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In this paper, a single arm spiral antenna has been investigated about the characteristics ofpolarization and tilt beam. If a circumference length of spiral is bigger than a wavelength, it have a characteristic of varying maximum radiation beam direction. In addition, circular polarizations (RHCP, LHCP) can be variable by the feeding points (inner, outer). Also maximum beam directions tilt in different direction according to the circular polarizations, LHCP and RHCP. These characteristics of single arm spiral antenna are able to apply in the beam forming, diversity, MIMO application which has dual polarization using an antenna element. Key Words : Rectangular/circular-spiral antenna, Axial beam, tilted beam, RHCP and LHCP, Beam forming *  :  (changwoj@snut.ac.kr) 09 09 14  09 10 20  09 11 12 1.   (spiral antenna) (wideband), (CP; Circular Polarization),   (wide beamwidth)       ,    RF       [1-9].               () .      1 λ

Analysis of Polarization and Beam Tilt Characteristics of Single Arm Spiral Antenna by Varying Length and Feed