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introduction This article refers to the address: http:// Conformal array antennas are one of the most important development directions in current antenna technology. Microstrip antennas have been widely used in missiles, aircraft, satellites, rockets and other aircraft in recent years due to their low profile, small size, light weight and easy to conform to the carrier. However, microstrip array antennas are less efficient due to ohmic losses, dielectric losses, and spurious emissions in the...
The FM radio module has become a standard for many mobile phones and earphone devices. They basically use the earphone cable as the FM antenna. Because the receiving margin of the earphone cable as an antenna is not large, it is not convenient and the Bluetooth earphone cannot be used when the earphone cable is used, so the earphone cable as a radio antenna is not an ideal solution. Another solution is to integrate a passive antenna into the inside of the mobile phone. However, since the...
1 Introduction This article refers to the address: http:// With the development and upgrading of electronic information countermeasure systems, radar systems, weapon control systems, command and decision systems, and communication and navigation systems, the operating frequencies are highly dense or even overlapping, and the electromagnetic power density per unit volume is within a limited spectrum. Rapid increase in electromagnetic interference and sensitivity of various electronic devices....
The use of radio transceivers will inevitably suffer from electromagnetic radiation. Although the degree of influence of electromagnetic radiation on human health is still unclear, it is undeniable that when electromagnetic radiation exceeds a certain intensity, it will cause harm to the human body, resulting in physical fatigue, headache and insomnia. , memory loss, abnormal blood pressure, decreased immune function. This article refers to the address: http:// The basic function of the antenna...
introduction This article refers to the address: http:// Due to the system integration characteristics of the CAN bus, the application range of the CAN bus technology based on the vehicle body control system has far exceeded the field of automobile control, and has expanded to various other measurement and control fields such as the machinery industry, household appliances and sensors, and is recognized as an important international. Industrial fieldbus. As a motion control object, stepper...
Label: GSM dual-band antenna impedance This article refers to the address: http:// Usually the impedance matching at a certain frequency point can be performed by using the SMITH chart tool. The two devices can definitely get the impedance matching from one point to another through the series + shunt inductor or capacitor, but this It is single frequency. The mobile phone antenna is dual-frequency, and matching one of the frequency points will inevitably affect another frequency point, so the...
introduction At present, urban security systems are getting more and more people's attention, and customers' requirements for the function and performance of security systems are getting higher and higher. This paper proposes a wireless security system based on GSM and Zigbee technology. The system is characterized by the advantages of GSM and Zigbee wireless network, realizes the wireless network of security system, saves the cumbersome wiring process, and realizes security...
December 30, 2015, Beijing – Keysight Technologies Inc. (NYSE: KEYS) today announced the addition of new GSM, GPRS, EGPRS and TD-SCDMA, HSPA test functions to its E7515A UXM wireless tester. With these enhancements, user device developers can use a single UXM tester to validate their multi-format LTE terminals. The new GSM and TD-SCDMA test application software allows users to quickly switch between W-CDMA, GSM and TD-SCDMA systems using a single UXM, which can be implemented in a transceiver...
As a major infrastructure and public utility industry involving the national economy and the people's livelihood, the state has always attached great importance to the investment and development of railways. Since 2006, China Railway has ushered in a period of rapid development. From Shitai Line to Guangzhou-Shenzhen Port to Beijing-Shanghai High-speed Railway, to this day, the grand blueprint for high-speed railway construction is still going on. As a key project of railway construction...
The era of 5G is coming soon, and now online is rumored that 2G networks will also face retreat. 2G is already an old antique, but one of the technologies is very attractive to people, that is the GSM network, what is its role? 2G exits the network, the GSM network will also be abandoned, what effect will GSM retreat? Today's smartphones are able to achieve smooth Internet access, video viewing, remote voice and other functions, in addition to the continuous innovation of mobile phone...
I. Project Overview 1.1 Introduction Today's greenhouse greenhouse industry is expanding, people's health requirements are getting higher and higher, and greenhouse greenhouses must have a suitable growth environment to improve the quality of agricultural products. This paper introduces the GSM-based solar agricultural greenhouse multi-functional intelligent monitoring system, which supplies power to the single-chip microcomputer through solar energy, sets the most suitable growth...
With the improvement of people's living standards, cars have gradually entered the family, and the requirements for car theft are getting higher and higher. Although the car alarms on the market are gradually improving, these anti-theft devices mainly use call alarms, high-voltage electric shocks, etc. With the development of science and technology, car theft technology is also getting higher and higher, making people's defenses impossible. Car burglar has extremely important research...
