We extend the Kroll-Yu (KY) method of determining the resonance parameters of single-port cavities to multiport cavities by substituting the determinant of the S matrix for the reflection coefficient used in the KY method. In addition, we present a method for computing the elements of the S matrix in the two-port case, based upon the properties of cavity modes formed when the waveguides associated with the ports are shorted. Extension to the n-port case is discussed.
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