Study of Phase and Patterns Characteristics of a Sub-Wavelength Broadband Reflectarray Unit Element Based on Triple Concentric Circular-Rings
Keywords:
Broadband, concentric rings, patterns characteristics, unit elementAbstract
In this paper, phase and patterns characteristics of a sub-wavelength broadband reflectarray (RA) unit element are propounded. The unit element consists of triple concentric circular-rings on the Rogers 4003 substrate (H2) that provide a nearly 615 degree linear phase range. To obtain a phase curve with a lower slope, a 3 mm thick Foam (H1) is used and backed by a ground plane. A complete investigation analysis has been done to study the phase and patterns characteristics of the proposed sub-wavelength RA unit element. Results indicate that not only the incidence angle alter the element reflection phase, but also for oblique incidence, the element pattern deforms. It is shown, for sub-wavelength elements the combined effects of the mentioned factors are less severe.
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References
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