For a USB dongle product which plugs into a Notebook, what type of SAR testing would be required? Is testing for the bottom and outer edge positions for the conservative consideration sufficient enough for CE SAR testing? Or do we just need to perform the SAR on the bottom position?

Based on the EN 62209-2 standard, the device should be positioned so that the peak SAR can be measured. The manufacturer’s intended use configuration needs to be considered for the device implementation. The test configurations you mention which is the bottom of the USB and the outer edge of USB would need to be included in the SAR evaluation. Additionally the user facing side of the USB would also need to be included in the assessment as well for R&TTE requirements. A USB device manufacturer would need to take into account that usb ports may be located on different sides of tablets or laptops and in different orientations, either horizontal or vertical receptacles. These variables related to the end use configuration forms the reasoning for assessment being carried out on all of the faces of the USB modem. Typically we would advise the USB device is tested with a modern laptop, similar to the FCC compliance methodology. One approach is to carry out area scans on the applicable sides of the USB to determine the worst case exposure position and then a full scan on the worst case side. That approach would be taken for each frequency, ensuring that each modulation and mode is considered in the test plan. If the USB dongle has a swivel function such that the antenna can rotate, there are additional considerations included in the EN 62209-2 specification.

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