Antenna duplexer and transmitting/receiving apparatus using the same
US5634200A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1996 |
| Grant date | May 27, 1997 |
| Priority date | — |
| Expiry date | Jan 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/15
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an antenna duplexer, one antenna is used by switching transmission signals and reception signals having different frequencies. The antenna duplexer includes a high-frequency switching circuit and a band-pass filter. The high-frequency switching circuit supplies the transmission signals from a transmission part to the antenna. The band-pass filter outputs the reception signals outputted from the antenna to the predetermined receiving circuit. In the band-pass filter, the frequency characteristic is selected and set to impress the frequency of the transmission signals, and simultaneously the reflected wave generated at the input end so that impedance increases at the frequency band of the transmission signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.