Sea surface antenna
US7123200B1 · kind B1 · utility
6Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 1991 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | May 2, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/34
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A sea surface antenna comprises a cylindrical tube of metallic material 13 on a dielectric former. The tube has a longitudinal slot shorted at each end and coupled at its midpoint to a coaxial feed. The slot is bridged by two groups of capacitances each group being distributed along a respective half of the slot. The length of the antenna is less than 0.25 λ and the diameter of the antenna is less than 0.02 λ, where λ is the free space wavelength at the operating frequency. The antenna is dimensioned so as to operate in an evanescent mode at a resonant frequency less than the cut-off frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.