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Reconfigurable aperture-coupled reflectarray element tuned by single varactor diode

Electronics Letters (Impact Factor: 1.07). 01/2012; 48(2):68-U32. DOI: 10.1049/el.2011.3691

ABSTRACT A reconfigurable aperture-coupled reflectarray element offering a continuous tuning of the reflection phase is presented. A single varactor load is demonstrated to be sufficient for a full tuning range. Experimental validations are reported for the measured reflection phase of an X-band reflectarray element.

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Available from: Giuseppe Di Massa, Aug 30, 2015
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    • "GHz, corresponding to an operational frequency band equal to 8.5% (Fig. 5). An improved reconfigurability frequency band can be observed with respect to the value obtained in the case of the configuration adopting a linear phase tuning line [4] [5], which increases from 4.4% up to 8.5% (see Table II). Fig. 5. Measured reflection phase vs frequency for different varactor bias voltages Vbias. "
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    ABSTRACT: A varactor-loaded radial phasing line is proposed in this work to actively tuning the phase of an aperture-coupled reflectarray cell, thus allowing to enlarge the reconfigurability frequency range. The proposed approach is applied to design an X-band 0.45λ λ λ λ× 0.45λ λ λ λ reflectarray cell giving a 320° phase agility within a measured frequency range of about 8.5%, significantly greater with respect to that achievable by a simple linear phasing line.
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    • "The design of antennas at such high frequencies cannot be afforded with conventional designs. Many original solutions, such as printed antennas on membrane structures [1], reflectarray [2] and many kinds of lens antennas have been proposed. Fabry-Perot [3] antennas [4] give a very interesting solution, as they can provide a high agility in the design-synthesis. "
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    ABSTRACT: A new approach is proposed for the study of a pla-nar Fabry-Perot antenna. A reliable description of the coupling between the cavity and the feeding waveguide is developed by taking into account for all the relevant eigenfunctions both in the waveguide and into the cavity. The cavity field is used to compute equivalent currents on radiating apertures, obtaining from them the radiated far field. The approach can be adopted for the analysis as well as for the synthesis of a large variety of cavity antennas.
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    • "By properly sizing the line length, with particular attention to the extent of the open ended section, the phase agility of the antenna is maximized. In fact, as already demonstrated by the authors in [25], the above reflectarray element may offer a full phase tuning range of about 320 . Although a similar configuration has been proposed in [26], a limited 120 -phase range has been demonstrated. "
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    ABSTRACT: Abstract—An aperture-coupled reflectarray element giving a full phase tuning range with a single varactor diode is proposed in this paper for pattern reconfigurability applications. The full phase agility is achieved by a proper optimization of the phase tuning line, thus providing an alternate inductive/capacitive effect able to avoid the use of two varactor diodes, usually adopted in similar existing configurations. The proposed active element structure is adopted to design a demonstrative reflectarray prototype of 3 15 radiators. Furthermore, an own synthesis procedure is applied to obtain the proper biasing voltages giving the prescribed H-plane field. Test examples of beam-scanning, multibeam, and shaped-beam patterns are discussed to demonstrate the effectiveness of the approach.
    IEEE Transactions on Antennas and Propagation 02/2013; 61(2):635-645. DOI:10.1109/TAP.2012.2226229 · 2.46 Impact Factor
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