Dual frequency antenna feeding with coincident phase centers
US4740795A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | May 28, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q5/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A dual frequency antenna feed includes colinear axially spaced coaxial and circular waveguide cavities separated by a conducting portion having a high frequency rectangular waveguide therein extending radially outward. The coaxial cavity includes a tubular inner conductor having a polarization rotator connected to the rectangular waveguide for propagating high frequency energy. Four small coaxial transmission lines equiangularly disposed about the cavity axes and terminating in probes about a quarter wavelength from the end of each cavity intercouples the circular and coaxial cavities. The end of the coaxial waveguide cavity forms an aperture for high frequency energy from the conducting inner tube and for the low frequency energy from the region between the conducting inner tube and the cylinder surrounding the outside of the cavity. The radiating aperture is surrounded by a set of concentric conducting rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.