SUMMARY This paper proposes a genetic algorithm (GA) based design method for arbitrarily-shaped resonant elements that offer enhanced reflectarray antenna performance. All elements have the specified phase property over the range of 360 • , and also have dual-polarization and low cross-polarization properties for better reflectarray performance. In addition, the proposal is suitable for linear-to-circular polarization conversion elements. Thus, polarizer reflectarray elements are also presented in this paper. The proposed elements are validated using both numerical simulations and experiments.
This paper presents resonant elements for polarization conversion reflectarray. These elements have reflection-phase difference between the V-pol. and the H-pol. is about 90°range more than the fractional bandwidth 10% (axial ratio < 1.5) and the reflection phase characteristics are almost linear phase curves for the wide frequency range. To verify usefulness of the proposed elements, an offset-feed reflectarray constructed by them in the Ku-band is designed, and also the polarization property of the radiation pattern is investigated numerically and experimentally.
Abstract-This paper presents low cross-polarization single-layer reflectarray elements for dualpolarization use. These elements have an omega-shaped symmetrical structure to realize the crosspolarization reduction and also provide parallel linear reflection-phase properties with almost the same slop characteristics for the frequency, thereby achieving the desirable reflection phase range more than 360 • over the wide frequency range. To verify effectiveness of the proposed elements, a reflectarray antenna with an offset feed is constructed by them, and wideband frequency characteristics are also confirmed at Ku-band numerically and experimentally.
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