Adaptive antenna matching
US5778308A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1996 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Dec 26, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0458
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a mobile radio telephone, an adaptive impedance matching circuit (25) is positioned between a transmitting power amplifier (24) and a duplexer (18). The adaptive matching circuit (25) matches an antenna (17) to associated electronic circuitry, thereby optimising power transfer in an effort to maintain communication with a base station and to minimise power dissipation within the device itself. An adaptation algorithm is selected and implemented during idle periods when a reflection coefficient is identified as being large. The reactance of a passive pi network is incrementally modified and settings which achieve an optimum match are stored for subsequent use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.