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1 Introduction With the rapid development of radio frequency identification (RFID) technology, radio frequency identification systems have become more and more widely used. Due to the high read rate and long read distance of the decimeter wave band (UHF) RFID system, more and more studies on UHF band RFID systems have been made in recent years. Passive RFID tags usually consist of an RFID tag chip and an RFID tag antenna. The design of the RFID tag antenna plays an important role in the RFID...
Abstract: The research on anti-jamming technology of satellite navigation and positioning system is of great significance. Anti-jamming technology based on antenna arrays needs to collect multiple GPS antenna signals at the same time, and most of the GPS receivers can only receive single antenna signals, which is difficult to meet the demand. For this reason, a GPS anti-jamming radio frequency front end of a four-element antenna array was designed. The four-way antenna array receives four GPS...
Summary: A multi-input and multiple-output (MIMO) mobile antenna suitable for mobile terminals is proposed. The MIMO antenna is composed of two centrally symmetrical antenna elements and adopts a coupling feeding method to expand the antenna bandwidth and ensure the miniaturization of the antenna. Through the middle of the floor, a T-shaped branch is introduced, and the antenna units are connected with a neutral line to achieve the purpose of improving the isolation between the antenna units....
A friend asked the router to select a few antennas. Before choosing a router to buy several antennas, we must first understand the difference between the one, two, and three antennas of the wireless router. For older wireless routers up to 11g, an antenna supports up to 54Mbps. For an old-fashioned wireless router up to 11n protocol, an antenna supports up to 150Mbps; For new wireless routers up to 11ac, an antenna supports up to 433 Mbps; If you hear how fast a router can claim to be, you can...
Dual-band is the working frequency band in ISM2.4G and ISM5G, and the basic application is not dual-frequency at the same time; for ISM5G frequency band, there is a difference between IEEE 802.11a and IEEE 802.11ac standards, and the single-channel band of 11ac standard can reach up to 433Mbps, and 11a. The single channel is still at 150 Mbps. It can be said that the 11a standard has only better anti-interference ability with respect to the ISM 2.4G band, and 11ac is able to resist interference...
In this article, I will introduce various aspects of millimeter-wave (mmW) beamforming and antenna technology and the technical design examples that I think are interesting and unique. Beamforming The beam forming network (BFN) is used to combine signals from small antennas into a more directional pattern than each individual antenna alone because of array factors . Beamformers are used for radar and communications. An example of a radar is a linear array that provides four azimuth beams for an...
Into the late autumn, many small partners may travel together to go to some pleasant places but sparsely populated places to feel the quiet atmosphere away from the city. However, when traveling, it is inevitable that there will be decentralized operations, and sometimes there will be cases where the signal is not reachable by the mobile phone. The former solution was a walkie-talkie, but today, Xiao Bian discovered an extension device that can send text messages, even if your cell phone...
Shuaiwei Guangzhou high-altitude vehicle rental, Guangzhou lift truck rental, Guangzhou street light car rental, Guangzhou ascending car rental, Guangzhou Yuntai car rental, Guangzhou lift car rental, holiday rental services are provided, vehicles used in high-altitude areas, industrial plants Indoor and outdoor high-rise construction, the bottom of the pedestrian bridge installation guide card, the real estate company and the advertising department to hang billboards, the bottom of the viaduct...
Japan’s Institute of Advanced Manufacturing Technology has successfully developed a technology for producing wireless tag antennas by printing. Silver paste is used as a metal material, and it is subjected to pressure treatment and heat treatment by "pressure annealing." The Japan Institute of Advanced Research and Technology (hereinafter referred to as "Production Research Institute") has successfully developed a technology for producing wireless tag antennas by printing....
Japan's Morimura Corporation and Morimura Chemical have recently developed a new technology that utilizes a combination of printing technology and gold plating to produce wireless tag (RFID tag) antenna patterns. The technology was demonstrated at the recently held Auto ID Exhibition. No etching is used, which means that the material can be cut off and the wireless tag antenna can be produced at a lower cost. Morimura Commercial plans to use this technology to mass-produce wireless tag...
The communication distance of the wireless module is an important indicator. How to maximize the effective communication distance has always been a question of doubt. This article gives some explanations based on the debugging experience and the selection and use of the antenna. It is hoped that it will help the engineer to quickly debug the communication distance. First, the type of antenna With the advancement of technology, in order to save the development cycle, many manufacturers have...
After playing outdoors for many years and led by outdoor team for many years, I know the importance of safety. I remember when a famous leader came to the outdoors and said something to me: I often play with my hands, GPS and GPS devices. Therefore, GPS is an indispensable equipment, but because of economic strength has been using relatively low-end equipment. The unguided crossing in the uninhabited area of Xinjiang, which was just completed in September, made me very depressed. Low-end GPS...
