MONOPULSE FAR-FIELD PATTERNS
Abstract
A general theory of monopulse tracking radars will be found in a recent book by Rhode. The present paper will serve as an adjunct to the monopulse problem, i.e. the analytical prediction of far-field patterns. The theoretical prediction of monopulse radiation patterns should prove useful for antenna system comparison. An idealized two-horn monopulse system is shown in Figure 1. Two primary sources are located symmetrically with respect to the focal axis. The sources are polarized in the x-direction and their back radiation is neglected. The two sources may be fed either in-phase or 180 degrees out-of-phase. The two fundamental sources of tracking information are the sum (in-phase) and difference (out-of-phase) radiation patterns. The quantities of interest are (1) the maximum gain of the sum pattern (2) the angular sensitivity of the difference pattern near boresight and (3) the product of (1) and (2) above. The radiation pattern will be calculated by two different methods: 1. Current distribution method suitable for machine computation. 2. Scalar diffraction theory (analytical expressions). The theoretical results will be presented for the case of rectangular waveguide illumination.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 23, 1959
- Accession Number
- AD0610259
Entities
People
- Sheldon S. Sandler
Organizations
- Massachusetts Institute of Technology