Article

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

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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    • "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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    • "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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    • "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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