procedure is proposed to solve the problem based on a least-square formulation. Designed examples based on uniform linear arrays and uniform planar arrays are provided to demonstrate the effectiveness of the proposed methods.
Bibliographical noteFunding Information:
Manuscript received February 16, 2020; revised May 28, 2020 and July 2, 2020; accepted July 5, 2020. Date of publication July 10, 2020; date of current version October 22, 2020. The review of this article was coordinated by Dr. C. Yuen. This work was partially supported by the U.K. Engineering and Physical Sciences Research Council (No. EP/T517215/1). (Corresponding author: Wei Liu.) Junwei Zhang and Wei Liu are with the Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S13JD, U.K. (e-mail: firstname.lastname@example.org; email@example.com).
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- adjacent antenna spacing
- arbitrary directions
- beam multiplexing
- inter-subarray coding
- Interleaved subarray architecture
ASJC Scopus subject areas
- Automotive Engineering
- Aerospace Engineering
- Electrical and Electronic Engineering
- Applied Mathematics