Rotating field polarization antenna system
US4198641A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1977 |
| Grant date | Apr 15, 1980 |
| Priority date | — |
| Expiry date | Feb 14, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna system particularly suitable for permitting low cost reception of broadcasted circularly polarized television low and high VHF signals is provided by arranging all of the broadcast antennas so that the low and high VHF television frequency signal waves are radiated in opposite directional senses of circular or elliptical polarization. The low cost receiving antenna for receiving both of these bands comprises a pair of linear elements with the first of the pair of elements adapted to receive linearly polarized waves in a first linear polarization and a second of the elements adapted to receive linearly polarized waves in a second orthogonal polarization. A combining means includinga delay is provided for combining the signal waves received at one of the pair of elements with delayed signal waves received at the other of the receiving elements where the delay is on the order of one-quarter wavelength at a frequency within the low VHF frequency band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.