What is the difference between the use of BNC RF connectors and SMA connectors, and is it really important whether the characteristic impedance is 50 or 75? Can’t they be mixed?     SMA connector     The applicable frequency range is 0 ~ 18GHz. It is an ultra-small, suitable for semi-rigid or flexible RF coaxial cable connection. It has the characteristics of small size, superior performance, high reliability and long service life. However, the ultra-small connector is easy to be damaged in engineering, which is suitable for microwave applications that require high performance, such as the internal connection of microwave equipment.     BNC connector     The applicable frequency range is 0 ~ 4GHz, which is a low-power coaxial cable connector with a bayonet connection mechanism. This connector can be quickly connected and separated, has the characteristics of reliable connection, good vibration resistance, convenient connection and separation, etc. It is suitable for occasions of frequent connection and separation, and is widely used to connect coaxial radio frequency cables in radio equipment and test instruments.     The characteristic impedance is very important, otherwise it will cause mismatch. When the impedance is matched, the maximum output power can be obtained and the equipment has the highest utilization efficiency. When the impedance does not match, the effective output power will be reduced. When the external impedance is equal to the internal impedance of the device, it will become impedance match.     You should understand the difference between the use of BNC connectors and SMA connectors. BNC connector and SMA connector are two different products, each of which has different uses, and there are also differences in performance, and cannot be mixed.

    Commonly used rf microwave devices are generally divided into: microwave diode, RF attenuation plate, amplifier.     Microwave diode generally refers to the working in the microwave frequency band of the diode, belongs to solid state microwave devices.The microwave band usually refers to the frequency range from 300MHZ to 3000GHZ.     Main parameters of microwave diode:     1. Cut-off frequency, which determines the maximum diode use frequency.     2. Frequency conversion loss, the ability to achieve diode frequency change, and diode characteristics, mixer circuit formation and working state is closely related.     3. The noise ratio is mainly divided into shotgun noise and thermal noise.     RF Attenuator is a kind of important fiber optics passive device, which is an indispensable device in optical fiber CATV.It is well known that when two segments of optical fiber are connected, considerable alignment accuracy must be achieved in order for the optical signal to be transmitted with little loss.Conversely, if the optical fiber alignment accuracy is adjusted appropriately, the attenuation can be controlled.According to this principle, the displacement optical attenuation plate is intended to make the optical fiber in the docking, a certain dislocation.The light energy is lost to control the attenuation.     An amplifier is a device for amplifying the voltage or power of an input signal. It consists of a tube or transistor, a power transformer, and other electrical components.Application in communication, broadcasting, radar, television, automatic control and other devices.Its function is to amplify the power of the high-frequency modulated wave signal to meet the transmission power requirements, and then radiate it to the space through the antenna, so as to ensure that the receiver in a certain area can receive a satisfactory signal level and not interfere with the communication of adjacent channels.     Amplifier product performance: a certain power output, and small misalignment and drift, high input impedance and low output impedance, as well as high sensitivity, stability and reliability, small size, light weight, less power consumption.

    The N Type RF connector is also used as a company to purchase it in defense and industrial and commercial communication products. How can you judge cost-effective products when purchasing N Type RF connectors?     The following 3 points must be noted when purchasing:     1. High quality raw materials, RoHS compliant and durable     2, excellent RF performance from DC to 11GHz, and scalable range design to DC to 18GHz     3, the thread connection mechanism is reasonable, strong anti-vibration ability     The N Type RF connector has consistent performance at 11 GHz with a threaded connection mechanism that is fully interchangeable with MIL-C-39012 compliant N-RF connectors for all systems where superior RF performance and mechanical performance are The key is generally used in antennas, base stations, instrument satellite systems, wireless LANs, radar systems, broadcasts, etc.     The quality of work and materials of RF connectors often affect the speed of data transmission. The quality of the signal transmission and the smoothness of the connection are directly related to the performance and stability of the system and its service life. “Five Essentials” is designed as a “lightweight, miniaturized, low-cost, high-performance, mass-produced” connector. The higher the N Type RF connector requirements, the more stringent the material selection and process.

