Accession Number : AD1037817


Title :   ELECTROMAGNETIC SCATTERING AND ANTENNA TECHNOLOGY (EMSAT) Task Order 0003: Design of a Circularly Polarized, 20-60 GHZ Active Phased Array for Wide Angle Scanning


Descriptive Note : Technical Report,10 Apr 2015,10 Apr 2017


Corporate Author : Defense Engineering Corporation Beavercreek United States


Personal Author(s) : Pfeiffer,Carl R ; Tomasic,Boris


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1037817.pdf


Report Date : 08 Aug 2017


Pagination or Media Count : 76


Abstract : 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 and/or at wide scan angles.


Descriptors :   electronically scanned array , transmission lines , circuit boards , antenna arrays , bandwidth , cross polarization , fabrication , genetic algorithms , printed circuits , wide angles , insertion loss , impedance , POLARIZERS


Distribution Statement : APPROVED FOR PUBLIC RELEASE