A transmitting lens antenna with focused beams by employing four-layer phase-gradient metasurface (PGMS) is proposed. A wideband slot-coupled antenna is mounted close to the focal position of the PGMS acting as a feed. The electromagnetic wave radiated through the feed source is transformed to plane wave within a wide frequency covering from 9.4 to 10.6 GHz. The in-band measured gain is from 16.7 to 19.4 dBi and a 3-dB gain bandwidth of around 10% is achieved, which demonstrates that the proposed four-layer PGMS still has the ability to focus electromagnetic wave within a wide frequency band efficiently though its transmission phase range at some specific frequency bands does not meet 360 •. INDEX TERMS Wideband, transmitting, slot-coupled antenna, phase-gradient metasurface.
A compact dual-band dual-polarized log-periodic dipole array with a dimension of 160×160×60 mm 3 for MIMO WLAN applications is proposed. In this antenna, there are 12 antennas,six for horizontal polarization and six for vertical polarization.In order to achieve dual linear polarizations and beam switching ,six horizontal antennas are placed in sequential, rotating arrangement on a horizontal substrate panel with an equal inclination angle of 60 o to form a symmetrical structure, while the other six antennas for vertical polarization are inserted through slots made on the horizontal substrate panel. Futhermore, six pairs of double T-type slits are introduced to mainly reduce the mutual coupling between the horizontal antennas.The proposed array is manufactured and exhibits the characteristics of high isolation, good front-to-back ratio,and average gains of 5 and 6 dBi over the 2.4 and 5 GHz ban d,respectively.The MIMO performance of the array is analyzed and evaluated by mutual coupling and the envelope correlation coefficient.
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