5G 4G 3G M2M and IoT antenna News
  • The transmission distance of 5G is only 340 meters. Can 5G be used in the field?
    The transmission distance of 5G is only 340 meters. Can 5G be used in the field? September 17,2019.
    How many base stations are built? It depends on the wavelength of electromagnetic wave. The longer the wavelength, the less the base station and the less the investment. However, the longer the wavelength, the less information and data it carries, and the lower the transmission efficiency. Therefore, mobile communication is developing in the direction of shorter wavelength. So, what is the wavelength of5G? This is determined by the formula: the speed of light = wavelength * frequency. The speed of light is constant. It is300,000 kmper second. The frequency of5Gis 24 gHz-32 gHz. According to the calculation of 28gHz, the wavelength is about108 mm. Therefore, 5G communication belongs to millimeter wave communication. Its advantages are large transmission bandwidth, high transmission efficiency, but its disadvantages are short transmission distance and easy to be blocked. The cost is high. Compared with4G, the transmission efficiency is improved by hundreds of times, but the expansion of base station alone is increased by more than 20 times. At present, the construction density of 4G base stations in cities has basically achieved 500 meters, while in some urban central areas, it has reached 200-300 meters, and even in some areas, the density of base stations can even reach 100 meters. The two main reasons are as follows: first, there are too many high-rise buildings in the city, and the obstruction is serious, so we have to build more base stations; second, the population density in the city is much larger than that in the rural suburbs, considering the user perception, we also have to build more base stations. In fact, the biggest problem of 5G coverage is still on the upstream, as well as indoor coverage. Because of the high frequency of5G, the indoor coverage effect will be worse than the current4Gcoverage, which is why the user experience speed ofKoreaand theUnited Statesis not so fast after5Gcoverage. In fact, the reason why5Gwants to build more base stations in cities is not to say that the city's macro base stations. Now the density of4Gmacro base stations in cities is large enough. Maybe more is to build some indoor 5G base stations. In rural areas, there are fewer high-rise buildings and fewer barriers, so there is no need to build a base station with the same density as a city.
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  • What is differentiate FPC and PCB antenna?
    What is differentiate FPC and PCB antenna? August 5,2019.
    Understanding the characteristics of PCB antenna and FPC antenna Internet of Things and intelligent hardware products need antenna to transmit data on the Internet. The smaller the space and the more frequency bands, the more complex the antenna design is. External antennas are generally standard products, suitable frequency band, without debugging, plug and play. For example, express cabinets and vending machines, magnetic antennas are commonly used, which can be sucked onto the iron shell. These antennas can't be placed inside the tin cabinet. Metal can shield the antenna signal, so they can only be placed outside. The advantage is easy to use and cheap, but the disadvantage is that it can not be used in small-sized products. The antenna length is about 1/4 of the wavelength of electromagnetic wave, so the lower the signal frequency, the longer the antenna length.Therefore, a long pole antenna is needed for a FM radio of about 100 MHz, a walkie-talkie of about 400 MHz, and an external long pole antenna is also needed. The 433MHz wireless serial port commonly used in the Internet of Things is usually also equipped with an external antenna. SL-Base Station Antenna Plate Antennas that are made shorter, such as 1/8 or 1/16 wavelengths, can also be used, but the efficiency will decrease. Some devices will adopt "short antenna + LNA" mode, and can also achieve the reception effect of long antenna. However, short antennas need to increase the transmitting power to achieve the effect of long antennas. Therefore, the radio needs to transmit signals, which are long external antennas, while FM radio only receives no transmission, and has built-in receiving antennas. For example,2G(900MHz),4G(700-2600MHz), WIFI and Bluetooth (2.4GHz), GPS (1.5GHz), these commonly used Internet of Things communication methods can be used as built-in antennas. For small size products such as handsets, wearable design and smart home, external antennas are seldom used, and built-in antennas are commonly used.The product has high integration, beautiful appearance and slightly weaker performance than the external antenna. The built-in antennas include ceramic antenna, PCB antenna, FPC/steel antenna and LDS antenna. Ceramic antenna Ceramic antenna, the most used in Internet of Things products, is the GPS antenna and Bluetooth antenna. The advantages are: small space occupation and good performance. The disadvantage is that it is difficult to achieve multi-band, so it is difficult to be applied in4Gproducts. The requirement of circuit board clearance is relatively high, and it is not suitable for the products with special compactness. GPS, Bluetooth and GSM Ceramic Antenna Slider Board of Deep Connection Circuit Communication Base Station PCB antenna As mentioned above, an antenna is a wire of a certain length. This line can also be drawn on the PCB board, which is the PCB antenna. PCB antenna is widely used in Bluetooth ...
