An improved method for the determination of Q of cavity resonators

Singh, A. (1958) An improved method for the determination of Q of cavity resonators IRE transactions on microwave theory and techniques, 6 (2). pp. 155-160. ISSN 0097-2002

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The various Q factors and circuit efficiency of a cavity resonator can be evaluated from standing-wave measurements on a transmission line or waveguide coupled to the resonator. In the usual method, measurement errors near the half-power points have an unduly large influence on the result. This paper describes a method in which this type of error is avoided. In the new method, vswr and position of minimum at various frequencies are plotted on a Smith chart and a circle is drawn through the points. This circle is suitably rotated around the center of the chart and a value of equivalent susceptance is read off for each frequency. The graph of susceptance vs frequency is a straight line, whose slope the Q factors are evaluated. The underlying theory of the above method is discussed and typical experimental results are presented. Charts of parameters required in the calculations are given.

Item Type:Article
Source:Copyright of this article belongs to IEEE.
ID Code:76798
Deposited On:07 Jan 2012 04:11
Last Modified:07 Jan 2012 04:11

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