This high-performance millimeter-wave antenna coupler is designed for 5G mobile communication systems, with a focus on close contact with the measurement object. By optimizing coupling characteristics and reducing VSWR disturbance during total reflection, it improves the EVM (RMS) value, making it highly effective for OTA measurements. Available models include the 24 GHz to 29.5 GHz and 24 GHz to 43.5 GHz versions, with a total of four models in both large and small sizes.