A Joint Army/Air Force Investigation of Reflection Coefficients at C and Ku Bands for Vertical,Horizontal and Circular System Polarizations.

摘要

This report describes an experimental effort to measure the reflection coefficients of typical airport structures at C-Band (5000 MHz) and Ku Band (15,000 MHz) for vertical (VP), horizontal (HP), and circular (CP) system polarizations. The choice of polarization is of vital concern in the implementation of microwave landing systems since it offers the designer an opportunity to minimize multipath reflections - the most critical factor limiting system performance. The measurements were made on buildings along the flight lines of Areas B and C at Wright-Patterson AFB, Ohio. It is shown for sixteen different combinations of frequency, grazing angle and reflecting surface that vertical polarization produced more severe specular reflections than either horizontal or circular radiation in every case. The HP measurements showed an advantage of at least 3 db over VP for 81% of the cases and in 88% of the cases the CP exhibited a similar advantage over VP.