A MICROWAVE METHOD FOR MEASURING THE MATCHING PROPERTY OF THE ATTENUATORS ON THE SUPPORTING RODS IN TWT

A simple, rapid, directly observable method for examining the supporting rod type attenuator s matching property is discussed. The fundamental principle employed is to measure and work out the relative attenuation distribution curve of the attenuator at microwave frequencies, and then by phase shift method to measure the VSWR S, value as an indication of matching quality of the attenuator in its region of slow variation in attenuation, compare and analyse the obtained curve and the S value in order to determine required form of the curve and slope of the starting section. When these are established, in further examination work on attenuators all one needs to do is just to measure and work out an attenuator's microwave relative attenuation distribution curve to see if it meets the requirement established. By adopting this method, one increases greatly the rapidity of measurement. From experimence, we can say that this method is not only useful in the development research work on TMT, but is useful on a small scale manufacturing of TMT's .