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  • MIMO antenna system
    MIMO antenna system June 17,2019.
    Multiple-Input Multiple-Output (MIMO) refers to the use of multiple transmit and receive antennas at the transmit and receive ends to transmit and receive signals through multiple antennas at the transmit and receive ends. Communication quality. It can make full use of space resources, realize multiple transmission and multiple reception through multiple antennas, and can increase the system channel capacity by multiple times without increasing spectrum resources and antenna transmission power, showing obvious advantages and being regarded as next generation mobile. The core technology of communication. The MIMO (Multiple-Input Multiple-Output) system is a core technology applied to 802.11n. 802.11n is a new wireless LAN technology after IEEE 802.11b\a\g, with a speed of up to 600Mbps. At the same time, proprietary MIMO technology can improve the performance of existing802.11a/b/g networks. The technique was first proposed by Marconi in 1908, which uses multiple antennas to suppress channel fading. Depending on the number of antennas at both ends of the transceiver, MIMO can also include a SIMO (Single-Input Multi-ple-Output) system and a MISO (Multiple-Input Single-Output) system compared to a conventional SISO (Single-Input Single-Output) system.
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  • Wireless sensor network
    Wireless sensor network June 5,2019.
    Wireless sensor network (WSN) refers to a group of spatially dispersed and dedicated sensors for monitoring and recording the physical conditions of the environment and organizing the collected data at a central location. WSNs measure environmental conditions like temperature, sound, pollution levels, humidity, wind, and so on. These are similar to wireless ad hoc networks in the sense that they rely on wireless connectivity and spontaneous formation of networks so that sensor data can be transported wirelessly. WSNs are spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, pressure, etc. and to cooperatively pass their data through the network to a main location. The more modern networks are bi-directional, also enabling control of sensor activity. The development of wireless sensor networks was motivated by military applications such as battlefield surveillance; today such networks are used in many industrial and consumer applications, such as industrial process monitoring and control, machine health monitoring, and so on. The WSN is built of "nodes" – from a few to several hundreds or even thousands, where each node is connected to one (or sometimes several) sensors. Each such sensor network node has typically several parts: a radio transceiver with an internal antenna or connection to an external antenna, a microcontroller, an electronic circuit for interfacing with the sensors and an energy source, usually a battery or an embedded form of energy harvesting. A sensor node might vary in size from that of a shoebox down to the size of a grain of dust, although functioning "motes" of genuine microscopic dimensions have yet to be created. The cost of sensor nodes is similarly variable, ranging from a few to hundreds of dollars, depending on the complexity of the individual sensor nodes. Size and cost constraints on sensor nodes result in corresponding constraints on resources such as energy, memory, computational speed and communications bandwidth. The topology of the WSNs can vary from a simple star network to an advanced multi-hop wireless mesh network. The propagation technique between the hops of the network can be routing or flooding. In computer science and telecommunications, wireless sensor networks are an active research area with numerous workshops and conferences arranged each year, for example IPSN, SenSys, and EWSN. Wellhope Wireless manufacture based in 5G 4G; MIMO;GPS Dielectric Antenna;GSM;3G;Wlan;LTE antenna and RF pigtail cable; more question or inquire feel free to sent us email; wh@wellhope-wireless.com.
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