Feature: RF
Integrating radio modules with regulatory requirements
By Matthew Russell, Chief Engineer (RF), TÜV SÜD I
ntegrating a pre-certified radio module that adds wireless capability to a larger device is a cost-effective way to get products to market quickly. However, while using a pre-certified wireless
module minimises design time and compliance costs, it is vital to check that the module is certified for the countries where it is intended to sell as a final product. If not, additional testing on the host product may be required to cover additional markets. There is an enormous range of wireless
modules to choose from but ‘buyer beware’, as they are not all equal. If you make the wrong choice of wireless module at the design stage, there may be significant consequences further down the line in the form of non-compliance. For example, a need to redesign a product will result in increased costs and time to market delays. Also, if you modify a wireless module or use it outside of the specification for which
it has been tested and certified, then you may also face additional testing and certification requirements. It is therefore essential to do thorough research and due diligence before selecting the module to integrate into your product.
Europe and North America differ in their approval approaches North America Tere is no specific reference to the word “modules” in European legislation, whereas the Federal Communications Commission (FCC) in the US has clearly defined what a module should be, and has a formal certification procedure in place. Title 47, Part 15 of the Code of
Federal Regulations (CFR) governs unlicensed RF devices. It sets limits on electromagnetic emissions from devices that aren’t operated by licensed users to prevent harmful interference with other systems. Tis includes everything from unintentional radiators in digital devices like computers and other electronics,
14 July/August 2025
www.electronicsworld.co.uk
to intentional radiators such as low- power wireless devices. Tis means that nearly every electronic device sold inside the US that radiates either intentionally or unintentionally, must be reviewed to comply with Part 15 before it can be sold in the US market. Part 15.212 includes eight specific guidelines for certification requirements: 1. Radio elements must have their own shielding.
2. Te modular transmitter must have buffered modulation/data inputs (if such inputs are provided).
3. Te modular transmitter must have its own power supply regulation.
4. Te modular transmitter must comply with specific antenna and transmission system requirements.
5. Te modular transmitter must be tested in a standalone configuration.
6. Te modular transmitter must have a permanently affixed label with an FCC identification, or be able to electronically display it.
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