Band reject filters
US8004371B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2010 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Aug 16, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/74
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Distributed band reject filters are disclosed. A first radio frequency band reject filter is disclosed having a splitter having a first input port, a first output port and a second output port, the splitter being operable on an input signal applied to the first input port to provide a respective output signal proportional to the input signal at each of the first and second output ports, the output signals having a phase shift between 45 degrees and 135 degree with respect to the input signal, as well as first, second and third acoustic resonators coupled respectively to the first input port, the first output port and the second output port. A second radio frequency band reject filter is disclosed having a combiner having a first input port, a second input port and a first output port, the combiner being operable on an input signals applied to the first input port and the second input port to provide a respective output signal proportional to the input signals at the first output port, the output signal having a phase shift between 45 degrees and 135 degree with respect to the input signals, as well as first, second and third acoustic resonators coupled respectively to the first inp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.