Abstract
A single-arm rectangular spiral antenna, which radiates multi-beam with radiofrequency-microelectromechanical system (RF-MEMS) capacitive series switches, is monolithic fabricated on rigid substrates (glass: /spl epsiv//sub t/ = 7.4 and quartz: /spl epsiv//sub t/ = 3.8). The spiral is configured by three-arms, which can be interconnected by two RF-MEMS series switches. The proposed antenna radiates left hand circular polarization (LHCP). The gain of multibeams is between 1 /spl sim/ 3 dBi for glass substrate and 3 /spl sim/ 5 dBi for quartz substrates. Multibeams of antennas satisfy a 3-dB axial ratio criterion at operating frequency band 11 GHz for glass and 6 GHz for quartz substrates.
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