Abstract
The radiation efficiency prediction using the Wheeler cap is introduced using a semianalytic approach based on the adaptive fitting quality factor method. The procedure details, highlighting the benefits of using the proposed method, are presented, especially in the presence of cavity modes. Also, a procedure is proposed to eliminate the effect of cavity modes for low-frequency antenna measurements. Several studies over the suitability of the proposed procedure are presented to justify the usage of the quality-factor-based method beyond its previous limited usages. The reproduction of results is ensured by considering sufficient data based on an asymptotic prediction of the cavity modes’ frequency spacing. Moreover, full-wave simulation results are presented to verify the proposed method and its immunity to the effects of arbitrary Wheeler caps’ cavity modes in a controlled environment, anticipating possible sources of errors. Also, the same simulated responses are used through other circuit model-independent radiation efficiency prediction procedures to evaluate the performance of the proposed method. Furthermore, the measurement results are presented for various antennas to verify the proposed method in comparison with the full-wave analysis.
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