These antennas operate in the frequency range from below 2 to above 40. The Vivaldi antenna is one of the valuable tools for MWI due to its attractive features like compact size, broader bandwidth, higher directivity, lower in cost, and end-fire a radiation 27. Chen, Transfer functions measurement for UWB antenna, in IEEE APS International Symposium, vol. Vivaldi antenna, is an exponentially tapered slot antenna, was originated by Gibson 2. Zhang, Research on a novel miniaturized antipodal Vivaldi antenna with improved radiation, IEEE Antennas Wireless Propag. A Vivaldi-Monopole antenna is a small form ultra-wideband antenna configured for low frequency operation in modern wireless devices. One is a horn antenna and the other is Tapered slot. Baum, Extending the definitions of antenna gain and radiation pattern into the time domain, Sensor and Simulation Notes, Note 350, 1992. From antenna theory, it is known that there mainly are two kinds UWB antennas satisfying this requirement. Davis, Designing antennas for UWB systems, in Microwave & RF, 2003, pp. Wiesbeck, Transient responses of a Vivaldi antenna and a logarithmic periodic dipole array for ultra wideband communication, in IEEE APS International Symposium, vol. Gibson, The Vivaldi aerial, in Proceedings of the 9th EuMC, Brighton, UK, September 1979, pp. Wu, Wide-slot antenna for UWB applications, in IEEE AP-S International Symposium, vol. A Vivaldi antenna or Vivaldi aerial 1 or tapered slot antenna 2 is a co-planar broadband- antenna, which can be made from a solid piece of sheet metal, a printed circuit board, or from a dielectric plate metalized on one or both sides. Fullerton, The diamond dipole: a Gaussian impulse antenna, in IEEEAP-S International Symposium, vol.
Barnes, The COTAB UWB magnetic slot antenna, in IEEE APS International Symposium, vol.
Federal Communications Commission (FCC), Revision of Part 15 of the Commission’s Rules regarding Ultra Wideband Transmission System, First report and order, ET Docket 98-153, FCC 02-48: Adopted: Februreleased: April 22, 2002.
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