What affects real world RF performance?

RF is sometimes seen as a kind of "Black Magic", where things behave in some mysterious unfathomable way. In other cases, it is treated like just an add-on to standard digital electronics with little special attention needed. The truth is, RF follows predictable rules, but it is a fundamentally analogue world, and subject to a number of subtle effects and behaviours.

The EU Cyber Resilience Act (CRA) came into force on 10^th December 2024, with a 36 month period permitted for its previsions to be implemented. We are now roughly halfway through that implementation period, so time is getting short to ensure product compliance. The obligation to report “severe incidents and security breaches” starts even sooner, being required from September 10^th this year.

When the Bluetooth 6.2 specification update was announced, most of the attention seemed to focus on Channel Sounding as the hot new technology now available with Bluetooth devices. As a result the other new features slipped by under the radar. This article looks at the Short Connection Interval feature of the update; what it is, and why it can be useful in real world applications.

Many of the demonstrations of Bluetooth Channel sounding seen at Expos or other similar event have used Multiple Antenna solutions (MIMO). This has been promoted as giving the most accurate result, which is true, but not quite the whole story.

Early IOT devices were typically based on quite simple architectures. Typically, they would incorporate a simple microprocessor, a sometimes separate radio chip (often Bluetooth Low Energy), and some sensors; their only function would be to gather some data and transmit it onwards to other systems. Since then, IOT devices have developed enormously in terms of performance, features and sophistication. This article looks at these trends and what the future holds.  

Personal Protective Equipment (PPE) encompasses a wide range of products, and many of the most common and useful are in the low tech category, such as the humble hard hat or face mask. Such products are low cost and effective. However technology based solutions are supplementing simple physical protection to an increasing degree. 

The Artificial Intelligence revolution is well underway. We actively use AI via services like ChatGPT, DeepL natural language translation services and the “Assistants” in the latest phones, smart speakers and photo editing services. We are also  passive users when we interact with many entities via phone or online services, with AI being used at least to control and filter the first stage of interactions.

Keys are an invention so ancient that we don’t even think of them as a technology. The earliest lock and key mechanisms date back to ancient Egyptian times, with the ancient Romans introducing metal keys like the mortise locks of today. Nevertheless, key technology has continued to evolve, and there has been an increasing trend towards digital key technologies over recent years.

Bluetooth Low Energy has established itself as one of the most successful communication technologies over the 15 years of its existence. Arguably it was the technology that launched the IOT revolution. However, whilst its success in the domain of low power data transfer is undisputed, attempts to use it as a locating technology have had a mixed record. The new Bluetooth Channel Sounding specification promises to deliver more precise locating technology than the existing Bluetooth beacon and Bluetooth Angle of Arrival technologies.

Wearable devices generate unique challenges for radio communications. Radio solutions are designed for the “default case” of the RF component sitting on a PCB, mounted in a plastic box, with an air gap around the PCB, and an optimised keep out zone and ground plane. This is logical for an all-purpose design, but not for the typical wearable case, where the RF component is near the body, a strong absorber of microwave radiation, and space is at a premium. This article examines the challenges of RF wearable design and how to overcome them.