Ceramic block filter having nonsymmetrical input and output impedances and combined radio communication apparatus
US5406236A · kind A · utility
8Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1992 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Dec 16, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/2056
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Ceramic block filters can be constructed to have non-symmetrical, i.e. unequal, input and output impedances. These filters can be used to eliminate impedance matching networks in radio communications devices. These impedance matching networks (22, 14) are precluded when the input and/or output of a ceramic block filter (100) is controlled by appropriate selection of the physical parameters of the block to achieve a direct impedance match between an adjacent circuit element and subsequent signal processing stages in the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.