
Accession Number : AD0260555
Title : A SPHERE TECHNIQUE FOR THE MEASUREMENT OF THREE DIMENSIONAL RADIATION PATTERNS. PART 2. THEORY OF THE SPHERE TECHNIQUE
Corporate Author : ELECTROMECHANICS CO AUSTIN TEX
Report Date : 15 FEB 1960
Pagination or Media Count : 1
Abstract : A method is presented for gathering threedimensional radiation pattern data. A spherical reflector is placed at various positions in space and used a directional antenna to receive the reflection from the sphere. The basic reflection equation is developed and modified so that the reading on the intensity meter may be converted into the energy level at the sphere. The constant, K, of the sphere is developed and a test described whereby K may be determined. Rules for determining other parameters such as sphere size, distances between antennas and sphere, and frequencies at which the system is usable are all developed. A problem is worked out to demonstrate the use of the equation E equals KR sub 2 E sub R where E is the field strength in volts/meter at the sphere, E sub R is the field strength indicated at the field intensity meter, K is the sphere constant for the frequency considered, and R sub 2 is the distance between the sphere and the intensity eter antenna. A discussion of the method used to improve the signal to leakage ratio is given. The techniques described are limited to use of highpower, highfrequency radiation systems. (Author)
Descriptors : *ANTENNA RADIATION PATTERNS, *ELECTROMAGNETIC WAVE REFLECTIONS, *RADAR ANTENNAS, *TEST METHODS, AIRBORNE, ELECTROMAGNETIC RADIATION, HIGH FREQUENCY, MEASUREMENT, RADIOFREQUENCY, SPHERES
Distribution Statement : APPROVED FOR PUBLIC RELEASE