UNIDIRECTIONAL MEDIUM-WAVEBAND LOG-PERIODIC ANTENNA,
Abstract
The characteristics of a zig-zag-shaped log-periodic antenna operating in the medium wavelength band were studied. The geometric shape of the antenna is specified by three parameters: the effective length L, the angles alpha between the antenna axis and the end elements, and the scale multiplier tau. Expressions for the antenna directional pattern were first derived, and then the characteristics of an antenna with alpha sub s = alpha sub E = 25 degrees and tau = 0.95 were checked experimentally. The antenna was made from copper wire 2 mm in diameter. An unacceptably wide main lobe and large side lobes were obtained for the antenna. To improve the directional pattern and decrease the side lobes, the angle alpha sub s was decreased from 25 degrees to 17 degrees. With an angle of 17 degrees, the average directional pattern was 40 degrees at the half-power points in the frequency band from 600 to 950 MHz; the level of side lobes was in the range of 30%.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 23, 1968
- Accession Number
- AD0685540
Entities
People
- E. M. Zhurbenko
- G. A. Kliger
Organizations
- National Air and Space Intelligence Center