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Downgrading Your Spec Does Not Make a Quality Tag – Thoughts About RFID Quality

Jul 08, 2016

中文版 Chinese version

I work as the CEO of Voyantic, a company that specializes in RFID test and measurement equipment. Since our systems are used by hundreds of companies around the world, we often come across cases where a customer needs our help to verify that their tags work as they should. This is a story about a case where things went wrong.

Tagging Athletes in Cross-country Skiing

We got involved with a very interesting case a couple of years ago. A small RFID integrator that we have known for some time wanted to tag athletes in a cross-country skiing competition. The idea was to use RFID for timing the race. And you can guess that if someone spends several hours on the ski track, being left without a race time is definitely not an option.

Cross-country skiing is a healthy hobby and also a good application for RFID timing – Photo by Sorbis / Shutterstock.com

There are many different ways to tag athletes in timing solutions. Common approaches in running competitions include integrating the RFID tags to the race bibs or attaching them to the shoes of the runners. However, in this case, the chosen approach was to buy wrist-band tags and to attach them to the ankles of the skiers. The tags were read by fixed readers that were set up on the side of the tracks.

The integrator went through the specifications of several different wrist-band tags and finally contacted a fairly well known maker of specialty tags for some samples. The samples arrived the following week, and the integrator ran some field tests. Everything worked well. He was able to detect every skier that passed the reader antenna.

So the integrator decided to order the tags that he needed for his application. Once again, there was a timely delivery of correct amount of tags. However, when he started to build the application, he noticed that not all of the tags were working. A typical discussion between an unsatisfied customer and a worried supplier followed.

The conclusion was that all the supplied tags worked according to the specification.

The tag manufacturer tested both working and non-working tags attached to the wrist of whoever they considered to be their standard-human. All tags were readable from a distance of 2 m which was the specification. But they didn’t all work in the end application. How is this possible?

Analysis

We got involved with the case at this point. We were asked to take a look at the tag samples to try to understand what was going on. So we ran a performance test for the tags using the Tagformance measurement system. The results from the Threshold Sweep measurement are shown below.

Performance variations of wrist-band UHF RFID tags measured with the Tagformance system

We tested the tags in free air, so they were not attached to a wrist or an ankle. But even in this setup it is clearly visible that there are significant variations in the tuning and performance of the tags. So this is what we think happened:

  1. The integrator decided to use the tags differently from what the manufacturer had specified
  2. The first samples sent by the tag manufacturer performed clearly above the spec
  3. The integrator concluded that this tag will work in the application
  4. The next tag batch – even though still within the original spec – performed differently
  5. A part of the tags didn’t work.

So, it is very hard to point fingers in this case. But there is something that the RFID industry needs to improve in. The industry is already doing a decent job in reporting the performance of their tags, e.g. in expected read range. But I think there is a lot to improve in how performance variations are reported, because that is a key factor in building reliable RFID systems.

And what happened with the skiing competition? Did the integrator get the system to work? He did. But he had to manually test through the tags and hand-pick the ones that worked well enough. Hardly a perfect outcome but every skier got their time.

My company Voyantic specializes in test and measurement solutions for the RFID industry. Are you interested to learn more about RFID quality control? Download our sample quality test report and contact us.

White Paper: How to Minimize Quality Variation in RAIN RFID and NFC Smart Label Manufacturing

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RFID, Love or Die

Apr 21, 2016

Dear reader, my name is Lluis Bueno, and I love RFID. Do you? I belong to the Spanish company NextPoints, and in my work I have met hundreds of professionals and companies working in the RFID market without any passion for the technology… and most of them are not working in the RFID market anymore. So, why is love required for RFID business to survive? Let me share a few real stories with you.

Without any doubt, RFID is living its best moment: Internet of Things is more real than ever, RAIN RFID Alliance has more than 100 members, GS1 released TIPP guidelines for RFID tagging in retail, RFID inlays reached the lowest price ever without losing any quality… but perhaps, even with this friendly environment, the RFID company you created or joined some time ago is not alive anymore.

What was the reason for failure then? All of them had something in common: their lack of love towards the technology. Focusing on the product is of course important, but prioritizing price and forgetting collaboration with other players did kill them.

RFID is not just one more technology, it still needs your support to develop the market, and you need the market to be developed to make business.

RFID has its professional tools and methods of doing measurements, and this is something many of the professionals in the market are not aware of. There are only two ways to work with RFID: the right way or the wrong one, and there is no midway. Fortunately, I met Voyantic years ago and they showed the right way to me. Doesn’t it sound like some kind of religion? That was exactly what I felt the first time I met Mr. Juho Partanen: I had always thought I was doing things, if not the best way, then good enough for my RFID business. But I was doing wrong until he opened my eyes and he led me on the right track.

Most of the RFID companies ─ large end users, system integrators and even manufacturers of RFID readers or tags ─ are still using the same methods for testing their products and solutions which they used 5 years ago: conventional readers instead of professional testing systems, trial and error instead of real measurements, empirical reading distance instead of other key measured parameters. They think they are getting enough information from those old methods to understand how RFID works, but they really have no idea of what is happening. Why are they not taking their own business seriously? Is lack of budget the reason? No. Lack of love towards RFID is.

