Samsung Patents a Smartwatch Sensor That Doubles as a Wireless Signal Booster

By Patentlyze Team · Updated Jun 19, 2026

The tiny electrode on the back of your smartwatch that reads your heart rate might soon be doing a second job: helping the watch talk to your phone.

What Samsung's dual-purpose wearable electrode actually does

Smartwatches pack a lot of hardware into a small space, and finding room for both health sensors and wireless antennas is a real engineering headache. Samsung's new patent describes a way to make one component do both jobs.

The electrode on the back of the watch — the part that touches your wrist and reads electrical signals from your body — is wired up so it can also act as part of the watch's wireless antenna. A small switching circuit decides, moment to moment, which role the electrode is playing. When the watch needs your heart data, the signal flows one way. When it needs to send or receive a wireless signal, it flows another way.

Think of it like a garden hose with a splitter: the same pipe, but a valve chooses whether water goes to the flower bed or the lawn. Samsung is essentially doing that with electrical signals inside your watch, which could mean thinner devices, better antenna performance, or both.

How the switch circuit juggles health sensing and RF signals

The patent describes a wearable — most likely a smartwatch — built around a frame with a conductive portion that acts as an antenna for wireless communication. A cover plate on the back of the device houses an electrode that detects low-frequency electrical signals from the wearer's body, the kind used for ECG (electrocardiogram) or bioelectrical impedance readings.

The clever part is the dual-path wiring. The electrode connects to the processor through a first electrical path that filters for biological signals. It also connects through a second electrical path to a switch circuit tied to the antenna's ground — the reference point that makes the antenna work efficiently.

A switch circuit (essentially a tiny electronic relay) lets the processor toggle the electrode's role in real time:

• Health-sensing mode: the electrode reads body signals, the RF path is isolated.
• Wireless mode: the electrode connects to the antenna's ground, improving the antenna's performance.
• The processor controls which mode is active, potentially switching between them very quickly.

This approach lets Samsung use the electrode as structural antenna hardware instead of adding separate antenna components, which matters a lot when every cubic millimeter of wearable space is contested.

What this means for future Galaxy Watch hardware

Antenna design in wrist-worn devices is notoriously difficult. The human body absorbs RF energy, which degrades signal quality, and there is almost no physical room for a well-tuned antenna. By routing the back-plate electrode into the antenna's ground circuit, Samsung could improve wireless reliability without adding hardware — a meaningful gain for devices like the Galaxy Watch that already push the size limits of what fits on a wrist.

For you as a wearer, the practical upside could be more consistent Bluetooth and LTE connections, especially during workouts when the watch moves around on your wrist. There is also a longer-term angle: if fewer dedicated components are needed, future watches could be thinner or pack a larger battery in the same footprint.

Editorial commentary on a publicly published patent application. Not legal advice.