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A compact planar triple band circularly polarized (CP) antenna loaded with parasitic elements is proposed for wireless applications. For achieving circular polarization 2 inverted L-shaped strips are added to the longer arm of dual band monopole and ground plane. A rectangular patch and a U shaped radiator are added to increase the impedance bandwidth as well as polarization purity. Electrical size of the antenna is 0.32λ × 0.32λ, where λ is the free space wavelength at its lowest CP frequency that is, 2.4 GHz. The structure shows an impedance bandwidths (│S 11 │ ≤ -10 dB) of 870 MHz (1.83-2.7 GHz), 1.17 . The 3-dB axial ratio bandwidths of the proposed structure are 12.2%, 5.3%, and 4.28% at 2.375, 3.47, and 4.9 GHz of center frequencies respectively. The proposed structure is fabricated and its parameters are measured. Measured results nearly match with the simulated results and it shows satisfactory gain in all the three operating CP bands.

An eight-element wideband multiple-input multiple-output (MIMO) antenna for the fifthgeneration (5G) mobile terminal is proposed. The antenna elements are placed along both long side edges of the mobile terminal with a profile of 6 mm. The proposed monopole-inspired antenna element shows a good impedance match, isolation, and diversity parameter across a very wide bandwidth of 78 % (3.2-7.3 GHz), and it can cover the 5G NR n77/n78/n79/n96, LTE 46, and WLAN 5 GHz bands. The result shows that the MIMO antenna can offer inter-element isolation better than 12 dB, envelope correlation coefficient (ECC) below 0.069, and a peak channel capacity of 42.7 bps/Hz across the desired 5G bands. The specific absorption rate (SAR) analysis of the proposed MIMO antenna with a human head has exhibited SAR levels (0.41 W/Kg and 0.33 W/Kg at two resonating frequencies 3.9 GHz and 5.8 GHz, respectively) much lower than the Federal Communications Commission (FCC) permissible limit (1.6 W/Kg over 1 gram tissue).INDEX TERMS 5G mobile, MIMO antenna, specific absorption rate (SAR), sub-6 GHz, wideband.

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