EFFECT OF TRANSMISSION LINE MISMATCH ON CAVITY Q WITH PARTICULAR APPLICATION TO FERRITE DIELECTRIC LOSS MEASUREMENTS.
Abstract
An analysis is made of how mismatches in the transmission lines connecting a cavity affect the Q of the cavity. It is shown that the cavity Q can be higher or lower than the Q that would be obtained in the absence of a mismatch depending on certain phase angles. The maximum possible change in the cavity Q is a function of the mismatch, and also the ratio of the radiation resistance due to a cavity iris to the unloaded resistance of the cavity. The above results are applied to the measurement of the dielectric loss tangent of ferrites. It is shown that there can be significant errors under conditions that may occur in practice. It is also shown that the use of a ratiometer will substantially compensate the error due to a mismatch if the mismatch is located on the generator side of the cavity. However, the ratiometer will not help if the discontinuity is located on the output side of the cavity. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1968
- Accession Number
- AD0675479
Entities
People
- Isadore Bady
Organizations
- United States Army Communications-Electronics Command