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US 7,583,936 B2Granted
Circuit with reduced insertion loss and component comprising one such circuit
AssigneeEpcos AG
InventorsGünter Kovacs, Veit Meister, Florian Schnirch, Martin Bünner
Life of this patent
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Abstract
An electrical circuit has at least two parallel signal paths connected to one another on the antenna side and for which a band reject filter corresponding to the transmission range is implemented in a second signal path for frequency-selective improvement of insertion loss in the transmission range of a first signal path. With a band reject filter, the signal is reflected to the junction of the parallel signal paths arising from the second signal path and thus is rerouted to the first signal path.
Claims24
A circuit comprising:
- a first signal path comprising a band pass filter having a transmission range;
- a second signal path comprising a band reject filter having cut-off region;
- and
- an antenna connection that is connected to the circuit directly or via another circuit;
- wherein the first and second signal paths are parallel and are interconnected at a point between the antenna connection and the band pass filter and band reject filter;
- and
- wherein the transmission range overlaps the cut-off region at least in part, and
- wherein the first and the second signal paths are always available to transmit data.
5 more elements
A circuit comprising:
- a first signal path comprising a band pass filter having a transmission range;
- a second signal path comprising a band reject filter having cut-off region;
- and
- an antenna connection that is connected to the circuit directly or via another circuit;
- wherein the first and second signal paths are parallel and are interconnected at a point between the antenna connection and the band pass filter and band reject filter;
- wherein the transmission range overlaps the cut-off region at least in part;
- wherein the band reject filter comprises a band reject filter circuit or a trap circuit;
- wherein the band reject filter comprises a plurality of discrete components;
- and
- wherein the band reject filter comprises at least one of a band reject filter chip, a chip comprising a trap circuit, and a chip comprising at least one resonator, and
- wherein the first and the second signal paths are always available to transmit data.
8 more elements
Dependencies are inferred from the claim text.