A Cassegrain Offset-Fed Dual-Band Reflectarray

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

[1]  J. Huang,et al.  Microstrip reflectarray with elements having variable rotation angles , 1997, IEEE Antennas and Propagation Society International Symposium 1997. Digest.

[2]  J. Huang,et al.  A C/ka dual frequency dual Layer circularly polarized reflectarray antenna with microstrip ring elements , 2004, IEEE Transactions on Antennas and Propagation.

[3]  Houfei Fang,et al.  Improvement of the three-meter Ka-band inflatable reflectarray antenna , 2001, IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229).

[4]  R. E. Freeland,et al.  Large Inflatable Deployable Antenna Flight Experiment Results , 1997 .

[5]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.

[6]  John Huang,et al.  Inflatable microstrip reflectarray antennas at X and Ka-band frequencies , 1999, IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010).

[7]  Kai Chang,et al.  Circularly polarized reflectarray with microstrip ring elements having variable rotation angles , 2004, IEEE Transactions on Antennas and Propagation.

[8]  J. Huang,et al.  A high efficiency offset-fed X/ka-dual-band reflectarray using thin membranes , 2005, IEEE Transactions on Antennas and Propagation.

[9]  R. Pogorzelski,et al.  A Ka-band microstrip reflectarray with elements having variable rotation angles , 1998 .