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- W114425519 abstract "Abstract — This paper presents the design and the effectiveness of reducing the unit cell size of microstrip reflectarray which is duplicated the same radiating aperture as quadratic backscatter. A reflectarrays with variable element sizes and reduced grid spacing have been designed at 10 GHz. For a given number of elements, it is shown that increased gain can be attainted for reduced unit cell size with no significant change in array size. Index Term s — reflectarray, broad-beam antenna I. I NTRODUCTION A planar reflector or microstrip reflectarray is a printed low-profile antenna that consists of a grounded flat onto which a quasi-periodic array of resonant conducting element (patches or dipoles) is etched [1]-[4]. This operation is similar in concept to a parabolic reflector that naturally forms a planar phase front when a feed is placed at its focus. Each element phase can be adjusted to produce a required phase law over the antenna aperture. In the wireless communication applications such as wireless local area network (WLAN) large-scale indoor base station [5], it is desirable the antenna which has wide beam to cover a broad area. The wide beam reflectarray for WLAN antenna is an alternative as shown in Fig. 1 [6]. A reflectarray configuration is attractive because it allows a single mechanical design to be used repeatedly for a wide variety of different coverage specifications. The only changes are required that the printed reflecting element dimensions can be changed for each design, in order to generate the new shaped beam. Thus, many of the high recurring costs associated with shaped-reflector antennas can be eliminated with flat printed reflectarrays [7]. The flat geometry of a reflectarray also lends itself to easier placement and deployment on the WLAN large-scale indoor base station and also in terms of manufacture. However, it is generally observed that when the antenna beam is enlarged, the antenna gain is reduced. In this paper, we have investigated the influence of the unit cell size of reflectarray on the gain performance. To achieve such" @default.
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- W114425519 date "2007-01-01" @default.
- W114425519 modified "2023-09-22" @default.
- W114425519 title "Design and Performance Improvement of Broad-Beam Microstrip Reflectarray" @default.
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