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Original Articles

Coplanar waveguide fed multiple input multiple output antenna with higher isolation and multi-sense circular polarization

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Pages 685-694 | Received 27 Apr 2017, Accepted 03 Nov 2017, Published online: 18 Dec 2017
 

Abstract

A coplanar waveguide (CPW)-fed multiple input multiple output (MIMO) antenna with higher isolation and multi-bandwidth circular polarization (CP) is presented. This antenna covers the impedance operations from 2.2 to 6.8 GHz with  < −10 dB,  < −14 dB and  < −10 dB. Employing two orthogonally placed T-shaped patches (TSP) and three L-shaped parasitic patches (LSPP) in the ground, the dual sense CP in the frequency band between 2.28 and 3.48 GHz (42.5%) and meanwhile between 6.03 and 6.28 GHz (4.1%) can be achieved when the left port (port_1) is excited, while the down port (port_2) is terminated by a 50 Ω load. When Port_2 is excited and port_1 is terminated by a 50 Ω load, the CP of the antenna in frequency band from 1.75 to 2.1 GHz (18.2%). On the other hand, CP from 4 to 4.47 GHz (11.1%) and 5.1 to 5.22 GHz (2.3%) can be obtained while both ports are excited. The CP frequency band covers the frequency bands for LTE (between 1.71 and 2.17 GHz), the WCDMA (between 1.92 and 2.17 GHz), the WiMax (between 2.3 and 2.5 GHz) and the WLAN. Meanwhile, the slot between these two TSP in the ground enhances the isolation of the proposed antenna. The measured and the simulated results are agreed with each other.

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