Patent ID: 11857304
Assignee: AMAZON TECHNOLOGIES, INC.
Field: Medical technology (Instruments)
Classification: CPC A  H | IPC A  H

Claim 0:
1. A wearable device comprising:
a support structure that retains the wearable device proximate to a user;
an antenna mounted to the support structure, the antenna comprising:
a first portion of the antenna that is affixed to a substrate, wherein the first portion of the antenna has a first end, a first midpoint, and a second end, and
a second portion of the antenna that is affixed to the substrate, wherein the second portion of the antenna has a third end that is a first distance from the first end, a second midpoint that is a second distance from the first midpoint, and a fourth end that is the first distance from the second end, and further wherein the second distance is greater than the first distance;

a transmitter connected to the first end of the first portion of the antenna and the third end of the second portion of the antenna;
a receiver connected to the second end of the first portion of the antenna and the fourth end of the second portion of the antenna;
a first memory, storing computer-executable instructions; and
a first hardware processor, wherein the first hardware processor executes the computer-executable instructions to:
operate the transmitter to generate a first signal at a first time;
operate the receiver at the first time to receive the first signal;
determine a first phase difference of the first signal as received by the receiver relative to the first signal generated by the transmitter; and
determine, using the first phase difference, a concentration of a type of molecule.