NEAR-FIELD INVESTIGATION OF UNIFORMLY PERIODIC MONOPOLE ARRAYS
Abstract
The amplitude and phase characteristics of waves traveling along various uniformly periodic arrays of monopoles were investigated. It was found that these structures usually exhibit regions of frequency where the propagation constant is complex. Over these regions the structure may function as an effective radiator, the directional characteristics of which depend upon the relative phase and amplitude distribution of the wave(s) on the array. Of prime importance in the determination of the structure's directional properties is the sign of the phase constant over the first cell or two. This study led to extensive use of the Brillouin, or k-beta, diagram and its utility in the analysis and summation of the measured near-field data is shown. The measured far-field patterns illustrate the correlation between the actual and expected directional prop erties of the respective structures. The results of this study demonstrate that under appropriate conditions of phasing, backfire radiation may be established, and, further, that the rate of attenuation or decay of the near field depends upon the geometry of the structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 30, 1963
- Accession Number
- AD0409010
Entities
People
- Edward Hudock
Organizations
- University of Illinois Urbana–Champaign