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A UWB Unidirectional Antenna With Dual-Polarization

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2 Author(s)
Biqun Wu ; State Key Laboratory of Millimeter Waves, Department of Electronic Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong ; Kwai-Man Luk

A novel ±45° dual-polarized unidirectional antenna element is presented, consisting of two cross center-fed tapered mono-loops and two cross electric dipoles located against a reflector for ultrawideband applications. The operation principle of the antenna including the use of elliptically tapered transmission line for transiting the unbalanced energy to the balanced energy is described. Designs with different reflectors-planar or conical-are investigated. A measured overlapped impedance bandwidth of 126% (SWR <; 2) is demonstrated. Due to the complementary nature of the structure, the antenna has a relatively stable broadside radiation pattern with low cross polarization and low back lobe radiation over the operating band. The measured gain of the proposed antenna varies from 4 to 13 dBi and 7 to 14.5 dBi for port 1 and port 2, respectively, over the operating band, when mounted against a conical backed reflector. The measured coupling between the two ports is below -25 dB over the operating band.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:59 ,  Issue: 11 )