An antenna coupler uses inductive coupling to transfer RF signals over short distances. It creates a magnetic field that induces a signal in the device under test. Because this process occurs in the near field, it limits unwanted RF radiation.

As a result, antenna couplers work well inside RF shielded environments and Faraday cages.

Why Antenna Couplers Are Used in RF Testing

Engineers use antenna couplers to test small wireless devices without direct cable connections. This method reduces signal loss and improves repeatability.

In addition, antenna couplers help prevent false failures caused by uncontrolled RF propagation.

Antenna Coupler vs Over-the-Air (OTA) Testing

OTA testing measures radiated performance in open or semi-open environments. In contrast, antenna couplers focus on near-field signal transfer.

Therefore, antenna couplers are ideal for early-stage testing, production testing, and shielded environments.

 Applications

Antenna couplers support many RF testing applications, including:

• Smartphones and tablets

• IoT and Bluetooth devices

• Automotive V2X modules

• Wireless production testing

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