Analysis Of Multimode Microwaves In Oversize Wave-Guide Using An Infrared Camera Image Of Radiated Power Distribution

A new method of mode analysis of multimode microwaves in an oversize waveguide is developed which utilizes infrared camera images of the radiation profile of microwaves launched from the waveguide end. Systematic variations of the radiation pattern with different phase shifts among constituent modes are compared with theoretical predictions to identify the constituent modes and to determine their fraction of power. Characteristics of a step-wise modulated TE02-TE01 mode converter are examined by using this method. It is demonstrated that this method is useful as a practical means for on-site analysis of waveguide properties.