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A two-arm spiral antenna excited in phase radiates a circularly polarized (CP) bidirectional beam. This bidirectional beam is transformed into a CP unidirectional beam using a conducting cavity as a reflector. The height of this cavity is chosen to be extremely small to realize a low-profile antenna: 0.077 wavelength at the lowest design frequency. The antenna characteristics, including the radiation...
The bi-directional beam from an equiangular spiral antenna (EAS) is changed to a unidirectional beam using an electromagnetic band gap (EBG) reflector. The antenna height, measured from the upper surface of the EBG reflector to the spiral arms, is chosen to be extremely small to realize a low-profile antenna: 0.07 wavelength at the lowest analysis frequency of 3 GHz. The analysis shows that the EAS...
An equiangular spiral antenna consisting of equiangular spiral slots cut in a finite-sized round conducting sheet (PEC sheet) located in free space is analyzed. The analysis reveals that the input impedance is not sensitive to the diameter of the conducting sheet, and remains constant at approximately 60 pi ohms. Frequencies from 1 GHz to 20 GHz are used for the analysis and it is found that the spiral...
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