Journal
WIRELESS PERSONAL COMMUNICATIONS
Volume 92, Issue 3, Pages 1029-1038Publisher
SPRINGER
DOI: 10.1007/s11277-016-3590-4
Keywords
Planar slotted antennas; Metamaterial; Composite right/left handed transmission-lines; UHF-SHF bands; RF circuits; Microwave devices; Wireless comunications systems
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Two novel planar slotted-antennas (PSAs) are presented that exhibit good radiation characteristics at the UHF-SHF bands. The proposed antennas are constructed using metamaterial unit-cells constituted from capacitive slots etched in the radiating patch and grounded spiral shaped inductive stubs. The proposed PSA design is fabricated on a commercially available dielectric substrate, i.e. Rogers RO4003 with permittivity of 3.38 and thickness of 1.6 mm. The first PSA comprising five symmetrical unit-cells of slot-inductor-slot configuration operates over a wide bandwidth extending from 1 to 4.2 GHz with a peak gain of 1.5 dBi and efficiency of 35 % at 2 GHz. The second PSA consists of ten asymmetrical unit-cells of slot-inductor configuration on the same size of substrate as the first PSA, enhances the antenna gain by 2 dB and efficiency by 25 % and operates over 0.75-4.5 GHz. The asymmetrical unit-cell effectively increases the aperture size of the antenna without comprising its size. The electrical size of the antenna is 0.083 lambda(0) x 0.033 lambda(0) x 0.005 lambda(0), where free-space wavelength (lambda(0)) is 1 GHz.
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