Title :
Vivaldi Antennas for Microwave Imaging: Theoretical Analysis and Design Considerations
Author :
Chiappe, Marco ; Gragnani, Gian Luigi
Author_Institution :
Dept. of Biophys. & Electron. Engineering, Genova Univ.
Abstract :
The geometrical and electrical features of the Vivaldi antenna are studied in the light of the frequency-independent antenna theory. A scaling principle is derived for the exponential tapering of the antenna, and a closed-form model for the current distribution is provided. Such theoretical results are in good agreement with several numerical simulations performed by using the NEC2 code. Furthermore, a practical feeding system, based on a double-Y balun, is developed and tested to obtain a more systematic approach to the design of the aforesaid antennas
Keywords :
antenna theory; baluns; broadband antennas; current distribution; microwave imaging; NEC2 code; Vivaldi antennas; broadband antennas; closed-form model; current distribution; double-Y balun; exponential antenna tapering; frequency-independent antenna theory; microwave imaging; practical feeding system; Antenna feeds; Antenna theory; Current distribution; Frequency; Image analysis; Impedance matching; Microwave imaging; Numerical simulation; System testing; Vivaldi antennas; Broadband antennas; Vivaldi aerial; double-Y balun; frequency-independent antennas; microwave imaging;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2006.884289