Most of the RFID companies think that purchasing RFID products at the best price will turn their company into a successful one. Forget it! Price just helps. Qualified partners, not only products but business providers, RFID alliances involvement, real RFID measurement tools…. You are missing much more aspects than just price. Are you aware of the changes in RFID ETSI frequencies, TIPP guidelines, RAIN RFID Alliance…? Information, commitment, involvement… definitely, love. Love is missing all along the supply chain, so we need to spread love since the beginning.

Please, you have chosen RFID as a driver technology for your projects, products and solutions. Love it and it will love you back with everlasting business. Take it seriously, or partner with companies who take it seriously for you, but do not ignore RFID and treat it as any other technology or it will die and make your business pass away.

In my work I have heard dozens of questions of RFID – why is it not performing as expected? What should be done differently to make my RFID business bloom? Download the “Questions of RFID – Loving Wisdom” document below to read the commonly asked questions with my answers.

Download Lluis Bueno’s RFID Q&A!

Download Lluis Bueno’s loving wisdom for frequently asked questions of RFID. You’ll find answers to many baffling RFID questions regarding tag and reader selection, system setups, link margins, and troubleshooting.
For your convenience, many of the answers come with pictures, too!

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The Pioneers of UHF RFID: The Aerospace Industry

Nov 06, 2015

中文版 Chinese version

Retail RFID seems to get the most limelight in the RFID industry at the moment. And that is not surprising because of its huge tag volumes and growth rates. But many other sectors are benefiting from RFID use as well. One of my personal favorites is the aerospace industry.

The aerospace industry has been one of the pioneers in UHF RFID use

The most visible aerospace company in the RFID space has been Airbus. Their announcement, at the beginning of this year, to ask their supply base to tag all traceable items with passive RFID shows that they are serious. But also Boeing and Embraer come across regularly in RFID related news. To serve this industry, an ecosystem of RFID technology providers has emerged. Companies such as Fujitsu, Maintag, Tego, OAT Systems, and Brady, to name a few, have a special focus in aerospace RFID. Besides, the ecosystem has generated business opportunities for the supporting industry, see, for example, the Stanley Black & Decker success story.

What is Required from RFID in Aerospace?

So why are some RFID companies specializing in the aerospace industry? Can’t we just buy a roll of RFID labels and start tagging airplane parts? Well, it is not quite as simple as that. Several aspects set aerospace RFID, apart from many other application areas:

  1. Large memory required: The aerospace industry requires that a lot of information (birth records, maintenance records, etc.) is stored directly into the tag. They don’t want to rely on a connection to an external database which is usually used in retail RFID.
  2. Valuable items: The tagged items are of high value and are often used for ten years and more. As a result, tag durability is more important a driver than tag cost.
  3. Harsh conditions: Tags in and out of an airplane need to endure vibration, significant variations in temperature, humidity, and pressure, and many other conditions unfamiliar to retail applications.
  4. Global functionality: As airplanes frequently cross country borders and oceans, the RFID tags need to be readable around the world. As a result, the tags must be designed to be wideband.
  5. Less sensitive tag ICs: Due to their larger memory content and possible special functionalities, the tag ICs used in aerospace typically need more power. As a result, many applications are limited to read ranges of 15 cm to 3 meters.

A Need for Standards

The aerospace industry realized that they need standardization for flyable tags as early as 2006. That is when a group of experts in the field decided to develop a standard under SAE International. SAE AS5678, “Passive RFID Tags Intended for Aircraft Use” was born. The standard includes a broad set of different environmental tests to make sure that a tag would endure the harsh conditions of a flying airplane. Sun APT Test Center was the first lab to start certifying tags according to the standard.

In addition to environmental testing, the standard also describes RF performance tests for the tags. The standard described a very professional and well repeatable measurement methodology. But even more interestingly, the standard divided tag performance into performance grades, somewhat similar to what the GS1 TIPP standard would do for the retail industry in 2015.

AS5678 was truly ahead of its time.

As a result, an airplane manufacturer could simply require a grade B tag to be used by its suppliers without having to specify the tag model or detailed performance parameters.

AS5678 performance tests are typically performed in a small anechoic chamber

Now, in 2015, SAE is revising the AS5678 standard to reflect the new information gained during the years. I have been a member of the team, revising the standard as well. The changes, however, are not very large, which well reflects the quality of the first standard version.

Specific RFID Testing Needs of the Aerospace Industry

The special requirements of the aerospace industry for RFID lead to some specific testing needs:

  1. Measuring tag performance: Because of the large memory contents, wide bandwidth, and rugged design, aerospace tags may have limited read ranges. The AS5678 test methodology can be used to determine the acquired read range and the matching performance grade.
  2. Verifying tag bandwidth: Since a wide bandwidth is required, the performance of the tag needs to be tested typically throughout the 860-960 MHz frequency range.
  3. Environmental tests: AS55678 describes a large set of environmental conditions that the tag needs to endure. The performance of the tag should not degrade during the tests.
  4. Memory testing: The memory of an aerospace tag is organized differently compared to a typical label. As a result, there is a need to have good visibility to the tag memory contents.

