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Interpolation Algorithms for Smooth Rectilinear Antenna Plots

 Discrete far-field samples require interpolation to produce continuous rectilinear plots. Cubic spline provides smooth curves, while bilinear is suitable for 2D spherical-to-Cartesian conversions. Nearest neighbor is fast but jagged. MATLAB’s “interp2” with the ‘cubic’ method is commonly used. Proper sampling is critical: intervals must satisfy the Nyquist criterion relative to pattern beamwidth to avoid aliasing. This approach allows accurate visualization of antenna patterns in elevation and azimuth cuts.
 

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By Usha K Answered 1 year ago

 Use “Electric (Et = 0)” boundary on waveguide end face. Alternatively, place a “Perfect Electric Conductor (PEC)” object at the end. For port calibration, define waveguide port at short location with deembedding to move reference plane if needed. Verify with S11 magnitude ≈1 and phase near 180°.
 

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