• Design of 2x2 U-shape MIMO slot antennas with EBG material for mobile handset applications.

      Abidin, Z.Z.; Ma, Y.; Abd-Alhameed, Raed A.; Ramli, Khairun N.; Zhou, Dawei; Bin-Melha, Mohammed S.; Noras, James M.; Halliwell, Rosemary A. (22/03/2011)
      A compact dual U-shaped slot PIFA antenna with Electromagnetic Bandgap (EBG) material on a relatively low dielectric constant substrate is presented. Periodic structures have found to reduce mutual coupling and decrease the separation of antenna and ground plane. A design with EGB material suitable for a small terminal mobile handset operating at 2.4 GHz was studied. Simulated and measured scattering parameters are compared for U-shaped slot PIFA antenna with and without EBG structures. An evaluation of MIMO antennas is presented, with analysis of the mutual coupling, correlation coefficient, total active reflection coefficient (TARC), channel capacity and capacity loss. The proposed antenna meets the requirements for practical application within a mobile handset.
    • Loop feed meander-line antenna RFID tag desing for UHF band

      Ma, Y.; Abd-Alhameed, Raed A.; Zhou, Dawei; See, Chan H.; Abidin, Z.Z.; Jin, C.; Peng, B. (2014)
      A loop feed meander-line Antenna (LFMLA) RFID tag on a relatively low dielectric constant substrate operates on the European UHF band 865-868 MHz is presented. The tag modeling is analyzed using two different electromagnetic simulator HFSS and CST. A prototype tag antenna is constructed and measured for validation. The input impedance of the proposed antenna is verified against the simulated data results, the measured and simulated results are found to be in good agreement. The compact size tag antenna shows excellent impedance matching to the typical input impedance of a RFID integrated circuit chip and a significant improvement in reading range up to 5 meters.
    • Minimization of Mutual Coupling Using Neutralization Line Technique for 2.4 GHz Wireless Applications

      Marzudi, W.N.N.W.; Abidin, Z.Z.; Muji, S.Z.M.; Ma, Y.; Abd-Alhameed, Raed A. (2015)
      This paper presented a planar printed multiple-input-multiple-output (MIMO) antenna with a dimension of 100 x 45 mm2. It composed of two crescent shaped radiators placed symmetrically with respect to the ground plane. Neutralization line applied to suppress mutual coupling. The proposed antenna examined both theoretically and experimentally, which achieves an impedance bandwidth of 18.67% (over 2.04-2.46 GHz) with a reflection coefficient < -10 dB and mutual coupling minimization of < -20 dB. An evaluation of MIMO antennas is presented, with analysis of correlation coefficient, total active reflection coefficient (TARC), capacity loss and channel capacity. These characteristics indicate that the proposed antenna suitable for some wireless applications.