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Using the moment method, an asymmetrical two-wire spiral antenna has been analyzed in the presence of a conducting plane reflector. The spiral outer circumference is appropriately chosen for dual CP radiation. It is found that dual operation for a 3-dB axial-ratio criterion is obtained in a frequency bandwidth of 3%. Dual operation is also attained for a reflector-backed loop antenna with perturbation...
This paper is a sequel to the previous paper (K. Hirose et al., 2004), and demonstrates the effects of the HS sections on the radiation characteristics. For this, the method of moments is applied to the analyses of curl and spiral antennas whose HS sections are removed. Using the analyzed current distributions, the radiation characteristics are calculated and compared with those of curl and spiral...
A monofilar-spiral antenna is excited through a helical wire. The antenna characteristics, including the input impedance, radiation pattern, and gain, are analyzed. It is revealed that a purely resistive 50-/spl Omega/ input impedance is realized by appropriately selecting the pitch angle of the helical wire. A tilted beam, which is often required in mobile communications, is obtained with a gain...
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