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A novel compact microstrip MIMO antenna with high isolation and low envelope correction coefficient has been proposed and presented in this paper. The proposed antenna is compact in size with 3.22x4.86 mm2, operating over the frequency band of 60GHz. The MIMO antennas have been designed andsimulated using electromagnetic design and verification platformIE3DTM. Two ports MIMO antenna with the size of 3.22x1.93 mm2 resonates at 58.1 GHz covering a band of 57-59.3 GHz, with the bandwidth of 2.3 GHz, gain of 5.2 dBi, and directivity of 8.67 dBi. It also provides aninput reflection coefficient of -18.41 dB with isolation of -19.98 dB. Proposed four port MIMO antenna resonates at 58 GHz covering a range of 56.9 GHz to 59.2 GHz, with a bandwidth of 2.3 GHz, gain of 5.44 dBi, and the directivity of 9.75dBi. It provides goodisolationranging from -19 dB to -30 dB with input reflection coefficient of -18.09 dB. The envelope correlation coefficient (ECC) of the proposed four-port MIMO antenna is below 0.06 in far-field radiation characteristics. The proposed MIMO antenna has been analyzed for its diversity performance in terms of ECC, mean effective gain, and diversity gain.

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Abstract:In this paper, analyses and design of slotted Rectangular patch antenna for high speed wireless local area network at 5-6 GHz frequency has been done. A parametric study of the antenna has been carried out, to analyze and understand the effects of dimensional parameters. Main disadvantage of the microstrip patch antenna is its narrow bandwidth. However, in this paper slotting technique has been used to increase the bandwidth of the patch antenna. In this design, four slots are incorporated into Rectangular patch antenna. It gives fractional bandwidth of 0.202% with the center frequency of 5.4345GHz & 0.334% with center frequency of 5.681GHz.The antenna frequency band, with -10 db return loss covers the frequency range of 5.431-5.442 &5.675-5.68 GHz. The design of patch antenna has been completed using IE3D software. The antenna is designed on 0.5mm RT duroid 5880 substrate with dielectric constant of 2.2 and loss tangent 0.0004 operating at 5.25 GHz. A substrate of low dielectric constant is selected to obtain a compact radiating structure that meets the demanding bandwidth specification.