In this blog post, we’ll explore the origins of RFID technology, how it works, examples of its applications, and future directions.

Overview of RFID Technology

RFID (Radio-Frequency Identification) technology identifies and transmits information using radio waves of a specific frequency. Simply put, it’s a method of encoding user information into radio waves and exchanging that information via those waves. Transportation cards, Hi-Pass systems, and certain smartphone features—all of which we encounter frequently in our daily lives—utilize this RFID technology.

History and Origins

The concept of RFID traces its origins to IFF (Identification, Friend or Foe) technology developed in 1939 during World War II. It was initially developed to be attached to aircraft to distinguish between friendly and enemy forces. Subsequently, researchers advanced the concept of identification using radio waves, light, and sound waves; among these, the method using radio waves established itself as the most efficient communication technology and was put into practical use in 1973. Since then, the market has grown significantly thanks to its convenience and low cost, and it continues to be used in a wide range of fields today.

Technical Basis and Classification

Over the past few decades, advancements in semiconductor devices have greatly improved data transmission capacity, speed, and accuracy; however, the basic principle of RFID is based on the relatively simple concept of electromagnetic induction. Today, RFID is broadly classified into two types—mutual induction and electromagnetic wave—depending on whether the tag contains an internal power source.

Operating Principle of the Mutual Induction Method

In the mutual induction method, the coil on the antenna side allows a current carrying information to flow, modulated by amplitude, thereby forming an induced magnetic field around the antenna. A tag approaching this field receives an induced current through its internal coil and transmits the information to the IC (integrated circuit) memory. The logic circuit inside the IC stores information such as the payment amount, time, and location based on yes/no signals, generates a response, and transmits it back as an electrical current. Transportation cards are a prime example of the mutual induction method.

Characteristics of the Electromagnetic Wave Method

The most significant difference with the electromagnetic wave method is that the tag contains its own power source. Since the tag can generate and transmit signals using its own power, it has a long communication range and can operate independently. It is well-suited for applications that require rapid signal exchange over long distances, such as the Hi-Pass system.

NFC and Bidirectional Communication

NFC (Near Field Communication) is a technology that has recently garnered attention as it is now built into all smartphones. Jointly developed by Sony and NXP in 2002, this technology is a type of RFID that is embedded in smartphones to provide various value-added services. Whereas traditional RFID typically involved one-way transmission from the tag to the reader, NFC enables two-way communication because the tag also acts as an antenna. Furthermore, its transmission speed is faster than that of standard Bluetooth or some internet connections, and it offers better responsiveness, making it highly likely to see widespread use in the future.

Advantages and Security Challenges

The major advantages of RFID are its simplicity of implementation and use, low-cost hardware, and low power consumption. As a result, investment and application are thriving across various industries. On the other hand, RFID is vulnerable to security breaches because it transmits information openly via magnetic fields. There is a risk that malicious actors could intercept the radio waves and steal personal information. Therefore, the goal for the future is to enhance security while making information transmission faster and more accurate.

Smart Readers and Future Directions

Companies are striving to evolve tags from simple identification devices into “smart readers.” Similar to NFC, the goal is to enable two-way communication and add information and communication functions—such as encryption and data filtering—beyond the IC chip itself. This will create efficient and highly secure devices by encrypting and filtering transmitted information. Efforts to resolve RFID’s security issues through such technological advancements are ongoing.

Impact on Daily Life and Outlook

The emergence of RFID technology has greatly simplified daily life. Thanks to transit cards that allow payments to be made simply by holding them up to a terminal, the process of using public transportation has become more convenient, and calculating transfer fares has also become easier. The reduction in highway traffic congestion due to Hi-Pass is another example of RFID application. In the future, as smartphones are equipped with smart reader functionality, the exchange of information between electronic devices will become much faster and simpler. Enhanced security will also make financial services—such as banking—more convenient, leading to expectations of market growth.