Duplex radio communication transceiver
US4792939A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 23, 1987 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Jan 23, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In order to reduce the size of a duplex radio communication transceiver such as a mobile telephone, this transceiver is constructed of a transmitting and receiving duplexer, a filter to be coupled to the duplexer, an amplifier for amplifying a signal received, and a filter to be connected with the output of the amplifier. All the filters are made of acoustic surface wave filters, and all the circuits are mounted on a single metallic substrate and sealed by means of a metallic casing into a module. The transceiver thus constructed has a volume which is one tenth as small as that of the device of the same kind according to the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.