New CRLH-based planar slotted antennas with helical inductors for wireless communication systems, RF-circuits and microwave devices at UHF–SHF bands

Alibakhshikenari, Mohammad, Naser-Moghadasi, Mohammad, Sadeghzadeh, Ramazan Ali, Virdee, Bal Singh and Limiti, Ernesto (2016) New CRLH-based planar slotted antennas with helical inductors for wireless communication systems, RF-circuits and microwave devices at UHF–SHF bands. Wireless Personal Communications, 92 (3). pp. 1029-1038. ISSN 0929-6212

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Abstract / Description

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 0.083λo × 0.033λo × 0.005λo, where free-space wavelength (λo) is 1 GHz.

Item Type:	Article
Uncontrolled Keywords:	Planar slotted antennas; Metamaterial; Composite right/left handed transmission-lines; UHF–SHF bands; RF circuits; Microwave devices; Wireless communications systems
Subjects:	600 Technology > 620 Engineering & allied operations
Department:	School of Computing and Digital Media
Depositing User:	Bal Virdee
Date Deposited:	20 Jan 2017 09:33
Last Modified:	17 Apr 2020 15:38
URI:	https://repository.londonmet.ac.uk/id/eprint/1175

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