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Broadband compact CPW ‐fed metasurface antenna for SAR ‐based portable imaging system
Author(s) -
Cai Ming,
Li Xiaoqiang,
Fan Leming,
Yang Guangli,
Sharma Satish Kumar
Publication year - 2018
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21175
Subject(s) - coplanar waveguide , broadband , optics , bandwidth (computing) , ground plane , physics , center frequency , slot antenna , microstrip antenna , microwave , antenna (radio) , computer science , telecommunications , band pass filter , quantum mechanics
Abstract A broadband and compact coplanar waveguide (CPW) coupled‐fed metasurface (MS)‐based antenna for C‐band synthetic aperture radar (SAR) imaging application is proposed in this article, which is consisted of 16 uniform periodic square patches performed as radiators. The CPW feeding structure gives two following functions: (1) It excites an aperture coupling slot structure underneath the center of MS patch array. (2) It acts as a ground plane for the metasurface patch units. Different slots were investigated and eventually an hourglass‐shaped slot is applied to enhance bandwidth for imaging applications. A prototype with a dimension of 60 × 60 × 1.524 mm 3 (1.1λ 0 × 1.1λ 0 × 0.03λ 0 ) operating at the center frequency 5.5 GHz ( f 0 ) has been fabricated and measured to verify the design principle. This antenna has a measured impedance bandwidth of 12.4% from 5.14 to 5.82 GHz, a peak gain of 9.2 dBi and averaged gain of 7.2 dBi at broadside radiation. Microwave imaging experiments using the proposed antenna have been carried out and a good performance is achieved.