Transmit/receive switch
US5909641A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Feb 24, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmit/receive switch includes a first quarter-wavelength transmission line coupled between an antenna port and a first variable impedance device. The first variable impedance device is coupled between the first quarter-wavelength transmission line and a signal common node. An impedance of the first variable impedance device is controllable variable between a low impedance value and a high impedance value. A second quarter-wavelength transmission line is coupled between first variable impedance device and a first port. A third quarter-wavelength transmission line is coupled between the antenna port and a second variable impedance device. The second variable impedance device is coupled between the third quarter-wavelength transmission line and the signal common node. Like the first variable impedance device, an impedance of the second variable impedance device is controllable variable between a low impedance value and a high impedance value. A fourth quarter-wavelength transmission line is coupled between the second variable impedance device and a second port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.