Title :
Bandwidth of reflectarrays
Author_Institution :
Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA
Abstract :
It is shown that the dominant factor controlling reflectarray bandwidth is the bandwidth of the radiating element, and that the effect of non-constant path delays over the surface of the flat reflector has little significance unless the aperture is electrically very large and the f/D ratio is small. An example of a polarisation-twist reflectarray using aperture coupled elements with time delay lines is used to demonstrate this conclusion.
Keywords :
antenna theory; delay lines; electromagnetic wave polarisation; microstrip antenna arrays; reflector antennas; aperture coupled elements; microstrip reflectarray; nonconstant path delays; polarisation-twist reflectarray; radiating element bandwidth; reflectarray bandwidth; time delay lines;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20030990