My company Voyantic has delivered test and measurement systems for both end-users and technology providers in the aerospace RFID industry. The systems promote design and manufacturing excellence, as well as fluent technical dialogue between pioneering companies within the industry.

If you are interested to learn more, please download our application note below or contact us, and let’s talk more!

Learn How to Test UHF RFID Tags in the Aerospace Industry

Download The Essential Guide for UHF Tag Testing in Aerospace

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Avoiding the Next RFID Hype Rounds by Learning from the Past

Oct 22, 2015

Omni-channel retail, pharma serialization, internet of things, M2M, NFC – the world never runs out of buzz words that get us all worked up and excited. Then come to the budgeting rounds, and so many again overestimate the next year’s revenue growth, setting the sails towards the future disappointment. What is so tricky about it – how to see the forest from the trees?

I would keep my nose directed forward but also take care to learn from the past. Read on to grasp some of the past mistakes.

As we look back at the strange days of the tremendous RFID hype in 2004-2007, one can only shrug and shiver. Can you remember the factors that drove up the inflated expectations curve ten years ago? I was a rookie in the RFID business in 2004 and couldn’t tell which were major and minor industry drivers. Now the following themes become highlighted as I try to make sense of the past.

Royalty-free ISO Standard Makes Your Day

In 2004, the Class 1 Gen2 was ratified by EPCglobal. As no patent constraints had been found, the EPC Gen2 standard was also declared royalty-free by EPCglobal. The significance of Gen2 was manifested in 2006 as the International Standards Organization ISO approved it as a part of the 18000-6 standard. Class 1 Gen2 fixed many shortcomings of the original Class 1 and 18000-6B standards, and this global standard certainly paved the way for a smoother ride for the industry.

Do NOT use this switch!

Wal-Mart flipped the hype boost to overdrive with its announcements in early 2004 for the top 100 suppliers to tag pallets and cases by January 2005. This drove the whole RFID industry, and those around it, practically insane. If Wal-Mart was doing this, wouldn’t this drag the other retailers to do the same? Also, venture capitalists woke up and became fully alarmed not to miss the train. Money started pouring in RFID companies that were set to make millions in the Wal-Mart ecosystem alone, had short or non-existent revenue history, a few patents perhaps, and a bullish burn rate. It was a roller-coaster ride during which marketing agencies, lawyers, and event organizers must have made big dollars.

Go Only with a Solid Standard

By 2007 nothing much had happened. One central cause for Wal-Mart not getting ROI in their RFID expedition was the timing related to standards – the transition from Class 1 to Class 1 Gen2 took a long time and effort for the technology vendors, which also had other worries to handle. As Wal-Mart gradually began to pull back on RFID and Nasdaq started to slide, it was clear that most RFID companies were firmly headed towards the biggest hangover of all times. RFID hype had peaked, and burst, too.

Healthy Competition, or Something Lurking Behind the Scenes

One thing the investor money managed to get done was to destroy the profit margins in UHF RFID. Even the few good looking companies in RFID were nearly pushed over the edge by their revenue-hungry-investor-backed competitors that sold their goods probably at a below-zero profit. As technology was still immature and quality standards non-existent, the door was open for low-quality and no-quality vendors that gradually ate off the left-over positive karma around RFID. End users learned to be cautious and consider quality aspects as well, which now at the later time has turned into a competitive advantage for companies that have quality processes well established.

2008 to 2010 were terrible times for everyone. I can imagine how so many sales funnels had steadily forward surfing high-rise edges. As the pressure eased off just slightly, then came December of 2011 and Round Rock. That horrid battle took long and was mostly fought behind the scenes. I feel lucky for not knowing all the details, but the dispute did plenty of harm! Among other casualties, the Impinj IPO was scrapped in 2012, but at the same time, Smartrac was awake and managed to execute some significant acquisitions. The one universal splendid outcome from Round Rock was the fact that RFID companies learned to co-operate in the name of a greater common good.

Less Hype, More Industry Collaboration

There may be a time to go solo – but not now

We arrive at the present day – RFID hype is long gone, technology has matured, and studies clearly show how the RFID adoption is streamlining processes, bringing ROI and making the world a better place. Omni-channel retail, lean manufacturing, passive sensors, and expanding industry collaboration, such as the RAIN Alliance and GS1, are some of the drivers that bring more and more business to the technology vendors and solution providers.

The future of the RFID market looks set to continue at double digits rate growth. I do not see any unjustified hype on the horizon as of now. If only the RFID industry would be able to avoid the next pitfalls, such as new patent disputes, proprietary national protocols, and especially the IoT hype. In general, I feel optimistic over all this; however, having been an entrepreneur for over ten years, I won’t be surprised.

Do let me know if your crystal ball reflects the future any differently, and with more clarity! Send me an email (juho.partanen@voyantic.com) and let’s talk more!

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