How to Test and Certify Wireless USB Dongles?

Testing Methods for Wireless USB Dongle Transmitters

Wireless USB dongle testing is divided into three categories: "Simple Dongles," "Dongles with Rotatable or Rotating Connectors," and "Dongles with External or Rotatable Antennas." Details for testing are as follows:

I. Simple Dongles

A "Simple Dongle" refers to a USB dongle transmitter typically equipped with an internal antenna.

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According to KDB 447498 D02, the testing methods are as follows:

1. Testing Orientations:

 - (A) Horizontal Upward

 - (B) Horizontal Downward

 - (C) Vertical Front

 - (D) Vertical Rear

2. Testing Distance: 5 mm or less (the testing distance must be consistent across all modes).

II. Dongles with Rotatable or Rotating Connectors

These dongles can be connected to a host device in various orientations due to the rotating connector. When the antenna is built into the dongle, rotation can place the antenna in different positions.

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According to KDB 447498 D02, the testing methods are as follows:

1. Testing Orientation and Distance: Same as for Simple Dongles.

2. If the antenna is located within 1 cm of the dongle's tip, the tip should also be tested 5 mm away from the phantom in a vertical orientation.

3. For antennas within 2.5 cm of the USB connector, if the dongle can be positioned at an angle between 45° to 90°, testing in one or more such configurations may be required. A KDB inquiry should be submitted to determine the appropriate test configurations.

III. Dongles with External or Rotatable Antennas

This category includes dongles equipped with external antennas or rotatable antennas.

According to the TCB Workshop November 2019 RF Exposure Procedures, the testing methods are as follows:

1. Straight Antenna Mode: Test in both horizontal upward and horizontal downward orientations at a 5 mm distance.

2. If the SAR values for the two orientations are similar, perform additional testing in the horizontal upward orientation, with the antenna connected at a 90-degree angle and pointing downward, away from the phantom. Testing distance remains 5 mm.

3. If the SAR values for the two orientations are dissimilar, indicating asymmetry in the dipole antenna, additional testing is required in vertical front and vertical rear orientations. Testing distance remains 5 mm.

4. If the dongle has multiple independent rotating antennas, the above methods should be applied to each antenna.

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