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Are RF shields necessary?
One of the requirements for FCC approval is RF shielding for intentional radiators. In other words, if your thing does wireless it needs a metal ‘can’ over the top of the design to reduce the amount of spurious RF noise. Additionally, the shield protects against incoming RF radiation from other devices.
How do you shield RF?
Aluminium. Aluminium is a versatile component when it comes to RF shielding. It can be used as a foil to block low frequency radio fields or it can be integrated in the construction to offer a built-in shield against radio frequencies.
How do I block all RF?
Thin amounts of plastic wrap, wax paper, cotton and rubber are not likely to interfere with radio waves. However, aluminum foil, and other electrically conductive metals such as copper, can reflect and absorb the radio waves and consequently interferes with their transmission.
When do RF devices fall under FCC rules?
When electronic-electrical products are used for providing RF energy for other than telecommunications applications, such as for the production of physical, biological, or chemical effects, such as heating, ionization of gases, mechanical vibrations, and acceleration of charged particles, these devices fall under the FCC rules 47 CFR Part 18.
Do you need a shield for a radio transmitter?
The radio elements of the transmitter must be shielded. There are a few parts that are permitted to be external to the shield such as PCB antenna (if that’s the type you’re using) and tuning capacitors. But for the most part, all components associated with your transmitter should be housed beneath a shield.
Do you need equipment authorization for a RF device?
A product may contain one device or multiple devices with the possibility that one or both of the equipment authorization procedures apply. An RF device must be approved using the appropriate equipment authorization procedure before it can be marketed, imported, or used in the United States.
Are there receive only or transmit only RF modules?
There are receive only RF modules and transmit only RF modules, but because most implementations include transmit and receive, that’s what we’ll be covering in this post. Two of the most widely used RF modules are bluetooth modules and wifi modules. But, almost any transmitter can be a wireless module.