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This article presents, an ACS-fed compact Trophy shaped four-port multiband MIMO antenna system for various wireless applications namely 2.3 GHz WiBro, WiMAX, and WLAN respectively. The proposed MIMO antenna structure has been etched on a cost affordable FR-4 substrate (εr = 4.4 and loss tangent = 0.02) with dimensions of 50 × 50 × 1.6 mm3. Mutual coupling reduction between the radiators has been achieved by placing the elements orthogonal to each other. With all these arrangements the ACS MIMO system operates with a peak gain of 4 dB with minimum isolation below − 17 dB. The proposed antenna operates in the frequency bands of (2.25–2.42, 3.36–3.72, 5.0–6.5) GHz with an ECC < 0.001 and channel capacity loss < 0.4 bps/Hz. Various parameters like DG, TARC, MEG, which are used to check diversity performance have been calculated and presented in the article. [ABSTRACT FROM AUTHOR]

This article discusses a 4-port micro-strip fed MIMO Antenna system with a triangular slot and an inverted L shape strip has been designed and analysed for both 2.3 GHz WiBro and Ultra-wide-band applications. The suggested antenna has been etched on a cost-effective epoxy (FR-4) substrate having ϵ r ${{\epsilon}}_{r}$ = 4.4 with an overall dimension of 45 × 45 × 1.6 mm3. Mutual coupling of −18 dB between the radiators has been obtained by orthogonal placement of radiators. From the simulated and practical results, the proposed compact MIMO system operates in frequency bands 2.26–2.42 GHz and 3.7–10.8 GHz respectively. The proposed small triangular MIMO system operates with an ECC less than 0.005 with an acceptable channel capacity loss <0.5 bits/s/Hz. Further, the diversity characteristics like DG, MEG, TARC, and group delay have been calculated and are presented in this paper. [ABSTRACT FROM AUTHOR]