Low-profile, extremely wideband, dual-band-notched MIMO antenna for UWB applications

In this article, an extremely wideband, isolation-enhanced, low-profile “Multiple-Input-Multiple-Output” (MIMO) antenna along with dual-band-notched features has been investigated. The antenna proposed herein, possesses two mutually orthogonal staircase-etched radiators for achieving a wide bandwidt...

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Bibliographic Details
Published in:International journal of microwave and wireless technologies 2019-09, Vol.11 (7), p.719-728
Main Authors: Bhattacharya, Ankan, Roy, Bappadittya, Caldeirinha, Rafael F. S., Bhattacharjee, Anup K.
Format: Article
Language:English
Subjects:
Antenna Design, Modelling and Measurements
Antennas
Bandwidths
Decoupling
Design
Embedded systems
Frequencies
Ground plane
Local area networks
Mutual coupling
Notches
Parasitic elements (antennas)
Propagation
Radiators
Researchers
Satellite communications
Slits
T shape
Ultrawideband
Wideband communications
Wireless networks
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Summary:In this article, an extremely wideband, isolation-enhanced, low-profile “Multiple-Input-Multiple-Output” (MIMO) antenna along with dual-band-notched features has been investigated. The antenna proposed herein, possesses two mutually orthogonal staircase-etched radiators for achieving a wide bandwidth. The radiating elements are placed mutually perpendicular in order to achieve polarization diversity and high isolation, i.e. for minimization of mutual coupling effect between adjacent radiating elements. The antenna exhibits an extremely wide frequency bandwidth covering 1.2–19.4 GHz except two frequency band notches centered at 3.5 and 5.5 GHz, respectively, originated due to the incorporation of a “Rectangular Complementary Split Ring Resonator (RCSRR)” structure and by etching dual “L-shaped” slits in the ground plane. The center frequency of the notched bands is adjusted by fine tuning of the dimensions of the incorporated band-notching structures. Isolation level (S21) better than −20 dB has been obtained due to the insertion of a “T-shaped” parasitic element as a decoupling structure. A prototype of the proposed antenna having dimension of 20 mm × 20 mm (0.08 λo × 0.08 λo) is fabricated and the antenna responses have been measured. Obtained results show that the miniaturized MIMO diversity antenna is undoubtedly a capable contender for communications supporting an extremely wide impedance bandwidth along with band-notched features for WLAN and WiMAX.
ISSN:1759-0787
1759-0795
DOI:10.1017/S1759078719000266