Apple patents tunable filter to clean up wireless signals
Apple has been granted a patent for a specific circuit design used in wireless communication hardware. The invention uses a combination of inductors, capacitors, and a tunable resistor to block specific unwanted frequencies while letting the desired signal pass through.
In the filing’s own words
Wireless circuitry can include one or more notch filters. A notch filter can include a series inductor having a first terminal coupled to an input and having a second terminal coupled to an output, a first series capacitor having a first terminal coupled to the input and having a second terminal coupled to a node, a second series capacitor having a first terminal coupled to the output and having a second terminal coupled to the node, and a shunt resistor having a first terminal coupled to the node and having a second terminal coupled to a ground line. The notch filter can further include a shunt capacitor coupled in series with the shunt resistor between the node and the ground line. The shunt resistor can be a tunable resistor.
What exactly they claim (claim 1)
1. A filter circuit comprising: a first component of a first type coupled between a filter input port and a filter output port; a second component of a second type, different than the first type, having a first terminal coupled to the filter input port and having a second terminal coupled to a node; a third component of a third type, different than the first and second types, having a first terminal coupled to the node and having a second terminal coupled to a power supply line; and a shunt capacitor, separate from the second component, having a first terminal coupled to the node and a second terminal coupled to the first terminal of the third component.
Facts
- Company
- Apple (Apple Inc.)
- Official title
- Notch filter for wireless circuitry
- Patent number
- US12763746B2
- Application number
- 18890576
- Filed
- Sep 19, 2024
- Granted
- Oct 13, 2026
- Inventors
- 2
- Claims
- 17
Classified under
H03H 7/06 Electricity & electronicsH03H 2007/013 Electricity & electronicsMore from Apple in Chips & hardware
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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.