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Abstract
A new method for achieving amplitude reconfiguration in a reflectarray antenna is presented in this Letter. An individual unit cell is a compact multilayer structure, including a silver inkjet-printed layer for rapid prototyping of the reflectarray. A small infrared light emitting diode (IR-LED) illuminating a silicon wafer provides the reconfiguration in the system. Various illumination intensities of the IR-LED allow for differing magnitudes of reflection from the unit cell. This provides the potential for radiation pattern tapering or amplitude modifications of the gain of the reflectarray. Simulation and measurement results for a single unit cell are presented here, with the matching between measurement and simulation also allowing for the change in the values of conductivity of the silicon to be extracted.
Highlights
The incorporation of reconfigurability in such an antenna typically focusses on the use of active elements to adjust the reflection phase [1]
Between on and off states, the Conclusion: A novel reconfigurable unit-cell is proposed for sidelobe reduction in reflectarrays, in which the reflection magnitude is controlled by an optically activated semiconductor substrate
Inkjet printing of silver is used for rapid prototyping of the grating layer, allowing quick turnaround in the design process
Summary
The incorporation of reconfigurability in such an antenna typically focusses on the use of active elements to adjust the reflection phase [1]. PIN diodes, microelectromechanical (MEMs) switches and liquid crystals have been demonstrated in reflectarray antennas to provide variation in the reflection phase of the unit-cells [2, 3]. Adjustment of the reflection amplitude of each unit-cell is another area in which reconfiguration can be incorporated.
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