Multiple-transmission-channel active antenna arrangement
US3942119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Feb 27, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H11/346
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An antenna has two output terminals and is operative for receiving electromagnetic radiation and converting the same into electrical signals appearing across the two antenna output terminals. There are provided a first and a second transmission channel, each having a respective input comprised of a pair of input terminals, and respectively operative for transmitting electrical signals having frequencies lying in a predetermined first frequency range and in a predetermined higher second frequency range, one of the input terminals of the first channel being connected to one of the two antenna output terminals. A transformer includes a primary winding connecting the other of the input terminals of the first channel to the other of the two antenna output terminals. The transformer further includes a secondary winding connected across the two input terminals of the second transmission channel. The transformer is operative when the frequency of the electrical signal across the antenna output terminals is in the aforementioned first range for stepping down the input impedance of the second channel as reflected into the circuit of the primary winding to a value lower than the value of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.