Investigation of coaxial to plane converter in UWB antenna

The reflection of tapered transmission line impedance is analyzed in theory and the VSWR curve of coaxial to plane converter is drawn. Using the FDTD method, the transmission of coaxial to plane converter is simulated. And the loss of transmission is analyzed. A TEM horn antenna with coaxial to plane converter which can endure high power is made for experiment. The reflection of the converter and pattern in E-plane of the antenna are measured. The experiments verify that there is no aberrance when UWB pulse transmits through the converter, and the efficiency of transmission reaches 85% when the length of converter is long enough. The results of experiment accord with that of simulation and theory analysis.