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  • SMD is what is the difference between SMT and SMD
    SMD is what is the difference between SMT and SMD 2022-05-16
    SMD is what is the difference between SMT and SMD https://www.whwireless.com/  Estimated 2minutes to finish reading   When it comes to SMD, you may not know what it is? But mention the SMT mounter, may be a lot of people know, today by the SMT mounter of the editor to tell you what is the difference between SMD and SMT, the following we come together to understand it:.   Speaking of SMD, we may not know what it is? But mention the SMT mounter, many people may know, today by the SMT mounter of the editor to tell you what is the difference between SMD and SMT, the following we come together to understand it. SMD is the abbreviation of Surface Mounted Devices, meaning: surface mount devices, it is SMT (Surface Mount Technology) components in one, including CHIP, SOP, SOJ, PLCC, LCCC, QFP, BGA, CSP, FC, MCM, etc..   Surface mount components were introduced some twenty years ago and have since ushered in a new era. From passive components to active components and integrated circuits, they eventually became surface mount devices (SMD) and could be assembled by pick-and-place devices. For a long time it was thought that all pinout components would eventually be available in SMD packages.   SMT stands for Surface Mount Technology and is currently one of the most popular technologies and processes in the electronic assembly industry.   SMT is a new generation of electronic assembly technology that compresses traditional electronic components into devices that are only a few tenths of their size, thus achieving high density, high reliability, miniaturisation, low cost and automation in the assembly of electronic products. Such miniaturised components are called: SMD devices (or SMC, sheet devices). The process method for assembling the components onto a printed board PCB is called the SMT process https://www.whwireless.com/ 
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  • Antenna transmission distance not ideal? It may be due to the following 6 reasons
    Antenna transmission distance not ideal? It may be due to the following 6 reasons 2022-04-16
    Antenna transmission distance not ideal? It may be due to the following 6 reasons https://www.whwireless.com/  Estimated 2minutes to finish reading When using wireless modules, communication distance has always been an important indicator. Many engineers ensure that the wireless module itself has no problems, but still the communication distance is unsatisfactory, the packet loss rate is high, the signal is weak and so on. At this time, we should consider whether the performance of the antenna has affected the communication distance of the module. Affect the performance of the antenna often have the following 6 factors, I hope it will help you! 1. the antenna frequency must be matched with the frequency of the wireless module. 2. the higher the antenna frequency, the faster the rate; the lower the frequency, the longer the wavelength, the better the bypass performance. 3. when there is a linear communication barrier, the communication distance will be correspondingly attenuated. 4. pay attention to the direction of antenna radiation, incorrect antenna installation direction leads to close transmission distance 5. there are metal objects near the antenna or placed in the metal shell, the signal attenuation will be very serious. 6. poor impedance matching between antenna and communication equipment will lead to poor communication effect. 7. The ground absorbs radio waves, the effect of testing near the ground is poor, it is recommended to raise the height of the antenna. 8. Water will absorb electromagnetic waves, the higher the frequency, the more obvious the electromagnetic wave attenuation phenomenon. www.whwireless.com 
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  • Principle and calculation of quarter wavelength antennas
    Principle and calculation of quarter wavelength antennas 2022-03-14
    Principle and calculation of quarter wavelength antennas https://www.whwireless.com/  Estimated 5 minutes to finish reading Quarter wavelength antennas are more common in areas such as walkie-talkies, and their name is more technical than that of antennas that are distinguished by their shape. In this article, we will further discuss the characteristics of the quarter wavelength antenna by looking at the principles and applications of this antenna. First, the antenna's transmission principle Regarding the quarter wavelength antenna, we need to understand the basic principle of the antenna's emission first. Electricity travels through a conductor at a speed close to that of light, and when it encounters a discontinuity in the conductor, it is reflected back to the signal source. If the current is alternating and the reflected current returns to the origin or feed point at the right moment, then the current is reinforced by the subsequent cycles so that only a small amount of energy is required to maintain a standing wave within the antenna. That is, due to the presence of standing waves so that the antenna is in a resonant state. Thus transmitting electric waves into space. In the resonant state, the voltage in the current for the maximum of the midpoint (oscillator of the midpoint) is very little, but at both ends there is a great value, Ohm's law applies to the antenna, in the midpoint due to the current, the voltage is low, so the resistance is small, at both ends of the situation is exactly the opposite, thus the impedance is high.   