Closed form solution for the asymmetrical T-antenna

This paper presents two improved closed form solutions for the asymmetrical T-antenna. The first one is simple and the second one is obtained using the induced EMF method. A new current distribution which comprises an additional sinusoidal term to compensate for the discontinuity caused by the difference in characteristic impedance of the vertical and horizontal parts of the asymmetrical T-antenna is considered. The analysis in terms of sinusoidal current enables one to obtain closed form solutions for which much less execution time is needed on the computer as compared with that needed by the moment method. The input impedance calculated by these expressions showed excellent agreement with that calculated by the moment method till (H+L/sub L/)//spl lambda/=0.35 where H is the height above the ground plane, L/sub L/ is the length of the longer horizontal part of the asymmetrical T-antenna and /spl lambda/ is the wavelength.