A Technique for Measurement of Individual Modes Propagating in Overmoded Waveguide

A simple measurement technique has been developed for determining the amplitude and relative phase of individual modes propagating in overmoded waveguide. This development was performed a s a portion o f the program on in-guide multimode power measurements.* The mode-measurement technique represents a significant step toward bridging the gap between total in-guide measured power and spectrum signature prediction. Also o f importance i s the use of the technique t o measure mode conversion when standard waveguide components are excited at frequencies outside of their design band.