Abstract
This paper presents and implements a four-element modified L-shaped multiport antenna for sub-6 GHz applications. The isolation between the antenna elements is improved by careful engineering in the ground plane. The proposed four-element modified L-shaped MIMO antenna has a footprint of 0.21897 λ02, where, λ0 is the wavelength of the lowest operating frequency. The fractional bandwidth of this antenna is 55.15% while operating between 3.9–6.87 GHz. The inter-element isolation is always above 16 dB in simulation and above 18 dB in measurements, with the simulated peak gain of 2.53 dBi over its operating frequency band. The measured Envelope Correlation Coefficient (ECC) is below 0.008 which makes it a potential candidate for IEEE 802.11a and sub-6 GHz wireless applications requiring compact and low-profile antennas with high inter-element isolation.
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