ANALYSIS AND SYNTHESIS OF APERTURE FIELDS OF LOG PERIODIC ANTENNAS,
Abstract
The paper establishes the relationships between the variation of field intensity along the surface of a log-periodic (L.P) antenna and the propagation constant of its uniformly periodic prototype. The prototype is then studied to determine the effect of modifications of the structure on the aperture field of the L.P. antenna. It is proposed that the directivity of an L.P. antenna may be improved by designing it for multi-mode operation with multiple active regions from which radiation occurs. In order to evaluate the coupling of modes in the active regions of an L.P. dipole array a simple coupled mode periodic transmission line model has been employed. Between active regions the characteristic impedances of the two dominant modes are badly mismatched and little coupling occurs. In an active region the modes are strongly coupled and the resulting perturbation of the propagation constants is evaluated by coupled-mode theory. The effect of variation of several parameters of the structure to bring about desired modifications of the dispersion curve is also investigated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1965
- Accession Number
- AD0631674
Entities
People
- Richard B. Kieburtz
Organizations
- State University of New York