Interdigital duplexer with notch resonators
US4596969A · kind A · utility
18Cited by
8References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 8, 1985 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | May 8, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2136
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A duplexer includes an integral interdigital transmitter filter and parallel interdigital receiver filter in a common housing. A three-quarter wavelength antenna transformer section couples rf energy from the transmitter filter to an antenna and also couples rf energy from the antenna to the receiver filter and to an antenna cable connector. The receiver filter selectivity is improved by providing a notch resonator between a receiver transformer section and the housing, and the transmitter filter selectivity is improved by providing a notch resonator between a transmitter resonator and the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.