Please use this identifier to cite or link to this item: https://doi.org/10.1002/mop.28111
Title: Bandwidth improvement of reflectarrays using single-layered double concentric circular ring elements on a subwavelength grid
Authors: Guo, L. 
Tan, P.-K.
Chio, T.-H. 
Keywords: broadband
double circular ring element
pyramidal horn
reflectarray
subwavelength
Issue Date: Feb-2014
Source: Guo, L., Tan, P.-K., Chio, T.-H. (2014-02). Bandwidth improvement of reflectarrays using single-layered double concentric circular ring elements on a subwavelength grid. Microwave and Optical Technology Letters 56 (2) : 418-421. ScholarBank@NUS Repository. https://doi.org/10.1002/mop.28111
Abstract: This article proposes the use of double concentric circular ring elements arranged in a subwavelength grid on a single layer of substrate, in an effort to increase the bandwidth of reflectarrays. Compared to the traditional λ/2 grid arrangements, radiating elements arranged in subwavelength grids achieves a more similar behavior over wider frequency bands when radiating elements' parameters are varied; albeit with a smaller reflected phase range. Furthermore, in contrast to conventional subwavelength single-patch designs that have only one variable parameter of the phasing element, the double concentric circular ring elements also allow additional degrees-of-freedom to improve the bandwidth. Based on the concentric ring element, two offset-fed 0.43 × 0.43 m 2 reflectarrays, one with λ/2 grid and another with λ/3 grid, centered at 10 GHz are designed and developed. The measured results show that the 2-dB gain bandwidth of the one with λ/2 grid spacing is 13.6%, whereas the one with λ/3 grid spacing is 24.4%. © 2014 Wiley Periodicals, Inc.
Source Title: Microwave and Optical Technology Letters
URI: http://scholarbank.nus.edu.sg/handle/10635/128908
ISSN: 08952477
DOI: 10.1002/mop.28111
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