Wideband, Low-Profile, Dual-Polarized Slot Antenna with an AMC Surface for Wireless Communications

A wideband dual-polarized slot antenna loaded with artificial magnetic conductor (AMC) is proposed for WLAN/WIMAX and LTE applications. The slot antenna mainly consists of two pairs of arrow-shaped slots along the diagonals of the square patch. Stepped microstrip feedlines are placed orthogonally to excite the horizontal and vertical polarizations of the antenna. To realize unidirectional radiation and low profile, an AMC surface composed of 7 × 7 unit cells is designed underneath a distance of ( being the wavelength in free space at 2.25 GHz) from the slot antenna. Both the dual-polarized slot antenna and the AMC surface are fabricated and measured. Experimental results demonstrate that the proposed antenna achieves for both polarizations a wide impedance bandwidth (return loss 10 dB) of 36.7%, operating from 1.96 to 2.84 GHz. The isolation between the two input ports keeps higher than 29 dB whereas the cross-polarization levels basically maintain lower than −30 dB across the entire frequency band. High front-to-back ratios better than 22 dB and a stable gain higher than 8 dBi are obtained over the whole band.

[1]  Zhenghe Feng,et al.  A Wideband Dual-Polarized Slot Antenna , 2013, IEEE Antennas and Wireless Propagation Letters.

[2]  Hau Wah Lai,et al.  Low Cost Dual Polarized Base Station Element for Long Term Evolution , 2014, IEEE Transactions on Antennas and Propagation.

[3]  Jun Wang,et al.  Wideband dual-polarised electromagnetic-fed patch antenna with high isolation and low cross-polarisation , 2013 .

[4]  Yong-Xin Guo,et al.  Wideband Dual-Polarized Patch Antenna With Broadband Baluns , 2007, IEEE Transactions on Antennas and Propagation.

[5]  D. Sievenpiper,et al.  High-impedance electromagnetic surfaces with a forbidden frequency band , 1999 .

[6]  M. Ciydem.  Isolation enhancement in wideband dual-polarised suspended plate antenna with modified T-type probes , 2014 .

[7]  D. Caratelli,et al.  Circuit model and near‐field behavior of a novel patch antenna for WWLAN applications , 2007 .

[8]  A A Serra,et al.  A Wideband Slot-Coupled Stacked-Patch Array for Wireless Communications , 2010, IEEE Antennas and Wireless Propagation Letters.

[9]  L. Shafai,et al.  Application of combined electric- and magnetic-conductor ground planes for antenna performance enhancement , 2008, Canadian Journal of Electrical and Computer Engineering.

[10]  Yingzeng Yin,et al.  Design of a Low-Profile Dual-Polarized Stepped Slot Antenna Array for Base Station , 2016, IEEE Antennas and Wireless Propagation Letters.

[11]  Quan Xue,et al.  A Differentially-Driven Dual-Polarized Magneto-Electric Dipole Antenna , 2013, IEEE Transactions on Antennas and Propagation.

[12]  A. Sambell,et al.  Dual-polarized broad-band microstrip antennas fed by proximity coupling , 2005, IEEE Transactions on Antennas and Propagation.

[13]  Kin-Lu Wong,et al.  Broad-band dual-polarized single microstrip patch antenna with high isolation and low cross polarization , 2002 .

[14]  Kwai-Man Luk,et al.  Dual Polarized Patch Antenna Fed by Meandering Probes , 2007, IEEE Transactions on Antennas and Propagation.

[15]  Ying Liu,et al.  A Novel Miniaturized Broadband Dual-Polarized Dipole Antenna for Base Station , 2013, IEEE Antennas and Wireless Propagation Letters.

[16]  Zhi-Ya Zhang,et al.  Dual-Polarized Crossed Bowtie Dipole Array for Wireless Communication Applications , 2014 .

[17]  Kwai-Man Luk,et al.  Broadband dual polarization patch element for cellular-phone base stations , 2002 .

[18]  Yu Luo,et al.  Oriental Crown-Shaped Differentially Fed Dual-Polarized Multidipole Antenna , 2015, IEEE Transactions on Antennas and Propagation.