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OPTIMIZATION OF MICROWAVE CIRCULAR-VIEW DISC ANTENNA DESIGN FOR SENSORS CONTAINING TRANSCEIVERS

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An optimized design of a disk antenna is described, which provides a circular (or sector) view as part of video surveillance sensors (azimuthal movement of objects, security systems, etc.). Theoretically calculated and experimentally measured radiation patterns of the emitters determined by their design features, are presented. The results allow to optimize gradually design of the all-round looking antenna, which is a system of two identical discs with four axial emitters on each disc extending radially from the discs centers. The angle between adjacent radiators on the disk is 90 °. The disks are located coaxially, while they have an azimuthal offset relative to each other at an angle of 45 °, which provides a full circular or any sector view in the azimuthal plane. For this antenna design, frequency separation of the radiators is also possible. Experimentally determined optimal distance between the disks providing the best (minimum) overlap of the main beams of the radiation patterns of the radiators and their electrodynamic decoupling, equals to the radiation wavelength λ for the central frequency f0 = 10 GHz (λ = 3 cm). The operating frequency range of the antenna is 8-12 GHz.

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