Spiral antenna above a composite HIS reflector

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Description

A spiral antenna radiates a circularly polarized (CP) wave in the two directions normal to the spiral plane (bidirectional radiation) [1]. For more effective utilization of the input power, this bidirectional radiation is transformed into unidirectional radiation using a conducting plane reflector [2]. Usually, the antenna height above the conducting plane is set to be one-quarter wavelength of the design frequency, to obtain an in-phase condition between the wave directly radiated into free space from the spiral and the wave reflected from the conducting plane.

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