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US 10,680,580 B2Granted
Saw filter with a large bandwidth
AssigneeSnapTrack, Inc.
InventorsThomas Dengler, Thomas Bauer
Life of this patent
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Abstract
A filter arrangement with a large bandwidth is specified, wherein a first and a second filter are connected in parallel between a first and a second node. Both filters are configured as DMS filters and both comprise two DMS tracks each, connected in series. The two filters have different center frequencies and create a common passband together.
Claims9
A filter arrangement, comprising:
- a first double mode surface acoustic wave (DMS) filter;
- and
- a second DMS filter, wherein:
- the first DMS filter and the second DMS filter are connected to each other in parallel between a first node and a second node of the filter arrangement;
- each of the first DMS filter and the second DMS filter comprises two DMS tracks, connected in series;
- a center frequency of the first DMS filter is larger than a center frequency of the second DMS filter;
- a first DMS track of the two DMS tracks of the first DMS filter and a second DMS track of the two DMS tracks of the first DMS filter each comprises an input or output converter and at least a first coupling converter and a second coupling converter;
- the input or output converter of the first DMS track is coupled with the first coupling converter of the first DMS track via a first capacitive element and with the second coupling converter of the first DMS track via a second capacitive element;
- and
- the input or output converter of the second DMS track is coupled with the first coupling converter of the second DMS track via a third capacitive element and with the second coupling converter of the second DMS track via a fourth capacitive element.
7 more elements
The filter arrangement according to any of the preceding claims, wherein:
- the two DMS tracks of the first DMS filter are connected to each other via the first and second coupling converters;
- the two DMS tracks of the second DMS filter are connected to each other via two or more coupling converters;
- and
- for each DMS track of the first DMS filter and the second DMS filter, the coupling converters are arranged in phase opposition, and earth connections of the coupling converters are connected to each other but not to an external potential.
1 more element
A method, comprising:
- using a filter arrangement as a receive filter, the filter arrangement comprising:
- a first double mode surface acoustic wave (DMS) filter;
- and
- a second DMS filter, wherein:
- the first DMS filter and the second DMS filter are connected to each other in parallel between a first node and a second node of the filter arrangement;
- each of the first DMS filter and the second DMS filter comprises two DMS tracks connected in series;
- a center frequency of the first DMS filter is larger than a center frequency of the second DMS filter;
- a first DMS track of the two DMS tracks of the first DMS filter and a second DMS track of the two DMS tracks of the first DMS filter each comprises an input or output converter and at least a first coupling converter and a second coupling converter;
- the input or output converter of the first DMS track is coupled with the first coupling converter of the first DMS track via a first capacitive element and with the second coupling converter of the first DMS track via a second capacitive element;
- and
- the input or output converter of the second DMS track is coupled with the first coupling converter of the second DMS track via a third capacitive element and with the second coupling converter of the second DMS track via a fourth capacitive element operating the receive filter for two adjacent bands;
- and
- performing, via the receive filter, simultaneous reception in the two bands within a Carrier Aggregation mode.
10 more elements
Dependencies are inferred from the claim text.