On the Transmitted Beam Shift Through FSS Structure by Phase Analysis

The frequency selective surfaces (FSSs) are the vital components in multiband quasi-optical (QO) feed instruments for reflector antennas. Designers of QO use FSSs to combine beams in different frequency bands onto a shared feeding aperture. However, the FSSs will shift the transmitted beam, and that brings difficulties in the design and fabrication process of an QO instrument. In this letter, we report a simple and efficient method to predict the transmitted beam shift caused by FSSs. It is based on the phase analysis of the plane-wave transmission functions of FSSs within a range of incident angles. For an FSS design, the transmitted beam shift is predicted by the proposed method, and then verified based on the transmitted field distributions calculated by the plane-wave spectrum method. As shown in this letter, the advantages of the proposed method include briefness in concept and simplicity in implementation .

[1]  Ieee Microwave Theory,et al.  Quasioptical systems : Gaussian beam quasioptical propagation and applications , 1998 .

[2]  Wang Hongjian,et al.  Design of the second generation microwave humidity sounder (MWHS-II) for Chinese meteorological satellite FY-3 , 2012, 2012 IEEE International Geoscience and Remote Sensing Symposium.

[3]  Atef Z. Elsherbeni,et al.  A simple and efficient FDTD/PBC algorithm for scattering analysis of periodic structures , 2007 .

[4]  R. Cahill,et al.  Spatial demultiplexing in the submillimeter wave band using multilayer free-standing frequency selective surfaces , 2005, IEEE Transactions on Antennas and Propagation.

[5]  R. Wylde,et al.  The effect of quasi-optics errors on reflector antenna performance , 1992 .

[6]  R. Mittra,et al.  Techniques for analyzing frequency selective surfaces-a review , 1988, Proc. IEEE.

[7]  M. Jin,et al.  On Scattering From an Array of Absorptive Material Coated Cones by the PWS Approach , 2013, IEEE Transactions on Antennas and Propagation.

[8]  Laurent Costes,et al.  Microwave Humidity Sounder (MHS) antenna , 1999, Remote Sensing.

[9]  P. de Maagt,et al.  A 5-frequency millimeter wave antenna for a spaceborne limb sounding instrument , 2001 .

[10]  M. Bozzi,et al.  Accurate Modeling of Dichroic Mirrors in Beam-Waveguide Antennas , 2013, IEEE Transactions on Antennas and Propagation.

[11]  J. Miao,et al.  The plane-wave spectrum approach for beam transmission through planar FSS structures , 2012, 2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT).