How To Select an RFID Antenna An RFID antenna is a necessary part of any RFID system. Unless the antenna is embedded into a reader, you will have to select and purchase the right antenna for your application. And there are a lot of options to select from. Frequency– this will depend on your tags – choose between LF, HF, UHF or Microwave frequency. Frequency Region– this will depend on country of operation and will affect only the UHF frequency. As you know, due to regulations, the frequency bands for UHF RFID slightly differ for US, Europe and other regions. Most UHF antennas are specified as globaland they are tuned for operation between 860 to 960 MHz. You can also find antennas that are specifically tuned for each region, which slightly improves their performance in the particular region. For instance, 865 - 868 MHz antenna will perform better when deployed in Europe than a global antenna, although this may not be distinguishable in most applications. Global antenna will work well for most applications; however, you can choose region-specific antenna for difficult deployments (long read ranges, RF challenging environment) or where global is not available. Read range and size– smaller antennas within the same frequency will have shorter read range and vice versa. The antennas with the shortest read range for UHF technology will be Near Field Antenna, that utilize near field as opposed to far field as regular UHF antennas. These are often used for item tracking and where short ranges are required for item singulation and/or security purposes. Profile width– if you are short on space or for esthetic reasons, you may need to look for low profile antennas that have a side connector or a side pigtail. Gain– gain affects read range and beamwidth. Antennas with higher gain will have longer read range but narrower beam. Antennas with lower gain will have shorter read range and wider beam width. Select antenna gain based on the shape of your interrogation zone and coverage needs. Most common gain is 6dBi but you can find antenna with 1 dBi (low gain) and also with 11 dBi (high gain). Polarization– you can select between circular and linear polarization. Circularly polarized antennas will have shorter read range but will be less orientation sensitive. You can select between right hand circularly polarized antennas (RHCP) or left hand circularly polarized antenna (LHCP). Sometimes you can see dual circularly polarized antennas that have both left hand and right hand polarization. Linearly polarized antennas will provide longer read range and more focused beam but will read only tags that have antennas parallel to the plane of wave. If your tag orientation is not fixed, especially when using single dipole tag antennas (which are most common), you should select a circularly polarized antenna. VSWR– voltage standing wave ratio or also called return loss - Due to mismatches in impedance within the connector, some of the signal is reflected. The ratio of the i...

Dual-frequency RFID is a relatively special application market. It is still relatively narrow and the industry chain is relatively simple. At present, the dual-frequency RFID chips on the market mainly use UHF+HF to make the same IC. There are still some scenarios in the market that use UHF. Tag + HF tag two different tags combined scheme. In addition to the chip threshold, dual-frequency tag equipment and manufacturing are also more difficult than ordinary tags, because the working principles of HF and UHF two different frequency bands are completely different, one is near-field coupling and the other is far-field radiation, which requires two different antenna combinations. In addition, the current usage of dual-frequency products is not large, so dual-frequency RFID products are more expensive than ordinary ones, whether they are chips or tags. According to the information we have investigated, the application volume and application scenarios of dual-frequency RFID tags are rapidly increasing, and may become a new market growth point. 1. Introduction to the advantages of dual-frequency RFID The advantages of dual-frequency RFID products are mainly in the following two aspects: >>Advantage 1: The function of UHF RFID for rapid inventory in large quantities is retained The biggest advantage of UHF RFID is that it has a long transmission distance and can be read in groups. It is very suitable for some scenarios that require quick inventory, especially in the B-side warehousing logistics and sorting links. >>Advantage 2: retains the ability of HF RFID to interact with mobile phones Because the NFC on the mobile phone is a kind of HF RFID technology, the HF RFID tag can interact directly with the mobile phone, which greatly expands the use boundary of RFID. Anti-counterfeiting traceability requirements. Therefore, dual-frequency RFID tag products can not only meet the needs of the B-side for efficient turnover, anti-lost, and visual management, but also meet the needs of the C-side crowd for anti-counterfeiting and traceability, which can form a good closed loop in business. 2. Dual frequency RFID market and application introduction The application scenarios of dual-frequency RFID products mainly have the following characteristics: The usage scenarios need to combine the high inventory efficiency of ultra-high frequency and the characteristics of high frequency interaction with mobile phones, which requires a relatively large amount of applications and concentrated, and then there is a demand for large-scale inventory; in addition, the consumption attributes of products are strong , need to interact directly with consumers. The unit price of the product in the application scenario is more expensive, because the product is more expensive, it will stimulate the consumer's need for anti-counterfeiting traceability. Only high-value scenarios can afford such a cost input. There is a strong demand for authenticity identification, but there is...

