Reflectarrays have received great attention in recent years due to their capabilities to provide large aperture solutions with simple feeding mechanism. They provide a useful solution in many aerospace and automotive applications to replace cumbersome reflector antennas and/or complex and lossy printed phased arrays. Many improvements have been brought to overcome the bandwidth limitations of first passive configurations and to achieve more advanced features such as dual-polarization or multiband operation. Meanwhile, various techniques have been investigated to obtain efficient active phase-shifting cells for pattern reconfiguration. They involve either discrete components (MEMS, pin diodes, varactors) or innovative tunable materials such as ferroelectrics or nematic liquid crystals.

We invite authors to submit original research as well as review articles reporting recent advances in reflectarrays performance improvements. We are particularly interested in new design methodologies and simulation techniques to face the modelling complexity of reflectarrays due to several issues, such as large number of elements, nonperiodic array configurations, multilayer phase-shifting cells and accurate feed characterization. Potential topics include, but are not limited to:

• Advanced analysis and synthesis techniques for large reflectarrays
• Near-field experimental validations of reflectarrays
• Innovative unit cell topologies for active and passive reflectarrays
• Bandwidth enhancement of reflectarrays
• Millimeter-wave reflectarrays
• Novel approaches for low-loss reflectarrays design
• Innovative tunable materials for beam-scanning reflectarrays
• Global optimization techniques for reflectarrays design
• Dual-polarized and circularly polarized reflectarrays
• Aperiodic and conformal reflectarrays
• Transmitarrays and planar lenses

Before submission authors should carefully read over the journal's Author Guidelines, which are located at http://www.hindawi.com/journals/ijap/guidelines/. Prospective authors should submit an electronic copy of their complete manuscript through the journal Manuscript Tracking System at http://mts.hindawi.com/ according to the following timetable: