Filter module and communication apparatus
US7586388B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2008 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | Oct 21, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2250/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a filter module, a common input/output portion of a switch circuit is set as a first port. A first filter arranged to pass a signal in a first frequency band is connected between a first input/output portion of the switch circuit and a second port. A second filter arranged to pass a signal in a second frequency band is connected between a second input/output portion and the second port. A phase adjusting circuit is provided such that an impedance in the second frequency band as seen from the first port while the switch circuit selects the first input/output portion is in a substantially short-circuited state. This arrangement prevents leakage of unwanted signals from a signal path used in a communication system not in operation among two communication systems for different frequency bands while the other communication system is engaged in communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.