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Despite the numerous advantages of planar transmitarray antennas over conventional lens antennas, transmitarrays have a narrow bandwidth. The goal of this paper is to present a design methodology for improving the bandwidth of transmitarray antennas through control of the transmission phase range of the transmitarray elements. Two Ku-band transmitarrays using quad-layer double-square loop elements,...
Planar reflectarray antennas with parabolic-torus phase distribution are investigated for high-gain beam-scanning applications. Analytical expressions for the reflectarray aperture phase distribution are derived for the generalized offset configuration. A Ka-band planar reflectarray with 30 dB gain and 40 degree scan coverage is demonstrated. The study reveals that planar reflectarrays with parabolic-torus...
Since the early 1990's, printed reflectarrays antennas have emerged as the new generation of high-gain antennas, providing many advantageous features such as low-mass, low-profile, and low-cost over reflectors and printed arrays. Moreover, they are also quite suitable for applications requiring high-gain and beamscanning features. For the beam-scanning operation, one approach is to equip the reflectarray...
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