Transmit/receive switch for phased array antenna
US5289142A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Mar 31, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/0025
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmit/receive (T/R) module of an electrically steered phased array antenna having a receiver comprising a T/R switch, an impedance matching and bias feed network, and a low noise amplifier. The T/R switch comprises a .pi. network to provide a matched termination for protecting the receiver in the transmit mode. This .pi. network emulates a one-eighth wavelength transmission line by providing a 45 degree phase delay, but it exhibits the isolation and bandwidth characteristics of a one-quarter wavelength line. The T/R switch effectively isolates the low noise amplifier from an antenna during transmit mode and uses less than half the area on a substrate typically required for a conventional one-quarter wavelength transmission line. In a receive mode the T/R switch has minimal effect on an RF input signal passing through it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.