science

Near-field communication

Near-field communication is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Near-field communication rather than just read about it. In short: Near-field communication (NFC) is a set of communication protocols that enables communication between two electronic devices over a distance of 4 cm (1+1⁄2 in) or less. NFC offers a low-speed connection through a simple setup that can be used for the bootstrapping of capable wireless connections.

Key takeaways

Near-field communication belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Near-field communication to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Near-field communication from memory before moving on to harder problems.

Reference excerpt

Near-field communication (NFC) is a set of communication protocols that enables communication between two electronic devices over a distance of 4 cm (1+1⁄2 in) or less. NFC offers a low-speed connection through a simple setup that can be used for the bootstrapping of capable wireless connections. Like other proximity card technologies, NFC is based on inductive coupling between two electromagnetic coils present on an NFC-enabled device such as a smartphone. NFC communicating in one or both directions uses a frequency of 13.56 MHz in the globally available unlicensed radio-frequency ISM band, compliant with the ISO/IEC 18000-3 air-interface standard at data rates ranging from 106 to 848 kbit/s. The NFC Forum has helped define and promote the technology, setting standards for certifying device compliance. Secure communications are available by applying encryption algorithms, as is done for credit cards, and if they fit the criteria for being considered a personal area network.

NFC standards NFC standards cover communications protocols and data exchange formats and are based on existing radio-frequency identification (RFID) standards including ISO/IEC 14443 and FeliCa. The standards include ISO/IEC 18092 and those defined by the NFC Forum. In addition to the NFC Forum, the GSMA group defined a platform for the deployment of GSMA NFC Standards within mobile handsets. GSMA's efforts include Trusted Services Manager, Single Wire Protocol, testing/certification and secure element. NFC-enabled portable devices can be provided with application software, for example to read electronic tags or make payments when connected to an NFC-compliant system. These are standardized to NFC protocols, replacing proprietary technologies used by earlier systems. A patent licensing program for NFC is under deployment by France Brevets, a patent fund created in 2011. This program was under development by Via Licensing Corporation, an independent subsidiary of Dolby Laboratories, and was terminated in May 2012. A platform-independent free and open source NFC library, libnfc, is available under the GNU Lesser General Public License. Present and anticipated applications include contactless transactions, data exchange and simplified setup of more complex communications such as Wi-Fi. In addition, when one of the connected devices has Internet connectivity, the other can exchange data with online services.

NFC wireless charging (WLC) Near-field communication (NFC) technology not only supports data transmission but also enables wireless charging, providing a dual functionality that is particularly beneficial for small portable devices. The NFC Forum has developed a specific wireless charging specification, known as NFC Wireless Charging (WLC), which allows devices to charge with up to 1 W of power over distances of up to 2 cm (3⁄4 in). This capability is especially suitable for smaller devices like earbuds, wearables, and other compact Internet of Things (IoT) appliances. Compared to the more widely known Qi wireless charging standard by the Wireless Power Consortium, which offers up to 15 W of power over distances up to 4 cm (1+5⁄8 in), NFC WLC provides a lower power output but benefits from a significantly smaller antenna size (as small as 3 × 3 mm). This makes NFC WLC an ideal solution for devices where space is at a premium and high-power charging is less critical. The NFC Forum also facilitates a certification program, labeled as Test Release 13.1 (TR13.1), ensuring that products adhere to the WLC 2.0 specification. This certification aims to establish trust and consistency across NFC implementations, minimizing risks for manufacturers and providing assurance to consumers about the reliability and functionality of their NFC-enabled wireless charging devices.

… excerpt ends here. Continue reading the full article.

Illustrations

Logo of the NFC Forum

N-Mark logo for NFC-enabled devices

Worked examples

Example 1 — a first encounter with Near-field communication

Start with the simplest possible case. Write down what Near-field communication claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Near-field communication before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Near-field communication ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Near-field communication

In research: Near-field communication appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Near-field communication in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Near-field communication is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bandplans, Ecma standards, ISO standards, so understanding it makes those chapters shorter.
In everyday life: Look for Near-field communication outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Near-field communication in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Near-field communication means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Near-field communication out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Near-field communication in simple terms?

Why does Near-field communication matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Near-field communication?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Near-field communication.