In this paper, we present an innovative method of cross-polarisation suppression by forming the antennas in a so called Clover Array (CA). Such structure enables usage of polarisation diversity even for UWB systems. The simplified theoretical model of operation is presented as well as exemplary results of crosspolarisation patterns. The theory was verified for CA of planar Volcano-Smoke antennas. For fabricated array the cross-polarisation in main beam is below -14 dBi in the whole FCC-UWB frequency range (3.1 GHz - 10.6 GHz).
2. Adamiuk, G., T. Zwick, and W. Wiesbeck, "Dual-orthogonal polarized vivaldi antenna for ultra wideband applications," XVII International Conference on Microwaves, Radar and Wireless Communications, 282-285, 2008.
3. Kraft, U. R., "Main-beam polarization properties of four-element sequential-rotation arrays with arbitrary radiators," IEEE Transaction on Antennas and Communication, 515-52, 1996.
4. Ludwig, A. C., "The definition of cross polarisation," IEEE Transaction on Antennas and Communication, 116-119, 1973.
5. Powell, J. and A. Chandrakasan, "Differential and single ended elliptical antennas for 3.1-10.6 GHz ultra wideband communication," IEEE Antennas and Propagation Society International Symposium, 2935-2938, 2004.
6. Pancera, E., C. Sturm, and W. Wiesbeck, "Small UWB coplanar monopole antenna design," 2nd European Conference on Antennas and Propagation, EuCAP, 2007.
7. Yeo, J., Y. Lee, and R. Mittra, "Wideband slot antennas for wireless communications," IEE Proceedings Microwaves, Antennas and Propagation, Vol. 151, No. 4, 351-355, 2004.
8. Pancera, E., C. Sturm, and W. Wiesbeck, "UWB out-of-phase network feeding a 2-element impulse radiating array," IEEE Antennas and Propagation Society International Symposium, 2008.