  A new kind of dual-band reflection-mode circular polarizers (RMCPs) is
introduced with wide bandwidth and wide-view at the operating frequencies. The
proposed RMCPs are based on dual-layer rectangular patches on both sides of a
substrate, separated by a foam or air layer from the ground plane. Required TE
susceptance of the first layer patches to produce circular polarization is
calculated using the equivalent transmission line model. Dimensions of the RMCP
are obtained using parametrical study for the two frequency bands, 1.9-2.3 GHz
and 7.9-8.3 GHz. In addition, it is indicated that the accepted view angle and
bandwidth of the proposed dual-layer RMCP are improved compared with the single
layer RMCP, significantly. Moreover, a tradeoff is observed for the dual-layer
RMCP on the bandwidths of X band and S band that can be controlled by
propagation angle of the incident wave. The proposed RMCP has 30.5 % and 33.7 %
bandwidths for less than 3 dB axial ratio with incident angles
{\theta}max=50{\deg} and {\theta}min=35{\deg}. Finally, simulation results are
met by the measurement for three angles of the incident wave.
