A compact four-element electromagnetic band gap and slots-inspired ultra-wideband multiple-input-multiple-output antenna with quad-band rejection characteristics
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Abstract
In this research, a four-element multiple-input-multiple-output (MIMO) antenna with ultra-wideband (UWB) operating range and quad-notch characteristics at WLAN (4.7-5.9 GHz), X-band uplink and downlink satellite systems (6.6-8.1 GHz), X-band NATO type-2 spectrum (8.6-10.96 GHz), and Ku-band fixed satellite services (FSS) and direct broadcast satellite (DBS) services (11.6-12.9 GHz) is designed on the FR-4 substrate of dimensions of 0.28λ0 × 0.32λ0 × 0.01λ0 (28 mm × 36 mm × 1 mm). In order to attain inter-element isolation of more than 20 dB, a pair of inverse-L stubs is introduced in the common ground plane of the proposed antenna. Additionally, good radiation characteristics with a maximum gain of 5.6 dBi and diversity parameters have been analyzed with envelope correlation coefficient (ECC < 0.001), diversity gain (DG > 9.5 dB), mean effective gain (MEG ≤ -3 dB), and total active reflection coefficient (TARC < -10 dB). The measured and simulated results of the proposed MIMO antenna, operating from 3.1 to 15.2 GHz, validate that it is a good choice for wireless communication applications.
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