Ultra-Wideband Testing

• Testing for FCC, ISED, and ETSI: Most measurements are typically conducted using radiated tests with standard (non-modified) devices. Radiated testing is the standard method for these regulations.

• Conducted Measurements: Certain parameter measurements, such as bandwidth measurements, can be performed conducted. These tests generally require significantly less time than radiated tests. Therefore, especially when testing equipment (EUT) has multiple channels, having a modified device can help reduce overall testing time.

• Specific Requirements for Japan: In Japan, only conducted measurements with modified devices are allowed. Radiated measurements are not permitted due to high noise levels that exceed the allowable limits.

When delivering samples for testing, consider the following requirements:

• Continuous Modulation Mode: For compliance testing in all regions (FCC, ISED, MIC, ETSI), samples must be capable of operating in continuous modulation mode across all channels.

• Normal Operating Mode: For all portable UWB devices, a normal operating mode is also required. Additionally, a companion device is necessary to allow testing in this mode.

• Receiver Mode (ETSI and MIC Standards): For tests according to ETSI and MIC standards, a receiver mode is needed. In this mode, the EUT (Equipment Under Test) should wait for a signal from the companion device without transmitting any signals itself.

• Implementation Considerations: If feasible, implement the receiver mode so it can operate without requiring a companion device, as the presence of a companion device during testing in receiver mode may introduce additional emissions.

• Yes, it is important. The type of Ultra-Wideband (UWB) device—whether portable or intended for indoor use—significantly affects testing requirements.

• Stricter Limits for Portable Devices: For portable UWB devices, the FCC and ISED impose stricter limits. Additionally, a specific test, known as the transmission pause test, is required for these devices. The FCC defines a portable UWB device as "a small UWB device intended for frequent outdoor operation and capable of operating without fixed infrastructure."

• Indoor UWB Devices: If a UWB device is designed for indoor use, it must include a specific notice either on the device or in the accompanying user guide: "This device is intended for indoor operation only. Outdoor operation is a violation of 47 U.S.C. 301 and may result in serious legal consequences to the operator."

• Additional Considerations: Other key characteristics for indoor devices include their operation in conjunction with fixed wire networks and the absence of an internal battery, relying instead on AC or PoE (Power over Ethernet) for power.

• Yes, there are important differences. The radiated emission limits differ notably between FCC and ISED, particularly in the lower frequency ranges.

• ISED (RSS-220) Limits: For ISED in Canada, the radiated emission limit is set at -70 dBm for the frequency range of 1610 MHz to 4750 MHz.

• FCC Limits: For FCC in the United States, the corresponding limit is -41.3 dBm for the frequency range of 3100 MHz to 10600 MHz for handheld and indoor equipment.

• Practical Implications: Due to the stricter limits under ISED, it is nearly impossible to operate UWB devices in Canada within the frequency range below 4750 MHz.

When selecting a lab for testing your Ultra-Wideband (UWB) equipment, consider the following key factors:

• Spectrum Analyzer Capabilities: The FCC requires that peak power is measured within a 50 MHz bandwidth. Therefore, the lab must have a spectrum analyzer capable of measuring with a resolution bandwidth (RBW) of 50 MHz. While there is an alternative method for measuring with a lower RBW, labs that rely on this approach without the proper equipment often struggle to obtain accurate power measurements. This can lead to testing delays and may necessitate transferring the project to a lab with the appropriate equipment.

• Low Noise Amplifiers and Antennas: The lab should be equipped with a range of low noise amplifiers featuring high gain and low noise figures, as well as a variety of antennas with narrow frequency ranges and high gain. Relying on a limited selection of antennas or amplifiers with suboptimal parameters is typically insufficient for most UWB projects.

For the testing of all devices, we require a detailed test instruction. Additionally, we recommend creating videos that demonstrate how to properly set the Equipment Under Test (EUT) into the correct operation mode. When the EUT is thoroughly prepared for testing, we can conduct all tests without requiring your physical presence.

If any issues arise during testing, we will address them using remote control software (e.g., TeamViewer) and video calls. Rest assured, all tests can be completed without the need for you to be on-site.