RFID Greatly Improves Logistics Sorting Efficiency And Accuracy Project background introduction With the increasing scale of online shopping, the development of the logistics industry is becoming more and more prosperous, and logistics companies have higher and higher requirements for the average daily throughput and operating efficiency of super-large warehouses. This is a huge test for the operation and management of warehouses, especially It is a high-frequency inbound and outbound operation of large-scale goods. It is urgent to greatly improve the efficiency and at the same time ensure the accuracy of the data and information. With the increasingly fierce competition among logistics companies, whether they can be better than their competitors in warehouse operation efficiency plays a crucial role in seizing market opportunities. The pure manual mode of traditional logistics warehouses has already become more efficient in terms of efficiency. To increase to the upper limit, only by transforming the traditional logistics warehouse model with the help of emerging technologies such as the Internet of Things and big data, can the operational efficiency be further greatly improved and the old upper limit be broken. In order to realize the automation and digitization of the operation of large-scale logistics warehouses, more and more logistics enterprises have put forward to us the need for intelligent digital transformation of the inbound and outbound links of logistics warehouses. Project design goals 1. With the help of RFID technology, realize the intelligent and digitalization of warehouse entry and exit; 2. Improve overall operational efficiency and reduce labor costs; 3. Realize the automatic collection, storage and management of data, and visualize it to provide data support for operational decision-making; 4. Connect with the customer's original WMS, ERP and other business systems, and provide a complete and replicable overall solution. Project requirements 1. In response to the customer's urgent need to improve the efficiency of warehousing and warehousing, realize the warehousing and warehousing capacity of large volumes and high speed; 2. Automatically count and check documents to avoid manual errors and improve the accuracy of inbound and outbound data information; 3. Real-time presentation of inbound and outbound data, and upload and storage to realize the visualization of operations in the library; 4. Automatically record all operational behaviors, and connect to the customer's WMS and ERP systems to achieve traceable query of process records. Project specific plan Large-scale logistics warehouses of logistics companies have huge scale and high frequency of daily inbound and outbound warehouses. It is necessary to ensure the accuracy of inbound and outbound data while improving the speed of inbound and outbound inventory and the volume of a single inventory. According to the needs of customers, we provide customers with high-performan...

Through the establishment of a community card system, the system distributes a composite personnel electronic label to each elderly person and staff member, which has comprehensive functions such as identity authentication, credit card consumption, access control management, and emergency rescue positioning. The personnel positioning system incorporates the indoor and outdoor areas of the entire community into the monitoring range of the wireless rescue network. When the elderly encounter difficulties anywhere in the community, when the emergency rescue button on the carry-on card is pressed, the computer screen of the on-duty personnel in the monitoring center will immediately display the emergency rescue button. The location of the elderly, as well as relevant information such as their personal health status and previous diseases, provide guidance for medical staff to respond quickly and seek emergency help. At the same time, it can also monitor and monitor the real-time location of the staff for standardized management and reasonable scheduling. The system consists of key equipment such as "reader", "dual-frequency personnel electronic tag", "server", "positioning database" and "application software". The basic positioning process is as follows:   a) Arrange a certain number of readers in the installation distribution map in the community, and the number of readers is determined by the required coverage and positioning accuracy;   b) Connect each reader to the background location server through Ethernet to form a wireless location network; c) Place reference electronic tags for positioning in the community ;   d) Allocate dual-frequency personnel electronic tags to the elderly and staff, and establish a one-to-one correspondence between "tags" and "persons";   e) Install and run the positioning software on the server, and the positioning data can be directly written into the database or integrated into other systems. System functions   Real time monitoring   Display icons on the map corresponding to the person or thing the tag is bound to;   Real-time monitoring of tags and display of the current location of tags in the map;   The label flashes to indicate an alarm;   Tabs are grouped, displayed with different icons;   During the positioning process, the icon can be seen moving smoothly in real time;   The specified label can be tracked, and the map automatically switches with the movement of the label;   Move the mouse over the icon to see the information and status of the icon;   Detailed information can be displayed after clicking on the icon;   You can manually switch the map to view the activity of all labels on the specified map;   The map can be zoomed in and out, adjusted to a suitable size;   The map automatically switches floors when tracking a single ...

