Synzen Develops Internal Antenna Solution for Fully Enclosed Metal Devices

Taipei, Taiwan — Metal enclosures are supposed to kill signals. That’s the whole point of a Faraday cage. But Synzen Precision Technology (SPT) has flipped the script — with a patent-pending (USPTO) antenna that turns the cage into part of the solution.

The Faraday cage was originally designed to keep electromagnetic signals out. But SPT has found a way to make it radiate instead — with an antenna that performs inside fully enclosed metal housings. Instead of fighting the shielding effect, SPT’s design transforms the metal enclosure itself into a radiating element, enabling reliable wireless performance where previously there was little — or none. Fully enclosed. Fully functional. No external antennas required.

This isn't a workaround. It’s a reimagining. By embedding a tuned element on the PCB and coupling it to the enclosure, SPT has created a high-efficiency, patent-pending solution that challenges decades of RF convention — and opens up new possibilities for device designers.

How It Works — Turning the Box into the Signal

SPT’s architecture uses a tuned element on the host PCB, which connects to the metal housing via screw, pogo pin, or spring pin. This coupling turns the enclosure itself into part of the antenna, radiating efficiently across key wireless bands — without compromising grounding or creating EMC noise.

Additional circuitry fine-tunes the element for optimal performance in Wi-Fi 7, 4G LTE, and 5G sub-6GHz applications. The result is a solution that’s compact, robust, and elegant — both electrically and mechanically.

“RF engineers have lived with this limitation for decades,” said Chris Tomlin, Chief Technology Officer at SPT. “Our goal was simple: stop fighting the enclosure and start using it.”

Why It Matters — Form Meets Function

Many RF designs still rely on external antennas or plastic windows to let signals out — sacrificing ruggedness, aesthetics, or both. SPT’s solution removes that trade-off entirely. Devices can now be fully sealed, tamper-resistant, and metal-clad without giving up connectivity.

Whether it’s a wildlife tracker hidden inside a metal collar, a telematics sensor buried in the undercarriage of a self-driving car, or a smart device welded into factory machinery and left untouched for years — this technology gives engineers the freedom to design boldly. No cutouts. No compromises. Just signal, even when it looks impossible.

Curious to Know More?

SPT is currently supporting early-stage integrations and welcomes conversations with design teams tackling tough RF challenges. If you’re working on a device where metal is non-negotiable, let’s talk.
Contact us at info@synzen.com.tw or visit synzen.com.tw

About Synzen Precision Technology (SPT)

SPT is a UK/Taiwan-based RF and antenna design house helping engineers around the world make better connections. Whether it’s compact surface-mount components or custom-designed systems, SPT builds clever solutions to hard problems — quietly powering some of the most ambitious connected devices in the world.