Samsung Patents a Multi-Layer Circuit Board Design for Measuring Wireless Signal Power

By Patentlyze Team · Updated Jun 19, 2026

Inside every phone that sends a wireless signal, something has to keep tabs on how much power is actually going out. Samsung's new patent describes a tidier way to do that job — without bolting on extra components.

What Samsung's built-in RF power tap actually does

Imagine your phone is broadcasting a Wi-Fi or cellular signal. Before that signal reaches the antenna, the phone needs to check: is the power level correct? Too high wastes battery; too low drops the connection. A small circuit called a "coupler" quietly siphons off a tiny sample of the signal to measure it — without meaningfully weakening what gets sent.

Right now, these couplers can take up valuable real estate on a phone's circuit board. Samsung's patent describes a way to bake the coupler directly into the multiple layers of the printed circuit board (PCB) itself, using precisely arranged copper traces stacked on top of each other through tiny vertical connectors called vias.

The result is a coupler that doesn't need its own dedicated chip or surface space. The measuring function is essentially hidden inside the board, which matters a lot as phones keep getting thinner and their insides more crowded.

How the signal lines stack across three PCB layers

The patent describes an electronic device — a phone or similar gadget — where the PCB contains two signal lines running in close physical proximity across three separate layers of the board.

The first signal line is the main path: RF (radio frequency) signals travel through it between the wireless communication chip and the antenna. The second signal line is the sensing path: because it runs so close to the first, it electromagnetically picks up a small sample of the passing signal — a phenomenon called inductive coupling (think of two wires running parallel; energy bleeds between them).

The clever part is the geometry. The patent specifies exactly how the two lines sit relative to each other across the three layers:

• On the top layer, both the main line and sensing line start from their respective ports and run alongside each other.
• On the second layer, the main signal line continues, connected down through a via (a tiny drilled hole filled with metal that connects board layers).
• On the third layer, the sensing line's lower segment runs, also connected via its own via — but positioned so it overlaps with parts of the main line when you look straight down through the board.

This overlapping-but-offset arrangement is what makes the coupling predictable and compact. The sampled power is then read by a power detection circuit, which tells the device whether to dial the transmit power up or down.

What this means for antenna tuning in Samsung devices

Controlling transmit power precisely has real consequences for you: it's one of the main levers a phone uses to extend battery life during calls and data sessions, and it's also tied to regulatory limits on how much radio energy a device can emit. A more compact, accurate coupler means the phone can react faster and more precisely to changing signal conditions.

For Samsung's engineering teams, embedding this function into the PCB stack rather than as a discrete component frees up board space — a constant pressure as flagships add more radios (5G sub-6, mmWave, Wi-Fi 7, UWB) into the same shrinking footprint. This is infrastructure-level work, not a headline feature, but it's the kind of patent that quietly underpins device performance across an entire product lineup.

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