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|Title:||Bandwidth improvement of reflectarrays using single-layered double concentric circular ring elements on a subwavelength grid||Authors:||Guo, L.
double circular ring element
|Issue Date:||Feb-2014||Citation:||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|
|Appears in Collections:||Staff Publications|
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