ANALYTICAL STUDY OF THE CIRCULAR POLARIZATION SELECTIVE SURFACES - 7.75 AND 15GHz

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Authors
  1. Chow, Y.L.
Corporate Authors
Waterloo Univ Research Inst, Waterloo ONT (CAN);Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
Dr. W.V. Tilston invented the principle of the circularly polarized selective surface (CPSS) in 1986. The surface is a large planar array of crossed dipoles. Each crossed dipole pair is separated by lambda/4 distance but is connected between the two feed points by a lambda/2 transmission line. Dr. Tilston constructed a CPSS surface with incomplete success since he had difficulty in fitting the lambda/2 transmission line length to the lambda/4 separation of the dipole pair. Loading of the transmission line by high dielectric constant material to relieve such difficulty is ruled out because of the construction difficulty and expenses involved for a large array of over 1000 dipole pairs. The purpose of this contract is to give a new cross dipole design to overcome such difficulty without the above loading of transmission line. This design has been done and the two left-hand CPSS surfaces constructed has been measured and found to give the desired polarization selective property. The construction and measurement were done by Til-tek Inc. under a separate contract from DREO (W7714-8-5651/01-SV). This report gives the details of the design and the underlying principle. Briefly, the principle is to take the transmission line length to be lambda/4, instead of lambda/2, but to embed the remaining lengths of transmission line in the dipole pair, that is: lambda/8 in each dipole. TRUNCATED
Keywords
CPSS (Circular Polarization Selective Surface)
Report Number
WRI-1468101;DREO-CR-93-632 — Contractor Report (Final)
Date of publication
01 Mar 1990
Number of Pages
30
DSTKIM No
97-01301
CANDIS No
501754
Format(s):
Hardcopy;Document Image stored on Optical Disk

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