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Compact ultrathin linear graded index metasurface lens for beam steering and gain enhancement
Author(s) -
Singh Amit K.,
Abegaonkar Mahesh P.,
Koul Shiban K.
Publication year - 2020
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.22186
Subject(s) - radiator (engine cooling) , optics , lens (geology) , beam steering , antenna gain , materials science , side lobe , beam (structure) , antenna (radio) , radiation pattern , conical surface , planar , optoelectronics , antenna aperture , physics , engineering , electrical engineering , computer science , composite material , computer graphics (images)
In this article, designing of a low‐profile planar linear graded index metasurface (LGIMS) lens is presented. A wide‐beam steerable high‐gain low‐profile antenna is designed by placing LGIMS over microstrip patch antenna radiator at an optimum height. Direction control of the radiation pattern of the microwave radiator by using amplitude and phase modulated metasurface is achieved. The measured peak gain of 13.50 dBi at an operating frequency of 10.08 GHz with progressively beam steering characteristic and progressive enhanced gain within a large conical region of apex angle 64°. The measured maximum gain tolerance of 2.43 dB with significantly reduced side lobe level is obtained by mechanically moving the ultrathin LGIMS lens along the negative parallel radiator axis. The mechanical movement of LGIMS lens over radiator results in to beam steering up to +32°. A maximum measured gain enhancement of 8.75 dB is achieved. The positive parallel radiator axis movement of LGIMS causes gradual broadside gain enhancement with maximum gain enhancement of 1.5 dB. The measured results are in good agreement with the simulated results.