Today, more and more people choose to buy used cars. According to industry insiders' forecasts, by 2020, the domestic auto market will reverse its status, and the transaction activity of used cars will greatly exceed that of new cars. When people buy used cars, the second-hand car dealers in the black-hearted car dealerships use a re-decorated fire car to infringe on the rights of consumers. People need to learn to identify fire cars quickly and easily and avoid being cheated in the process...
The WiFi smart speaker is connected to the music terminal through WiFi, and performs full music control directly through the APP software. Different music can be played in different rooms through software, and the same music can be played in different rooms at the same time. Not only that, you can connect more music terminals together. So how to buy WiFi smart speakers on the market? What brand of wifi smart speaker is better? Wifi smart speaker selection skills 1. Sound quality: Sound quality...
RFID antenna printing is a very precise printing process. Due to the trajectory printed and the spacing between tracks, the precise shape size directly determines whether the antenna can work properly as required. Rotary screen printing is a very effective printing method for RFID antennas, and is the only printing method that can print thick ink onto the surface of a material, and the thickness of the ink can be from several micrometers to 300 micrometers. In fact, this kind of printing method...
Wifi smart socket allows you to use a mobile phone to remotely control the home appliances, so that you can not worry about worrying about home appliances forget. In addition to remote control of electrical appliances, wifi smart socket what role? What is the working principle of it? Xiaobian this for everyone to answer. The role of WIFI smart socket 1, smart socket and traditional socket function, can act as a charger for household appliances, mobile digital devices, it has a standard home...
After the emergence of WiFi smart speakers, many people have abandoned the Bluetooth speaker. The wifi speaker transmits at a faster distance and achieves true lossless playback. For friends who like to listen to music, it is simply a gospel. The following Xiao Bian will introduce the main functions of the WiFi smart speaker for everyone. WiFi smart speaker main function WiFi patent connection technology The speaker is connected to the music terminal through WiFi, and full music control is...
1 Introduction With the rapid development of communication systems, there is an urgent need for a new type of antenna with low cost, high gain, and automatic beam tracking capability. The retrodrillecture (RetrodirecTIve Antenna) based on the phase conjugate technique can automatically transmit the incoming signal of the incoming wave (incident signal or processed incident signal) to the incoming wave direction without the prior knowledge and complexity of the incoming wave direction. Digital...
Since the modern era, mobile communication technology has developed rapidly and is becoming more and more popular. Wi-fi technology is an important part of modern wireless communication technology. Due to its low profile, good directionality, high fabrication feasibility, low cost, conformability to the surface of the object, and easy array formation, the microstrip antenna has been widely favored; therefore, Wi-fi technology and microstrip antennas Technology is a hot topic in recent years....
As market competition intensifies, hardware devices are developing in an integrated direction. Antennas have also evolved from external evolution to embedded, and we will first introduce the types of antennas for this type of application: (1) On Board onboard: integrated with PCB etching, limited performance, very low cost, used in Bluetooth, WIFI module integration; (2) SMT mount type: the material is ceramic, metal sheet, PCB, and the performance cost is moderate, suitable for high-volume...
What is an RF connector? An RF connector is defined as a detachable component that is typically attached to a cable or device for electrical connection of the transmission line system. As can be seen from this definition, it has the common feature of a "separable component" connector. “Transmission line system” refers to the microwave transmission system. The common transmission line structure is as follows: Taking the commonly used coaxial line as an example, the main mode of the...
An antenna system is a system consisting of a transmitting antenna and a receiving antenna. The former is a transmission mode converter that converts the radio frequency current or electromagnetic wave of the guided wave mode into a spatial electromagnetic wave of the diffusion wave mode; the latter is a transmission mode converter of its inverse transformation. As a derivative transmitting antenna for conducting wave-diffusion wave mode conversion, as the receiving wave I for the diffusion...
WIFI test head can be customized for other specifications Test - lowercase jpg Kaixin micro test This production is based on drawings collected online. It is said that there is a gain of about 11DB, which is true after the completion of the test. material: tool: Reference drawings: Shaping: Simple handling of mosquito coils Mounting the antenna: clever use of heat-shrinkable tubes for insulation Jiaxi fixed:
Observe the proper disassembly method, first remove the external accessories, covers, tubes, etc. Disassemble in the order of the table and the inside; disassemble the entire machine into several parts, and then unload the components and parts; use a reasonable disassembly tool. The tools used for disassembly must be compatible with the parts being disassembled. For example, when disassembling the threaded connecting piece, it is necessary to use a suitable wrench, avoiding damage to the parts...
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.