A SPHERE TECHNIQUE FOR THE MEASUREMENT OF THREE DIMENSIONAL RADIATION PATTERNS. PART 2. THEORY OF THE SPHERE TECHNIQUE
Abstract
A method is presented for gathering three-dimensional 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, high-frequency radiation systems. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1960
- Accession Number
- AD0260555