Frequency Dependence of APATS Antenna Gain
Abstract
If the APATS receiving array antenna is electronically steered by standard phase shifters at each element, the optimum gain for a signal arriving from a particular direction is dependent upon the frequency of the source. The APATS system requires simultaneous reception of two frequencies per re-entry vehicle, and optimum reception requires two sets of phase shifters per RV per polarization. This report examines the degradation of the array gain when one set of phase shifters is used for dual frequency reception. The gain of the array at the second, non-optimal frequency is dependent upon frequency separation, array size and illumination, and the direction cosines of the incident propagation vector with respect to the array axes. An array phase steering method which minimizes gain loss to one dB or less for typical cases is suggested. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1982
- Accession Number
- ADA115059
Entities
People
- G. A. Robertshaw
Organizations
- MITRE Corporation