RF Shield Box: Selection Guide, Applications & Manufacturers

RF shield boxes provide electromagnetic interference (EMI) protection for RF testing. Key factors for its selection include attenuation level, shielding material and size.

What is an RF Shield Box?

The box made of copper, aluminum, or steel to provide shielding from radio frequency waves or EM waves is known as an RF shield box. It is used to perform compliance testing of wireless devices under rigid environmental conditions. Metal strips, metal screens, and metal foams are also used to provide shielding from unwanted EM (Electromagnetic) waves during product development.

Selection Guide

When choosing an RF Shield Box, consider the following key parameters:

• Shielding Effectiveness: The box should provide high attenuation (about > 80 dB) to effectively block external RF interference.
• Frequency Range: Ensure it supports the required frequency spectrum.
• Internal Space & Form Factor: The size should accommodate the DUT (Device Under Test) and allow for proper placement of test probes and accessories.
• Connectivity & I/O Interfaces: Look for shielded RF connectors, USB, Ethernet, power supply pass-throughs, and fiber optic interfaces as needed.
• Ventilation & Heat Dissipation: Essential for testing high power RF devices to prevent overheating during extended testing sessions.
• Automatic or Manual Operation: Some shield boxes offer automated control for production testing, while others are manually operated for lab use.
• Material & Build Quality: Ensure it is made of high quality RF absorbing materials such as aluminum or steel for durability and effectiveness.

Applications of RF Shield Box

Following are some of the benefits of RF Shield Box:

1. Device testing: Used for testing smartphones, IoT devices, Wi-Fi routers, and Bluetooth modules in an interference-free environment.
2. Network Testing: Ensures accurate performance measurement of 5G, LTE, and mmWave communication devices.
3. EMI/EMC Compliance Testing
4. Provides a controlled RF environment for measuring the performance of antennas, RF front-end modules, and RF transceivers.
5. Automated Production Testing

Manufacturers of RF shield box

The following table lists popular manufacturers or vendors of RF shield boxes.

Conclusion

A well-designed RF shield box enhances EMI protection. Select from leading manufacturers for reliable performance.