Analysis of an End Launcher for a Circular Cylindrical Waveguide

The analysis of an end launcher type of transition exciting dominant TE/sub 11/ mode circular waveguide from a coaxial line is presented. The expressions for real and imaginary parts of impedance seen by the coaxial line are derived for the general case of offset launcher using self reaction of the assumed current over the loop. The dimensions of combined electric and magnetic loops having low input VSWR are determined. There is satisfactory agreement between theoretical and experimental results.