AN ANTENNA ARRAY OF LONGITUDINALLY-SLOTTED DIELECTRIC-LOADED WAVEGUIDES
Abstract
The investigation concerned the design of an antenna made up of an array of dielectric-loaded rectangular waveguides with common narrow walls. Longitudinal slots were cut in the center of each broad wall. The preferred form of the antenna utilized a slab of dielectric was placed over all the slots, although it also operated when dielectric was placed within each guide. An approximate theory is discussed and empirical design data are presented from which an experimental model of this antenna was designed. Empirical data are also given for cases in which dielectric was placed inside the waveguides. The radiated H-field from this antenna was parallel to the antenna aperture, and the main beam was directed up from the apperture at an angle equal to the arc cosine of the velocity of light divided by the slotted-waveguide phase velocity. An experimental antenna was constructed using standard 0.900-by-0.400-inch waveguide, and had an aperture 9 inches wide by 20 inches long. At the design frequency of 10 kmc the E-plane and H-plane beamwidths were 5.4 and 8.0 degrees, respectively, and the E-plane and H-plane firstsidelobe levels were -22.0 db and -23 db, respectively. Good radiation patterns were obtained from 8 to 11 kmc. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1961
- Accession Number
- AD0255747
Entities
People
- E.d. Sharp
- E.m.t. Jones
Organizations
- SRI International