51 MCU and GSM module to achieve communication 1, check the quality of the serial line 1) Plug the serial cable into the computer and short the 2 and 3 pins of the serial port with a short circuit. 2) Open the serial port debugging assistant 3) Click Auto Send, send a random data in the window of automatic sending to see if you can receive the data sent by yourself if the serial port is normal, otherwise it is bad. 2, after the completion of the microcontroller program, see if the serial port...
51 MCU and GSM module to achieve communication 1, check the quality of the serial line 1) Plug the serial cable into the computer and short the 2 and 3 pins of the serial port with a short circuit. 2) Open the serial port debugging assistant 3) Click Auto Send, send a random data in the window of automatic sending to see if you can receive the data sent by yourself if the serial port is normal, otherwise it is bad. 2, after the completion of the microcontroller program, see if the serial port...
introduction: The SoPC-based automotive safety monitoring system uses Altera's latest SoPC (Programmable System-on-Chip) solution, the Nios processor soft core, to monitor the parking and operating status of the car with GPS and GSM systems. The SoPC-based vehicle safety monitoring system can be widely used in the anti-theft, routine maintenance and traffic accident handling of automobiles, providing an effective test method for vehicle faults. 1 system hardware components The design uses...
introduction: SMS (Short Message Service) short message service is an application service for sending and receiving text information between a GSM terminal (mobile phone) provided by the GSM (Global System for Mobile CommunicaTIon) system through a service center. Complete the storage and forwarding of information. As a basic service of GSM network, short message service has been paid more and more attention by system operators and system developers. Various applications based on this service...
If you travel a lot, are you used to the unreasonable mobile roaming charges? However, mobile phones are sometimes absolutely necessary – we have to pay for mobile roaming when we work or go overseas, because we need to stay in touch with the office and talk to people around the world about the Raspberry Pi. Holger Leusch, Benjamin Reichel and Karina Hochstein all face this problem. To make matters worse, Holger often goes to Cambodia, but his German mobile phone supplier doesn't even have...
1 Introduction With the development and popularization of social information technology, the automation level of industrial process control is getting higher and higher, and various data collection on industrial sites is becoming more and more common. However, when some existing industrial sites are transformed, they are found. There are some difficulties in collecting industrial field data. For example, the data acquisition control center is too far away from the industrial site, or is not in...
0 Preface The residual current action protector is an important protection device in the low-voltage power grid. The real-time status monitoring of the residual current action protector in the intelligent transformation of the agricultural network can greatly improve work efficiency and save labor cost. Aiming at the large and scattered distribution area of agricultural network equipment, this paper proposes a design scheme of remote monitoring system for residual current action protector...
introduction At present, urban security systems are getting more and more people's attention, and customers' requirements for the function and performance of security systems are getting higher and higher. This paper proposes a wireless security system based on GSM and Zigbee technology. The system is characterized by the advantages of GSM and Zigbee wireless network, realizes the wireless network of security system, saves the cumbersome wiring process, and realizes security...
1 Electromagnetic compatibility (EMC) Definition EMC performance is expressed as the size of a device or unit and other devices or units within a certain range of time, frequency, electromagnetic space within the scope of "peaceful coexistence", in other words: The adverse effects of equipment or units on other equipment or units, the interference is small, and in this electromagnetic environment, the equipment or unit can work stably and reliably, and has certain anti-interference...
1: What is GPRS GSM? At present, the second generation mobile communication technology (GSM) is gradually developing to the third generation mobile communication technology 3G), and GPRS (General Packet Radio Service) as a transition technology from GSM to 3G becomes a bridge connecting GSM and 3G. GSM is the abbreviation of Global System for Mobile Communications, which means global mobile communication system and is one of the world's major cellular systems. GSM is based on the narrowband...
The proportion of small and medium-sized cities in China has reached 60% to 70%. The scale of GSM network users also has an absolute advantage. The problems of network quality, resource utilization and operation efficiency in GSM networks in small and medium-sized cities are similar. The optimization ideas and implementation methods are universal. This paper summarizes the characteristics of GSM networks in small and medium-sized cities, and gives the network planning and remediation process...
Under the circumstances that people's awareness of environmental protection is increasing and the construction regulations of base stations are still not perfect, the most effective way to alleviate the site selection pressure of TD-SCDMA base stations is to improve the sharing rate of TD-SCDMA and GSM network base stations. In the construction of the TD-SCDMA Phase I trial network, China Mobile has a considerable number of 2G base stations in 8 cities, but in the initial stage of the...
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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.