Back-to-back microstrip antenna fed with tunable power divider

A microstrip antenna structure with pattern reconfigurable characteristics is described. The structure consists of two stacked patch antennas and a tunable feeding network. The two antennas are arranged by a back-to-back configuration, and they are respectively excited by the outputs of the 1-to-2 feeding network composed of a quasi-lumped coupler and two varactor diodes. With controlling the dc voltage of the varactors, the ratio of two outputs of the feeding network can be varied between 1 and 13 dB so that the radiation pattern generated by the two antennas is changed. A prototype operating at 2.45 GHz band is implemented and tested. Experimental results demonstrate that the radiation of the prototype in the H plane can be switched among omnidirection pattern and broadside patterns with various front-to-back ratios.

[1]  Sungjoon Lim,et al.  Monopole-Like and Boresight Pattern Reconfigurable Antenna , 2013, IEEE Transactions on Antennas and Propagation.

[2]  Dirk Heberling,et al.  Circularly Polarized Antenna With Steerable Dipole-Like Radiation Pattern , 2014, IEEE Transactions on Antennas and Propagation.

[3]  Philippe Ferrari,et al.  A compact three port power divider with tunable power ratio , 2013 .

[4]  Andrei Grebennikov,et al.  A novel variable power divider with continuous power division , 2013 .

[5]  M.Y.W. Chia,et al.  Wide-band L-probe fed circular patch antenna for conical-pattern radiation , 2004, IEEE Transactions on Antennas and Propagation.

[6]  Y. Guo,et al.  A Pattern Reconfigurable U-Slot Antenna and Its Applications in MIMO Systems , 2012, IEEE Transactions on Antennas and Propagation.

[7]  Kwok-Keung M. Cheng,et al.  A Frequency-Compensated Rat-Race Coupler With Wide Bandwidth and Tunable Power Dividing Ratio , 2013, IEEE Transactions on Microwave Theory and Techniques.

[8]  H. Iwasaki.  Slot-coupled back-to-back microstrip antenna with an omni- or a bi-directional radiation pattern , 1999 .

[9]  H. Iwasaki,et al.  Circularly polarised back-to-back microstrip antenna with an omnidirectional pattern , 1999 .

[10]  K.-K.M. Cheng,et al.  A Novel Power-Divider Design With Unequal Power-Dividing Ratio and Simple Layout , 2009, IEEE Transactions on Microwave Theory and Techniques.

[11]  K.M. Luk,et al.  A wide-band monopolar wire-patch antenna for indoor base station applications , 2005, IEEE Antennas and Wireless Propagation Letters.

[12]  Jeen-Sheen Row,et al.  Polarization reconfigurable microstrip patch antenna , 2013 .

[13]  Young Joong Yoon,et al.  Simple reconfigurable antenna with radiation pattern , 2008 .

[14]  Jinho Jeong,et al.  Reconfigurable 1:3 power divider using coupled lines , 2009 .