Isolation Enhancement in Compact MIMO Antenna Using Dual-Stub Loaded Resonator

This paper describes a compact MIMO antenna using a Stub Loaded Resonator (SLR) providing enhanced isolation between the radiating elements. The compactness is achieved by introducing slots at the edges and inside the patch antenna. The antenna is designed such that the resonant frequency is at 3.48 GHz. The edge to edge separation between the antenna elements is 4.4 mm (0.052λ
₀
). The SLR results in the improvement of the isolation between the radiating elements by 32 dB at the operating resonant frequency. The proposed antenna is fabricated and tested. The measured isolation at the resonant frequency is 48 dB. The measured peak gain at the resonant frequency is 2.34 dBi. The proposed antenna has a compact area of the antenna 0.61λ
₀
× 0.38λ
₀
, where λ
₀
being the free space wavelength at the resonant frequency.