ELECTROMAGNETIC SCATTERING AND ANTENNA TECHNOLOGY (EMSAT) Task Order 0003: Design of a Circularly Polarized, 20-60 GHZ Active Phased Array for Wide Angle Scanning
Technical Report,10 Apr 2015,10 Apr 2017
Defense Engineering Corporation Beavercreek United States
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The radiating aperture of a circularly polarized, active electronically scanned array AESA that operates from 20 GHz to 60 GHz and scans up to 60 from broadside is reported. Design guidelines for wideband arrays are briefly reviewed, and the linearly-polarized connected Vivaldi array is chosen as the radiating element due to its simplicity in design and fabrication. Infinite array simulations are used to characterize the performance of a linear-to-circular polarizer placed on top of a linearly polarized Vivaldi array. The transmission coefficient and axial ratio of the antenna-polarizer combination are roughly 60 and below 3 dB, respectively, across most of the band and for scan angles up to 60 from normal. The antenna efficiency and axial ratio degrade by 1 dB at some points near the edges of the band andor at wide scan angles.