Composite Excitation for a Two-Arm Spiral Antenna
説明
This paper describes novel movement of the direction of the maximum radiation from a two-arm spiral antenna. Antenna feed points F1 and F2 are excited with V1 volts and V2 volts, respectively, where the phase of V1 is 0 degrees and the phase of V2 is 180 degrees plus a deviation angle of $\alpha _{dev}$ degrees. This is treated as a superimposition of the excitation from a pair of out-ofphase voltage sources (OutPVSs) and the excitation from a pair of in-phase voltage sources (InPVSs). The OutPVSs generate a circularly polarized (CP) beam in the broadside direction, while the InPVSs generate a CP conical beam around the vertical center axis normal to the antenna plane. It is found that a change in voltage V2 relative to voltage V1 moves the direction of the CP maximum radiation in a specific direction. The 3-D radiation is presented, as well as other antenna characteristics.
収録刊行物
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- 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)
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2019 URSI Asia-Pacific Radio Science Conference (AP-RASC) 1-4, 2019-03-01
IEEE