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A beam-scanning reflectarray antenna with an offset mechanically rotational horn is presented in this paper. Bifocal design method is employed to reduce the phase error caused by the rotational horn and the offset-feed structure is utilized to minimize the feed blockage effect on the broadside beams. The simulation results show that good scanning performance can be achieved with aperture efficiency...
In this paper, the characteristics of Reflectarray Antennas printed on convex curved surfaces are analyzed. In particular, results on the radiation performances of different Reflectarrays designed to be mounted on cylinders with different radii of curvature are presented and discussed.
The paper proposes a phaser-based differential feeding network for uniformly scanning antenna arrays. The feeding network is composed of a Wilkinson power divider connecting a phaser in one branch and a TEM transmission line in the other branch. An example of an antenna uniformly scanning from −60 degree to 60 degree within the frequency range of 4–6 GHz is presented for illustration.
The analogous relationship between the design parameters of offset parabolic reflectors and offset reflectarrays is delineated. Each antenna is specified with four design parameters that best describe the system setup, and the mathematical relationship between the design parameters of these two antenna systems is derived. The presented study allows one to determine the analogous reflectarray system...
The feasibility of designing single-feed transmitarray antennas with simultaneous multiple beams is investigated in this paper. Different far-field pattern masks and fitness functions are studied for multi-beam designs, and phase synthesis is achieved using the particle swarm optimization technique. A quad-layer configuration using double-square rings is selected for the transmitarray elements, and...
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...
Planar reflectarray antennas with spherical phase distribution are studied in this paper. Analytical expressions are derived for the aperture phase distribution, and the restricted aperture approach is used to minimize the effects of spherical aberration. The optimal feed position is determined by means of a phase error analysis, and a planar reflectarray with 30 dB gain and 30 degrees elevation coverage...
In this paper we investigate single-feed multi-beam reflectarray antenna designs. The direct method of superposition of beams is compared with the alternating projection method. The implementation of the alternating projection method for multi-beam performance is discussed. Also the effects of limited phase range and quantized phase values are integrated into the alternating projection method to minimize...
This paper presents an analysis and measurement results of using bow tie array-type tag antenna design in paper reel identification. The advantage of the bow tie array compared to a single bow tie is better readability from the opposite direction to S. This indicates that the bow tie array can harvest energy to the microchip and backscatter the identification data to the reader more efficiently from...
This paper presents a dual band surface wave antenna that radiates a monopole like pattern. The monopole like radiation pattern is realized by the diffractions of the surface waves, and the dual band operation is achieved using a modified cross strip feed with split branches. The return loss and the radiation patterns are presented to demonstrate the antenna characteristics
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