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RHCP pattern‐reconfigurable spiral antenna biased with two DC signals
Author(s) -
Gong Liang,
Yang Yi,
Chan King Y.,
Ramer Rodica
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28411
Subject(s) - spiral antenna , optics , microwave , spiral (railway) , physics , bandwidth (computing) , diode , microelectromechanical systems , beam (structure) , azimuth , biasing , antenna (radio) , pin diode , voltage , electrical engineering , optoelectronics , radiation pattern , engineering , telecommunications , coaxial antenna , mechanical engineering , quantum mechanics
A right‐hand circularly polarized beam steering spiral antenna is presented in this article. It is designed using the standard p‐i‐n technology, enhanced with arm switches and biasing lines. The ensuing design is easily manufactured and is functionally competitive with the more complex ones, based on RF‐MEMS. Three beams, tilted 40° with respect to the spiral central axis, are generated at 3.3 GHz, suitable for WiMax systems at this frequency. These beams are directed at approximately 90°, 180°, and 270° in the azimuth space. Beam directions depend on various configurations of the seven p‐i‐n diodes added to the spiral structure. The states of the diodes are subjected to the two DC bias voltages connected to the spiral arm. The radiation performance over the 200‐MHz bandwidth (3.2–3.4 GHz) is relatively stable. Measurements in this band show the reflection coefficient below −10 dB and the axial ratio below or close to 3 dB at the peak beam directions. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1636–1640, 2014