Second, the principle and application of quarter wavelength antenna According to the theory of transmission line, 1/4 wavelength open line is equivalent to a series resonant circuit, so its entire load is purely resistive, in some occasions, due to environmental factors, the length of the antenna is often limited, so there is a loaded antenna. According to the theory of transmission line, the length of the antenna is less than 1/4 wavelength multiples of its impedance is capacitive, when the antenna does not resonate, for this reason we can add an inductor on the antenna to balance with the antenna, so that the antenna resonance, we call this antenna for loading antenna. Theoretical and practical evidence, when the length of the antenna for the radio signal wavelength of 1/4, the antenna transmission and reception conversion efficiency is high. Compared to one-half wavelength, full wavelength, antenna size is much smaller, compared to the antenna transmitting and receiving efficiency and the highest ratio of antenna size, so commonly used quarter wavelength antenna. Third, how to calculate the quarter wavelength A quarter wavelength can be calculated by frequency, the formula is: the length of the antenna (in meters) = (300/f) * 0.25 * 0.96, f indicates the frequency in MHz, 0.96 is the wavelength shortening rate (electromagnetic wave propagation in the antenna, some factors lead to wavelength shortening...
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  • How to install outdoor antenna? Introduction to 5 specifications
    How to install outdoor antenna? Introduction to 5 specifications February 17,2022.
    How to install outdoor antenna? Introduction to 5 specifications https://www.whwireless.com/ Estimated 5 minutes to finish reading Compared with the indoor antenna, the outdoor antenna needs to consider the surrounding complex environment, and there will be many points to pay attention to in the installation. This paper will focus on the five installation specifications of outdoor antenna and introduce how to operate it correctly. 1、 Tower side installation of directional antenna 2.4 GHz, 14 DBI, 90 ° sector antenna, vertical polarization, integrated n-type female connector In order to reduce the influence of the antenna tower on the antenna directivity pattern, it should be noted during installation that the distance from the center of the directional antenna to the tower is λ/ 4 or 3 λ/ 4, the maximum directivity outside the tower can be obtained. 2、 Tower side installation of omnidirectional antenna 2.4 GHz 7 DBI omnidirectional Mini Pro Series antenna - n-type female connector In order to reduce the influence of the antenna tower on the antenna directivity pattern, in principle, the antenna tower cannot become the reflector of the antenna. Therefore, during installation, the antenna should always be installed on the edges and corners, and the nearest distance between the antenna and any part of the tower should be greater than λ。 3、 Multi antenna common tower To minimize the coupling and interaction between the receiving and transmitting antennas of different networks, and try to increase the isolation between antennas, the best way is to increase the distance between them. When the antenna is in the same tower, the vertical installation shall be preferred. 4、 Traditional monopolar antenna (vertical polarization) Due to the isolation (≥ 30dB) between antennas (rx-tx, tx-tx) and the requirements of spatial diversity technology, there is a certain horizontal and vertical separation distance between antennas. Generally, the vertical distance is about 50cm and the horizontal distance is about 4.5m. At this time, infrastructure investment must be increased to expand the platform for installing antennas. 5、 Dual polarization antenna (± 45 ° polarization) Since the polarization orthogonality of ± 45 ° can ensure that the isolation between + 45 ° and - 45 ° antennas can meet the requirements of intermodulation on the isolation between antennas (≥ 30dB), the spatial spacing between dual polarization antennas only needs 20-30cm. The mobile base station does not need to build an iron tower, but only needs to erect an iron column with a diameter of 20cm, and fix the dual polarization antenna on the iron column according to the corresponding coverage direction. Antenna spacing: 1. Diversity receiving antenna in the same cell: > 3M 2. Horizontal spacing of omnidirectional antenna: > 4m 3. Horizontal spacing of directional antenna: > 2.5m 4. Vertical spacing of antennas on different platforms: > 1m It should also be noted that the transceiver an...
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