Title :
A Cassegrain Offset-Fed Dual-Band Reflectarray
Author :
Huang, J. ; Han, C. ; Chang, K.
Author_Institution :
Jet Propulsion Lab., Pasadena, CA
Abstract :
An X/Ka dual-band microstrip reflectarray with circular polarization (CP) has been constructed using thin membranes and Cassegrain offset-fed configuration. It is believed that this is the first Cassegrain reflectarray ever been developed. This antenna has a 75-cm-diameter aperture and uses metallic subreflector and angular-rotated annular ring elements. It achieved a measured -3 dB-gain bandwidth of 700 MHz at X-band and 1.5 GHz at Ka-band, as well as a CP bandwidth (3 dB axial ratio) of more than 700 MHz at X-band and more than 2 GHz at Ka-band. The measured peak efficiencies are 49.8% at X-band and 48.2% at Ka-band
Keywords :
electromagnetic wave polarisation; microwave antenna arrays; multifrequency antennas; offset reflector antennas; reflector antenna feeds; 1.5 GHz; 2 GHz; 700 MHz; 75 cm; Cassegrain offset-fed dual-band reflectarray; angular-rotated annular ring elements; circular polarization; metallic subreflector; microstrip reflectarray; thin membranes; Antenna measurements; Aperture antennas; Bandwidth; Biomembranes; Dual band; Feeds; Laboratories; Polarization; Propulsion; Space technology;
Conference_Titel :
Antennas and Propagation Society International Symposium 2006, IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
1-4244-0123-2
DOI :
10.1109/APS.2006.1711089
