A Thinned High Frequency Linear Antenna Array to Study Ionospheric Structure.
Abstract
The design, modeling, and performance measurements of a high frequency (HF) linear antenna array with 36 sensors is reported. The array was designed to achieve a narrow azimuthal beamwidth while maintaining grating lobes 10 dB below the main beam during a + or - 30 deg scan in azimuth. The configuration chosen utilizes two active vertical monopole elements and two parasitic backpoles to form a subarray. The subarrays, or sensors, are spaced at distances greater than half a wavelength to provide a large effective array aperture while the elemental radiation pattern, provided by the subarrays, suppresses the grating lobe as the array is scanned. Radiation patterns for the array were determined using three independent techniques: theoretical calculation, computer modeling using the Numerical Electromagnetics Code (NEC), and measurement of the fielded antenna. Results showed close agreement in antenna performance among the three methods of pattern determination. The three step process of theory, numerical modeling and measurement appears to be an optimum approach to antenna design.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1991
- Accession Number
- ADA240764
Entities
People
- Anthony J. Gould
Organizations
- Rome Laboratory