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Sony patents antenna design using specific capacitor and inductor formulas

Sony has been granted a patent for a communication device featuring a circularly polarized antenna. The design uses two antenna elements placed at right angles to each other, with a capacitor connected to one and an inductor to the other. The patent specifies exact mathematical formulas for calculating the size of these components based on the antenna's frequency and impedance.

Why it mattersThis is a routine hardware improvement that helps engineers design antennas that transmit signals more efficiently in specific directions.

In the filing’s own words

A communication device includes a circularly polarized antenna with a first antenna element and a second antenna element disposed orthogonally to the first antenna element; and a phase shifter that includes a capacitor connected to the first antenna element, and an inductor connected to the second antenna element, in which in a case where a resistance is denoted by R, an imaginary unit is denoted by j, a reactance is denoted by X, a center frequency of the antenna is denoted by f, a capacitance is denoted by C, and an inductance is denoted by L, an impedance of the antenna is represented by R+jX, a capacitance of the capacitor is a value calculated by C=1/{πf(R+X)}, and an inductance of the inductor is a value calculated by L=(R−X)/(4πf).

What exactly they claim (claim 1)

1. A communication device comprising: a circularly polarized antenna that includes a first antenna element, and a second antenna element disposed orthogonally to the first antenna element; and a phase shifter that includes a capacitor connected to the first antenna element, and an inductor connected to the second antenna element, wherein in a case where a resistance is denoted by R, an imaginary unit is denoted by j, a reactance is denoted by X, a center frequency of the antenna is denoted by f, a capacitance is denoted by C, and an inductance is denoted by L, an impedance of the antenna is represented by R+jX, a capacitance of the capacitor is a value calculated by C=1/{πf(R+X)}, and an inductance of the inductor is a value calculated by L=(R−X)/(4πf).

Facts

Company
Sony (Sony Group Corporation)
Official title
Communication device
Patent number
US12731902B2
Application number
18860752
Filed
May 8, 2023
Granted
Sep 8, 2026
Inventors
6
Claims
16

Classified under

H01Q 9/0492 Electricity & electronicsH01Q 1/04 Electricity & electronicsH01Q 1/288 Electricity & electronicsH01Q 3/36 Electricity & electronicsH01Q 9/20 Electricity & electronicsH01Q 9/30 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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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.