Two-feed full duplex transmitter/receiver for ultra small-aperture satellite communications terminal
US5805116A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1997 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q19/17
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The satellite communications terminal employs separate transmit and receive feedhorns, offset from one another, to achieve adequate isolation of received and transmitted signals during full duplex operation. In one implementation, described herein, the satellite communications terminal employs an ultra-small-aperture dish antenna having an aperture of about one meter. Signals are received and transmitted at Ku band wavelengths of about 12 gigahertz and 14 gigahertz respectively. For this implementation, an extended focal point zone occurs, rather than a discrete focal point. Both the receive and transmit feedhorns are positioned within the focal point zone thereby achieving adequate gain to both reception and transmission. However, the receive and transmit feedhorns are offset from one another to minimize the coupling of feedback transmission signals into the receive feedhorn. In one specific implementation, for use in transmitting signals to and receiving signals from a geosynchronous satellite, the receive feedhorn is positioned at an ideal focal point for reception to maximize the receive gain. The transmit feedhorn is offset within the focal point zone by an amount sufficient t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.