[天线]22 A NEW TWO-FLARE-SHAPED UWB ANTENNA ELEMENT

A NEW TWO-FLARE-SHAPED UWB ANTENNA ELEMENT J^"  
Anatoliy O. Boryssenko1), Dmitriy L. Sostanovsky2) I"AgRa  
1)Antennas & Propagation Laboratoty, University of Massachusetts, Amherst b d!|/Lk  
2)Ratio Research Company, Kiev, Ukraine YTWlR]Tr6?  
Abstract X}
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A novel compact UWB antenna is based on using of two smoothly shaped flares of a =6o,{taZ.~  
simple geometrical structure. The first flare, larger in size, serves as an antenna _@-D/g  
base, reflector and one of the radiator arms. The second flare, smaller in size, Jng,:$sZ  
operates as the other arm of the radiator. An apparent idea is exploited in this ctqXzM `  
design that an “ideal” UWB antenna would operate as a broadband well-matched q>JW$8  
transformer for the current at its driving ports to the radiated fields that leave the 4|PNsHXt
 
antenna aperture. Besides terminal matching, the antenna would provide a \*24NB  
necessary spatial distribution of the radiated energy. In order to create such a \:`'!X1*U  
current-to-field transformer the flares of the proposed antenna are properly shaped /<J&ZoeJB  
and driven through direct connection to coaxial cables without balun. The antenna io8c[#"uU  
is studied through numerical full-wave simulations and tests with several S4qj}`$ Yv  
prototypes. The achieved performance in the band >5:1 involves <-10dB return loss, kaK0'l2%  
>10dB fr .. MJxTzQE  
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