Reflectarray Element Based on Aperture-Coupled Patches With Slots and Lines of Variable Length

By Eduardo Carrasco, Mariano Barba, José A. Encinar. IEEE Transactions on Antennas and Propagation, 2007

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X-Band Reflectarray Antenna With Switching-Beam Using PIN Diodes and Gathered Elements (2012, background): “levels and a very linear phase response [14].”
Reconfigurable Reflectarrays and Array Lenses for Dynamic Antenna Beam Control: A Review (2013, unknown): “Fixed designs employing aperturecoupled microstrip delay lines [105] have been shown to substantially improve the bandwidth of reflectarrays to the 10% range.”
Reflectarray Antennas for Dual Polarization and Broadband Telecom Satellite Applications (2015, background): “Different broadband reflectarray elements have been proposed, including stacked patches of variable size [12], [13], aperture coupled elements [5], modified Malta crosses [8], and multiresonant elements on a single substrate layer [9]–[11].”
Lenses for Circular Polarization Using Planar Arrays of Rotated Passive Elements (2011, background): “patch is coupled to a strip-line or microstrip transmission line [34], [35].”
Bandwidth Improvement in Large Reflectarrays by Using True-Time Delay (2008, background): “For example, the resonance effects were compensated in [17] by properly adjusting the length of the aperture, and a reflectarray element was designed to provide a phase directly proportional to the line length.”