что такое протокол связи радиоинтерфейса RFID? протокол связи радиоинтерфейса — это спецификация обмена информацией между считывателем и меткой,, и цель состоит в том, чтобы решить проблему взаимосвязи между оборудованием разных производителей.. ISO/IEC сформулировал протоколы радиоинтерфейса для 5 частот полосы. эта идея полностью отражает относительность унификации стандартов. ISO/IEC 18000-1 информационные технологии: (радиочастотная идентификация на основе управления предметами) справочная структура и стандартизированное определение параметров . регулирует таблицу параметров связи считывателя и тега, основные правила прав интеллектуальной собственности, и т. д..,, которые обычно соблюдаются при обмене данными по радиоинтерфейсу протокол. Таким образом, стандарты, соответствующие каждой полосе частот, не должны повторно указывать один и тот же контент. ISO/IEC 18000-2 информационные технологии: (радиочастотная идентификация на основе управления предметами) применимо к низкой частоте 125~134 кГц, определяет физический интерфейс для связи между меткой и считывателем, считыватель должен иметь тип A (FDX) и возможность связи с метками типа B (HDX); определяет протоколы и команды, а также методы предотвращения конфликтов для многотеговой связи. ISO/IEC 18000-3 информационные технологии: (радиочастотная идентификация на основе управления предметами) применимый к высокая частота 13.56 МГц, и определяет протокол физического интерфейса, и команду между считывателем и меткой, а также методы предотвращения столкновений.. Протокол предотвращения столкновений можно разделить на два режима,, среди которых , режим 1 делится на базовый тип и два расширенных протокола (протокол с множественным ответом без временного интервала и протокол чтения нескольких транспондеров без завершения и окончания временного интервала с адаптивным опросом): режим 2 принимает протокол частотно-временного мультиплексирования FTDMA. , и всего 8 каналов подходят для ситуации с большим количеством тегов. ISO/IEC 18000-4 информационные технологии: (радиочастотная идентификация на основе управления предметами) подходит для микроволнового диапазона (хотя 2.4 ГГц находится в диапазоне частот УВЧ,, он обычно называется микроволновым диапазоном, по той же причине, 5.8 ГГц RFID должен быть в диапазоне СВЧ,, который также учитывается в микроволновом диапазоне) 2.45ghz,, который определяет протокол физического интерфейса, и команду между считывателем и меткой,, а также методы предотвращения столкновений., стандарт включает два режима: режим 1 — рабочий режим пассивных тегов,, и читатель будет говорить первым; режим 2 - это активные теги,, а рабочий режим заключается в том, что тег будет говорить первым. ISO/IEC 18000-6 информационные технологии: (радиочастотная идентификация на основе управления предметами) применим к полосе сверхвысоких частот 840~960 МГц, и определяет протокол и команду физического интерфейса, между считывателем и меткой, а также методы предотвращения столкновений. содержит ...

каковы основные компоненты системы RFID? самая основная система RFID состоит из трех частей: тег (тег): состоит из соединительных элементов и чипов, каждая метка имеет уникальный электронный код,, который прикрепляется к объекту для идентификации целевого объекта; читатель (читатель): устройство, которое считывает (а иногда и записывает) информацию о метках,, которое может быть ручным или стационарным; антенна: передает радиочастотные сигналы между меткой и считывателем.