A Study of the Application of the Extended Aperture Principle to Very Broad Band Steerable HF Arrays.
Abstract
The purpose of this program was to investigate the applicability of the Extended Aperture technique to the design and construction of large, linear, broadband, very high gain, high-power steerable arrays. Previous studies had encountered difficulty in construction of vertically polarized arrays operating over a bandwidth of greater than 3:1, and have had essentially no success with horizontally polarized arrays. The major problems to be addressed were quite clear. In the case of vertical arrays using log-periodic elements, the following problem areas dominate: (1) Maintaining proper radiation when the element spacing is such that strong negative mutuals are encountered; (2) Related to (1), the suppression of a tendency to develop two active regions at certain frequencies; (3) Proper low-frequency truncation in a very dense array. In the case of horizontal arrays using log-periodic elements, the following interrelated problems are of major concern: (1) Separation of phase centers resulting in grating lobes; and (2) Low frequency truncation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1973
- Accession Number
- AD0910331
Entities
People
- R. L. Tanner