Equipment for Measurement of Spurious Emissions in Waveguide

A new equipment that measures multimode spurious emissions in waveguide has been developed. The measurement is performed by averaging the power coupled by a large number of short electric-field probes located on the periphery of an enlarged section of waveguide. The equipment has been used to measure multimode power in S-band waveguide at frequencies between 3 and 10 Gc with an accuracy of ±1 db. A smaller equipment has also been developed with a measurement accuracy of ±3 db up to 15 Gc.