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In recent years, ultra-high-frequency (UHF) radio frequency identification (RFID) systems have drawn more and more attentions in a wide variety of applications such as retail item management, access control system, electronic toll collection, and etc. By incorporating with a commercial RFID reader, it has been noted that the phased array antenna can be implemented in a RFID system to either control...
In this paper, the tuning and steering of a rectangular patch antenna is controlled by switching the patch and folded dipoles configuration. This reconfigurable antenna is controlled by the changing the voltage across a number of P.I.N. diodes in the parasitic elements. This antenna with the associated RF control unit forms a reconfigurable antenna which provides one solution to a number of communications...
This paper presents the development of a handset adaptive antenna using a constant modulus algorithm (CMA). The antenna is a switched-beam phased array antenna which can assist initialization of CMA. The method to improve convergence property of CMA exploits a beam with maximum received power from several switched-beams of the antenna as an initial beam. A square patch of one wavelength width provides...
In this paper, we show that the design of a UWB Butler matrix can be accomplished using couplers and phase shifters in microstrip/slot technology. As a result of the proposed approach, we present the design of a 4-element switched-beam array antenna operating between 3.1 and 10.6 GHz. An UWB switched-beam array antenna formed by four tapered slot antennas and a 4x4 Butler matrix has been presented.
In this paper, we propose a configuration of antenna system for mobile ground terminal using GPS and gyroscope terminal unit as automatic-navigation system to track the ETS-VIII satellite. To miniaturize the antenna system we introduce an electronically tracking rather than mechanically by use of a developed control program. With this configuration the antenna system becomes light and low profile...
Conformal array antennas (CAA) [L. Josefsson and P. Persson, 2006] will find their potential and promising applications in a variety of fields ranging from space-borne, airborne, ship-borne, and missile-borne radar, space vehicles and wireless communications to sonar, etc. Their benefits include reduction of aerodynamic drag, wide angle coverage, space saving, potential increase in available aperture,...
This paper proposes the configuration of a polyhedral array antenna arranged on a polyhedron and describes the limitation of coverage gain of polyhedral antennas. Here, a cube, an octahedron, a dodecahedron, an icosahedron, the truncated icosahedron (soccer ball type), the polyhedron with 60 triangles, and the polyhedron with 80 triangles are considered. And, the relation between the minimum coverage...
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