Electronic means for switching antennas to a common bus
US5084710A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1990 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Nov 21, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q3/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A circuit for selecting an input to a signal processing network from among several switchable antenna units. Each antenna unit includes a winding which is connected to a common signal bus. The switchable antenna units may be placed in "on" or "off" states in response to a controller, such as a microprocessor. One terminal of each winding is connected to a transistor which causes the terminal to be in an open condition when the unit is unselected, attenuating any signal which might otherwise be transmitted to the signal bus. A second winding is inductively coupled to the first winding and is used to improve attenuation of unselected signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.