Samsung Patents an Antenna System That Treats Both Halves of a Foldable Phone as One

By Patentlyze Team · Updated Jul 24, 2026

When you fold a Samsung phone in half, the two halves end up facing each other, and that's normally a problem for the antennas inside. This patent describes a way to turn that physical overlap into a wireless advantage instead.

How Samsung's folding phone antenna actually works

Imagine your phone folded shut, the two halves pressed face-to-face. Both halves contain a small antenna, and when they're stacked on top of each other like that, they can interfere with each other and hurt your signal quality. That's a real engineering headache Samsung has been chasing since foldable phones became a product category.

This patent describes a system where both antennas are deliberately coordinated rather than left to fight each other. A small chip called a phase tuner watches the timing of the radio signals going to each antenna and nudges them so they stay in sync. When both antennas pulse together in a controlled way, they can actually reinforce each other instead of canceling out.

Think of it like two speakers playing the same song. If they're slightly out of time, you hear a muddy mess. If they're perfectly synchronized, the sound is fuller and clearer. Samsung is applying that same logic to the radio signals inside a folded phone.

How the phase tuner keeps the two antennas in sync

The patent describes an electronic device (clearly a foldable phone) with a housing that folds via a hinge, creating two halves: a first housing with its own conductive antenna section and a second housing with another.

The key component is a phase tuner, a circuit that sits between both antennas and a single radio frequency integrated circuit (RFIC), the chip that actually generates and receives wireless signals. The phase tuner connects to a specific point on each half's antenna and adjusts the phase (the timing position within a radio wave cycle) of the signal sent to each antenna.

When the phone is folded shut, the two antenna sections directly face each other. In most designs, that causes signal cancellation because two radio waves arriving slightly out of sync can destructively interfere. The phase tuner's job is to close that timing gap, keeping the difference between the two signals within a controlled range so they work together rather than against each other.

In practical terms, this lets both conductive portions of the phone's frame act as a coordinated antenna pair, rather than forcing engineers to pick one half and essentially mute the other when the phone is closed.

What this means for foldable phone signal quality

Foldable phones have a structural disadvantage: the hinge creates two separate metal frames, and fitting useful antennas into both while keeping them from interfering is one of the harder radio-engineering problems in consumer devices. Most current solutions involve routing signals over longer cable paths or simply accepting reduced performance in the folded state. Samsung's phase-tuner approach treats the two halves as a coordinated antenna pair, which could mean better call quality and data speeds when the phone is closed and fits in your pocket.

For Galaxy Z Fold and Z Flip users, this is the kind of invisible infrastructure improvement that never gets a headline at an Unpacked event but does show up in whether your phone drops a call in a crowded area. If this approach makes it into production hardware, the folded form factor would carry less of a signal penalty than it does today.

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