Title :
Scattering matrix integral equation analysis for the design of a waveguide Rotman lens
Author :
Peterson, Andrew F. ; Rausch, Ekkehart O.
Author_Institution :
Georgia Tech. Res. Inst., Atlanta, GA, USA
fDate :
5/1/1999 12:00:00 AM
Abstract :
An integral-equation-based procedure is developed for determining the scattering parameters of a multiport Rotman lens device. The device is intended for use at millimeter-wave frequencies and incorporates rectangular waveguide feeds. The integral equation model takes higher order modes in the feed apertures into account and incorporates mutual coupling between neighboring ports. A prototype lens was designed using the integral equation model and fabricated. The lens S-parameters were measured and modified with an ideal -40 dB (n=3) Taylor weighting function. The resulting beam sidelobe level is better than -30 dB
Keywords :
S-matrix theory; S-parameters; antenna feeds; directive antennas; electromagnetic coupling; integral equations; lens antennas; millimetre wave antenna arrays; multiport networks; rectangular waveguides; waveguide antenna arrays; 37 GHz; S-parameters; Taylor weighting function; beam sidelobe level; design; fabrication; feed apertures; higher order modes; millimeter-wave frequencies; multiport Rotman lens device; mutual coupling; neighboring ports; rectangular waveguide feeds; scattering matrix integral equation analysis; scattering parameters; waveguide Rotman lens; Apertures; Feeds; Frequency; Integral equations; Lenses; Millimeter wave measurements; Mutual coupling; Rectangular waveguides; Scattering parameters; Transmission line matrix methods;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
