Approximate formulas for the far fields and gain of openended rectangular waveguide
Abstract
Approximate formulas are derived for the far field and gain of standard, openended, unflanged, rectangular waveguide probes operating within their recommended usable bandwidth of frequencies. (Such probes are commonly used in making probecorrected nearfield antenna measurements.) The formulas, which yield forward farfield power patterns and onaxis gains of Xband and larger waveguide probes to within about 2 dB and 0.2 dB accuracy, respectively, assume (sin thetacos theta) azimuthal angular dependence and an Eplane pattern given by the traditional aperture integration of the TE10 mode Eand Hfields in the StrattonChu equations.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 May 1983
 Bibcode:
 1983STIN...8411384Y
 Keywords:

 Antenna Radiation Patterns;
 Far Fields;
 Wave Amplification;
 Waveguide Antennas;
 Electric Fields;
 Integral Equations;
 Parallel Plates;
 Rectangular Waveguides;
 Reflectance;
 Superhigh Frequencies;
 Communications and Radar