COMPARISON WITH EXPERIMENT Figure 2 shows the input impedance of the aperture antennas attached to cutoff cavity comparing with experimental data. It is found that resonance occurs below the frequency of «=0.25X. Good agreement between theory and experiment can be observed indicating the validity of the analysis. NUMERICAL RESULTS Input admittance of the aperture antenna is plotted in Fig. 3 for the varying values of b/a. The sensitivity Q obtained from the admittance characteristics in the vicinity of resonant frequency and the shortening coefficient defined by T7=[a/x]r{,sonanc<, /0.25 are plotted in Fig. 4. As seen in Fig. 3 and Fig. 4, the conductance increases and
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