In this paper, we discuss the impedance and radiation properties of planar UWB (any ultra wide frequency band) dual-polarized antennas. While their performance is usually defined using the impedance bandwidth, some applications require pattern stability over broad frequency bands. An analysis of the behaviour of three UWB dual-polarized antennas (Bowtie Antenna, Toothed Log-Periodic Antenna and Sinuous Antenna) showed interesting conclusions in terms of impedance matching bandwidth and radiation pattern steadiness. Starting from there, we then developed a method that consists in meandering the original structure. This method allows for miniaturization as well as radiation bandwidth enhancement. As a final result, an electrically small antenna with an impedance bandwidth of more than a decade and a steady radiation pattern over it has been developed.
2., "IEEE standard for definitions of terms for antennas,", IEEE Std 145-2013 (Revision of IEEE Std 145-1993), 1–50, Mar. 2014.
3. Klemp, O., O. Schmitz, and H. Eul, "Polarization diversity analysis of dual-polarized log.-per. planar antennas," 2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications, Vol. 4, 2356-2360, Sep. 2005.
4. Zetik, R., J. Sachs, and R. S. Thoma, "UWB short-range radar sensing — The architecture of a baseband, pseudo-noise uwb radar sensor," IEEE Instrumentation Measurement Magazine, Vol. 10, No. 2, 39-45, Apr. 2007.
5. Mallahzadeh, A. R., A. A. Dastranj, and H. R. Hassani, "A novel dual-polarized double-ridged horn antenna for wideband applications," Progress In Electromagnetics Research B, Vol. 1, 67-80, Apr. 2008.
6. Adamiuk, G., S. Beer, W. Wiesbeck, and T. Zwick, "Dual-orthogonal polarized antenna for uwb-ir technology," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 981-984, 2009.
7. Schantz, H. G., The Art and Science of Ultra-Wideband Antennas, Artech House, 2005.
8. Adamiuk, G., L. Zwirello, L. Reichardt, and T. Zwick, "UWB cross-polarization discrimination with differentially fed, mirrored antenna elements," 2010 IEEE International Conference on Ultra- Wideband, Vol. 1, 1-4, Sep. 2010.
9. Mushiake, Y., "Self-complementary antennas," IEEE Antennas and Propagation Magazine, Vol. 34, No. 6, 23-29, Dec. 1992.
10. DuHamel, R. H., "Frequency independant antennas,", US Patent 2,985,879, Jul. 4, 1958.
11. Lorho, N., G. Lirzin, A. Chousseaud, T. Razban, A. Bikiny, and S. Lestieux, "Miniaturization of an UWB dual-polarized antenna," 2015 IEEE International Conference on Ubiquitous Wireless Broadband (ICUWB), 1-5, 2015.
12. DuHamel, R. H., "Dual polarized sinuous antennas,", US Patent 703,042, Apr. 1987.
13. Klemp, O., M. Schultz, and H. Eul, "Miniaturization techniques for logarithmically periodic planar-antennas," 15th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004, Vol. 1, 412-416, Sep. 2004.