A Wideband Monofilar Helical Reflectarray Antenna With Large-Angle Beam-Scanning Performance

A circularly polarized wideband reflectarray is presented using a monofilar single-turn helical antenna as reflecting element. An $11\times 11$ elements designed, simulated and measured in X-band which demonstrates wide bandwidth large-angle beam-scanning performance. Phase range of 360° obtained by rotating off-centred elements. Full wave simulations show that 1-dB 29.1% achieved at the center frequency 10 GHz with maximum gain 23.9 dB normal angle incidence ( notation="LaTeX">$\boldsymbol {\phi }$ = 0°, {\theta 0°) where for focused beam 23.6 an aperture efficiency 51.7%. Simulated tested axial ratio less than 3 from 8.9 to 10.7 GHz. Moreover, scanning performance verified changing +30° −30° both orthogonal planes loss be 1.3 all scanned angles. Feasibility design demonstrated radiation results are good agreement simulations.