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US 9,438,197 B2Granted
Reconfigurable multi-band filter
AssigneeMicrosoft Technology Licensing, LLC
InventorsJavier Rodriguez De Luis, Alireza Mahanfar, Benjamin J. Shewan, Stanley Yu Tao Ng
Life of this patent
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Abstract
Reconfigurable multi-band filter techniques are described. In one or more implementations a device includes a radiating structure and a filter connected to the radiating structure configured to filter wireless signals received by the radiating structure. The filter includes switchable resonators configured to tune to different frequency bands and tunable capacitors configured to tune to different frequencies within the different frequency bands.
Claims19
A device comprising:
- a radiating structure configured to receive a wireless signal for a plurality of different wireless communication techniques in different frequency bands;
- and
- a single filter configured to tune to frequencies within the different frequency bands and receive the wireless signal from the radiating structure at a first port and to output a filtered wireless signal at a second port, the single filter comprising:
- a single radio frequency path between the first port and the second port, the single radio frequency path comprising:
- a first capacitor connected between the first port and a common capacitor;
- and
- a second capacitor connected between the common capacitor and the second port;
- a plurality of selectable individual resonant structures configured to pass different passband frequencies, the different passband frequencies being adjustable within the different frequency bands associated with the resonant structures,
- the plurality of selectable individual resonant structures including a first set of the selectable resonant structures and a second set of set of selectable resonant structures,
- wherein a single one of the resonant structures in the first set of resonant structures is selectively connectable at a time between a first node in the single radio frequency path and ground, the first node between the first capacitor and the common capacitor, and
- wherein a single one of the resonant structures in the second set of resonant structures is selectively connectable at a time between a second node in the single radio frequency path and ground, the second node between the common capacitor and the second capacitor;
- and
- tunable capacitors configured to adjust the passband frequencies of the resonant structures.
10 more elements
A method for use with a single filter including a first set of selectable resonant structures, a second set of selectable resonant structures, and tunable capacitors, the method comprising:
- coarse tuning the single filter to a first frequency band by selecting a first one of the resonant structures in the first set of resonant structures and a first one of the resonant structures in the second set of resonant structures;
- fine tuning the single filter to a particular frequency within the first frequency band using the tunable capacitors;
- filtering a first wireless signal, received via a radiating structure, with the single filter course tuned to the first frequency band and fine tuned to the particular frequency within the first frequency band, to thereby produce a first filtered signal;
- coarse tuning the single filter to a second frequency band by selecting a second one of the resonant structures in the first set of resonant structures and a second one of the resonant structures in the second set of resonant structures;
- fine tuning the single filter to a particular frequency within the second frequency band using the tunable capacitors;
- and
- filtering a second wireless signal, received via the radiating structure, with the single filter course tuned to the second frequency band and fine tuned to the particular frequency within the second frequency band, to thereby produce a second filtered signal.
4 more elements
An apparatus comprising:
- an antenna including a radiating structures;
- a single filter, which is configured to tune to frequencies within different frequency bands, wherein the single filter is communicatively connected to the radiating structure;
- and
- a logic control module that is coupled to the single filter;
- the single filter including
- a single signal path between an input and an output of the single filter;
- a first set of selectable resonant structures;
- a second set of selectable resonant structures;
- and
- tunable capacitors;
- the logic control module a configured to
- selectively shunt connect one of the selectable resonant structures in the first set of selectable resonant structures to a first node of the single signal path, and selectively shunt connect one of the selectable resonant structures in the second set of selectable resonant structures to a second node of the single signal path, to thereby tune to the different frequency bands, and
- adjust the tunable capacitors to tune to the frequencies within the frequency bands.
10 more elements
Dependencies are inferred from the claim text.