Browsing by Author "Manirathnam, Chinthapalli"

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    Millimeter-Wave MIMO Antenna For 5G Application
    (Department of Electronics and Communication Engineering, NITS, 2022) Manirathnam, Chinthapalli
    A circularly polarized, two-port, multiple input and multiple output (MIMO) antenna having high gain for 5G wireless communication systems is proposed in this study. The proposed unit cell utilises a Microstrip patch antenna is made up of Rogers RT/Duroid 5880 substrate material, which has a loss tangent of 0.0009, a dielectric constant of 2.2, and a substrate thickness of 0.8 mm, with a full ground plane and H-shaped slot to obtain a resonant fre quency of 28 GHz in the millimeter-wave (mm-wave) region. The dimension of the designed patch antenna is 14 mm x 10 mm x 0.8 mm.To realize circular polarization in operating band width a cross-shaped slot is etched from its radiating patch. The circularly polarized antenna maintains an appropriate gain of 4.47 dB, the antenna has a larger operational bandwidth of 2.25 GHz and operates in the frequency range from 26.36 GHz to 28.61 GHz. Initially, to de sign MIMO configuration, the proposed single element antennas are conventionally arranged with an edge-to-edge separation of 0.7λ. The dimension of the designed MIMO system is 26 mm x 14 mm x 0.8mm. TheProposed MIMO antenna maintains an appropriate gain of 4.95 dB,both the antennas are resonating at 28 GHz frequency in the range of 27.16 GHz to 28.7 GHz having bandwidth of 1.54 GHz. Further to reduce the mutual coupling between radiating elements, meta material(MTM) based SRR is introduced in between two antennas. By using the SRR the isolation between antenna elements are improved by 10 dB at resonant frequency of 28 GHz. An artificial magnetic conductor (AMC) is placed under the MIMO antenna to enhance the gain of the system by about 75% over the operating frequency band. The dimension of the designed AMC based MIMO antenna is 36 mm x 36 mm. Initially The proposed AMC based MIMO antenna is verified by the simulation results in terms of S-parameters, isolation, gain, Axial ratio and MIMO diversity parameters. The isolation between two radiating elements is also significantly higher than 37 dB. The circularly polarized AMC based MIMO antenna maintains A high gain of 8.6 dB, the antenna has a bandwidth of 1.4 GHz and operates in the frequency range from 27.3 GHz to 28.7 GHz and the Axial ratio bandwidth is 1.52GHz in the operating band 26.86 GHz to 28.38 GHz. The proposed AMC based MIMO antenna system also features high diversity gain, low channel capacity loss, and good envelope correlation coefficient. Which makes the proposed AMC based MIMO antenna is suitable for 5G wireless communication systems.