Reconfigurable aperture-coupled reflectarray element tuned by single varactor diode

Electronics Letters (Impact Factor: 0.93). 01/2012; 48(2):68-U32. DOI: 10.1049/el.2011.3691


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
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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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    • "In particular, good beam-steering performances have been obtained within an angular region going from −25 ∘ up to 25 ∘ . In this work, the reflectarray cell proposed in [7] [8] [9] [10] is properly redesigned in order to enlarge the allowable beam scanning area, so to give the opportunity for designing wide-angle beam-steering antennas, suitable for radar applications. Pointing out that a large scan angle requires a close element spacing, less than or equal to half wavelength at the operating frequency [15], a reflectarray unit cell with a reduced size equal to 0.46í µí¼† 0 × 0.46í µí¼† 0 (í µí±“ 0 = 11.5 GHz) is proposed. "
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    ABSTRACT: An electronically tunable reflectarray element is proposed in this work to design beam-steering antennas useful for radar applications. A reduced size reflectarray unit cell is properly synthesized in order to extend the antenna beam scanning capabilities within a wider angular region. The radiating structure is accurately optimized to provide a full phase tuning range by adopting a single varactor load as phase shifter element. A 0.46λ-reflectarray cell is designed at the frequency of 11.5 GHz, obtaining a phase agility of about 330°. The cell is successfully adopted for the design of a reconfigurable reflectarray. The antenna is numerically tested for different configurations of the varactors capacitance values, and good beam-steering performances are demonstrated within a wide angular range.
    Full-text · Article · Jul 2013 · Journal of Electrical and Computer Engineering
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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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