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An adaptive controllable monopole antenna with a frequency-selective reflector has been developed with a miniature planar structure for MIMO applications. Radiation patterns for the developed antenna could be successfully controlled by a loaded GaAs Shottkey-barrier diode varactor fabricated with a MMIC process. By increasing the capacitance value from 0.23[pF] to 0.43[pF], a measured gain at 2.5[GHz]...
Differential-mode dual-band antennas with frequency-selective scattering elements are demonstrated for MIMO applications. The input impedance of the small antenna is shown to be approximated with a cascade circuit of the antenna's conductor and the coupling with the free space. With the results, differential-mode dual-band antennas were designed. Satisfactory return losses and omni-directional radiation...
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