Bandwidth Improvement in Large Reflectarrays by Using True-Time Delay

By Eduardo Carrasco, José A. Encinar, Mariano Barba. IEEE Transactions on Antennas and Propagation, 2008

243 citations recorded by the source corpus.

A significant improvement in the bandwidth of large reflectarrays is demonstrated using elements which allow true-time delay. Two identical, large reflectarrays have been designed using different phase distributions to generate a collimated beam. In the former, the phase distribution is truncated to 360deg as is usual in reflectarray antennas, while in the second, the true phase delay is maintained (three cycles of 360deg). The chosen phase-shifter elements are based on previously measured and validated patches aperture-coupled to delay lines. The radiation patterns for both reflectarrays have been computed at several frequencies and the gain is represented as a function of frequency for both cases. Bandwidth curves are presented as a function of the reflectarray size.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/798a4f431fbd89a21ab782ebde730ffda14622ed

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In Aerospace Engineering

In Electronic, Optical and Magnetic Materials

Citations in the corpus

X-Band Reflectarray Antenna With Switching-Beam Using PIN Diodes and Gathered Elements (2012, background): “tial spatial phase delay [13], low losses, low cross-polarization”
Reconfigurable Reflectarrays and Array Lenses for Dynamic Antenna Beam Control: A Review (2013, background): “While a complete list would be too long to present here, approaches to achieve wideband element designs tend to focus on either coupling multiple resonances together [11]–[13] or coupling antenna elements to true time delay (TTD) lines [14].”
Wideband Planar Microwave Lenses Using Sub-Wavelength Spatial Phase Shifters (2011, background): “Therefore, to achieve a frequency-independent focal point,thespatialphaseshiftersofaplanarlens(orareflectarray) must act as true-time-delay (TTD) units that provide different time delay values based on their position of the lens’ aperture [ 30 ].”
Reflectarray Antennas for Dual Polarization and Broadband Telecom Satellite Applications (2015, methodology): “Different techniques have been proposed to improve the bandwidth in large reflectarrays, such as the use of delay lines providing a phase range of several times 360◦ [24], the use of facetted configurations approximating a paraboloid [25], [26], or the use of reflectarray elements that are directly ”
Near-Field Communications: A Tutorial Review (2023, methodology): “To mitigate the performance degradation induced by beam split, an efficient method is to exploit true time delayers (TTDs) [60]–[62], which, similar to PSs, are analog components.”