What is Ultra-wideband? A guide to UWB

Ultra-wideband is a short-range, high bandwidth wireless technology that offers precise positioning and tracking and highly secure communications. It has become increasingly popular in light of its implementation in various mainstream devices. This relatively new tech used in Apple’s AirTag and BMW’s Digital Key Plus has driven curiosity from companies worldwide that could benefit from its features.

UWB serves as a solution to poor position accuracy with other network types such as Bluetooth, and has helped revolutionise the way in which we can locate and measure distances using wireless technology. The smartphone and automotive industries are just a few of the many that can benefit from the speed and accuracy of UWB connectivity in the near future.


How does Ultra-wideband operate?

Ultra-wideband (UWB) uses radio waves over a wide frequency bandwidth for short-range applications, with the term wideband being directly related to the 6-9GHz range of the spectrum. UWB is a direct connection between two devices that consists of radio wave bursts being transmitted and received; the amount and time it takes for these pulses to travel between the devices is then translated into data.

UWB can achieve accurate distance measurements in real-time without interfering with conventional narrowband and carrier wave transmissions in the same frequency bands. It is also resistant to noise and reflection, making it secure and suitable for a range of applications.

Other wireless communications that use radio waves like Bluetooth and Wi-Fi are less accurate than UWB as they determine distance by signal strength and arrival. For UWB to function effectively it requires antennas with small ground planes, which enables compact designs and applications.

Ultra-wideband frequencies

Incorporating UWB into the design of devices can vary depending on region. As it occupies such a wide frequency band spectrum, there is a possibility that UWB can interfere with other telecommunication services occupying the same frequencies.

The Federal Communications Commission (FCC) of the United States has allocated a band covering of 7.5 GHz (3.1GHz to 10.6GHz) for the unlicensed use of UWB applications. In Europe, the Electronic Communications Committee (ECC) has allocated various frequency ranges of 3.1GHz – 4.8GHz, 6GHz – 8.5GHz, and 8.5GHz – 9GHz across most countries in the region. Other regions and countries vary in permitted frequency bands which must be taken into account when implementing UWB antennas into any design.


What are the benefits of Ultra-wideband?

Precision tracking capabilities

The accuracy of ultra-wideband is unmatched by any other wireless technologies at short distances. The lack of interference with other radio transmissions means ultra-wideband is able to effectively measure distances with an accuracy of up to 1cm. Comparatively, Wi-Fi and Bluetooth connections have an accuracy of approximately 10 metres on average without being obstructed. UWB’s efficiency, bandwidth and accuracy open up a world of possibilities for devices that function at a short distance.

High reliability

The wide frequency band range of 6-9 GHz enables clear communications without interfering with devices on more commonly used frequencies. Furthermore, the pulse transmission characteristics of UWB means they do not interfere with conventional narrowband and carrier wave transmissions in the same frequency band. Both of these factors enable reliable connectivity and pinpoint accuracy.

Secure communications

UWB’s pulse transmission technology is resistant to noise and reflection, making it secure and reliable. The direct connection between two devices and precise measurement properties means that UWB can connect and authenticate the legitimacy of a device in real-time with the radio waves being unable to be recorded or relayed over. This makes it the perfect choice for applications that require security such as car key authentication in the automotive industry.

What are the applications of ultra-wideband?


Big automotive brands such as BMW are already incorporating UWB connectivity into their designs. The precise distance measurement offered by UWB can be integrated into physical or digital car keys that interact with a vehicle based upon proximity. A user can walk up to their car and unlock it without ever needing to remove the key or smartphone from their pocket. UWB also offers an extra layer of security as their radio signals cannot be recorded or relayed over and is separate to other wireless connections. This makes it far more secure when compared to other digital keys that use different protocols.

Smartphone devices

UWB is unparalleled when it comes to precise device-to-device communication. Smartphone brands have recently been harnessing this precision with sharing and locator services. Samsung and Apple have both released tagging applications that enable users to locate  small UWB tag devices with extreme accuracy. The high bandwidth of UWB also makes it useful for close-range data transfer and is already being incorporated into a number of smartphone designs.


The frequency range, accuracy and low power consumption of UWB makes it a possible and effective choice for a range of medical applications. As the radio waves can penetrate human tissues without any side effects, UWB radar is a safer alternative to X-ray imaging whilst achieving accurate in-body images of patients. Wearable sensors using UWB can also be used to provide precise, real-time vital parameter measurements of patients. These applications are still being researched and could see real-world implementation in the near future.


Key design considerations for Ultra-wideband

Due to the varying applications and wide frequency spectrum UWB operates on, it can be difficult to integrate into a design. To help improve adoption of the application of UWB technologies and antennas, a consortium of leading brands has been created by FiRa. The consortium consists of leading companies such as Samsung, Google, Apple and more, and is leading the way in creating an industry ecosystem where the integration, specification and deployment of UWB technologies are simpler and more streamlined.

Antenova offers a wide range of resources on antenna selection and placement that can help streamline the process of UWB integration for your device design. To find out more about how UWB can benefit your design, visit our resources centre.


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