US Patent 9093734 Miniature radio frequency directional coupler for cellular applications

Patent 9093734 was granted and assigned to Rfaxis, Inc. on July, 2015 by the United States Patent and Trademark Office.

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US Patent 11973475 Apparatus and methods for true power detection

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Patent abstract

A directional coupler with increased directivity and reduced overall footprint area is disclosed. There is an input port, an output port, a coupled port, and a ballasting port. A primary chain of serially connected inductors is connected to the input port and the output port, while a secondary chain of serially connected inductors is connected to the coupled port and the ballasting port. A first compensation capacitor is connected to the input port and the coupled port, and a second compensation capacitor is connected to the input port and the ballasting port.

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