    In recent years, society has gradually moved towards the era of intelligence. Artificial intelligence (AI) is considered an important part of the fourth industrial revolution. Smart homes, unmanned supermarkets, connected cars, smart transportation, smart cities, etc. The concept has already begun to be implemented.     These are the complete set of intelligent processes through intelligent identification, processing, and feedback.     If AI is compared to the human brain and intelligent hardware to the human body, then the connector is equivalent to the human meridian and plays an indispensable role.     It can be said that the rapid development of AI is accelerating the development process of the connector industry.     A large number of revolutionary high-tech electronic products enable connector manufacturers to accelerate the pace of research and development.     In particular, domestic connector manufacturers do not have an advantage in their technical level. In the era of intelligence, it is necessary to accelerate the pace of research and development and meet the needs of high-tech development in order to gain a foothold in the future.     So with the emergence of AI, where is the development direction of RF coxial connectors?     1. Precision. This is inevitable under the current framework. Human needs continue to increase, and more and more smart devices are miniaturized and sophisticated, such as smart phones, wearable devices, etc., and the space for connectors is greatly restricted. Miniaturization and precision are the future development trend.     2. High-speed transmission. AI does not mean having the best computing power. The key is to master a huge amount of data. AI means that the operation speed is very fast, which requires the connector to provide high-speed transmission functions.     3. Stable. Whether it is now or in the future, security and stability have always been a very important issue, especially in the AI era. The stability of the big data transmission signal is the primary problem we want to solve.     4. Intelligent. We can imagine what will happen if the connector becomes intelligent, every link is becoming intelligent, the pattern of the connector industry will be reshuffled, and the human-machine collaboration will be fully integrated in the future.     The emergence of artificial intelligence has brought many conveniences to life, and it has also brought huge changes to all walks of life. Many domestic companies have already taken the lead in participating in this intelligent era, such as Alibaba, JD.com, Baidu, etc. Domestic connector companies need to speed up their pace and keep up with the great era of intelligent development.

    IPEX connector are widely used in mobile phones, digital cameras, computers, switches, routers, GPS navigation, wireless network cards, LCD monitors, household appliances, automotive electronics, etc. IPEX RF connectors are different in different connector sizes. The size of the other RF connectors is small, and the feeders used can be made very thin.     IPEX connector holders are used when space requirements are high. So what type of size does the IPEX connector have? Let's take a look at it by ROHO.     The connector sizes are as follows:     1. IPEX sealed connectors are: MX120G, MX64, MXP120, MX150L     2. IPEX automotive connector specifications are: MX123, CMC and CMX sealed hybrid module connector.

    With the development of science and the upgrading of the global positioning system, GPS antenna in the field of professional and business, such as convoys, exploration of science and technology, military tracking and other consumption products occupy very important position, then what is the role of it?     The first is to capture satellites and receive satellite positioning information, which is radiation and electromagnetic waves. Any high frequency circuit, as long as it is not completely shielded, can radiate electromagnetic waves more or less to the surrounding space, or receive electromagnetic waves more or less from the surrounding space.     The second function is to change the electromagnetic energy of the radio signal sent by the satellite into the current that can be absorbed by the electronic device of the receiver, that is, the energy conversion. For special equipment or car equipment, the equipment and GPS receiver module before tend to have a certain distance, so in a real environment may use more than 1 meter of feeder cable, but since there are many signal loss for feeder cable, so in this environment can only choose active GPS antenna.

    As to RF connectors.There is a product series which named Q9. What are the differences between BNC and Q9 connectors？It’s believed that many people do not know the answer. ROHO will introduce the knowledge of Q9 and BNC connectors as below for you so that you can tell them apart easier.     BNC RF connectors (flat patternmaking )     The full name of bnc connector is Bayonet Neill-concelman. The literal translation is Neil-Consemman,It is consisted of a central pin,a jacket and the a SD.The outline of Q9 connector is almost the same with bnc connector.so that the layman can’t tell then apart at all.even many people have monopoly in bnc connectors also don’t know the difference about the Q9 connnector and bnc connector.     Consequently, many people sold the Q9 connector as bnc connector.     The difference between BNC connector and Q9 connector:the standard dimension of bnc is feet.specificly showed in the core (the red circle pointed by the arraows in the below picture),rubber core of bnc is thinner and further form the edge(3.8mm) than Q9 connector.Q9 is thicker and closer form the edge.     Q9 connector (flat patternmaking)     Q9 and bnc like the DB9 a couple of male and female .they are applied in the oscilloscope,signal generator ect.The caliber of Q9 and bnc have a little difference.     The central gap of bnc female is slightly bigger than Q9,Generally.The oscilloscope use bnc,Q9 is also can be pluged in.and if works for a long time,it will go wrong.The head of another half is marked.you will find that if more carefully observation.50 ohm is suitable for transfer power.75 ohm is suitable for transfer signal.the digital cable must be 75 ohm.

    Many practitioners may don’t have a good knowledge about the differences about 3.5mm/2.92mm/2.4mm/SMA,As a menber of ROHO. I’m really happy to share the knowledge of these four connectors with you and hope this knowledges will help you. Many users may meet this problem. 3.5mm/2.92mm/2.4mm,  connectors,which one can seamless connect with SMA.First we should learn to tell these connectors apart before answering the question.     At the baginnig. SMA is designed for 0.141semi-rigid coaxial cable.and usually filled with ptfe medium.In the army industries ,they are used as precision connectors for microwave applications.At that condition.since SMA is small in small size and can work in high frequency. (Frequency range of semi-hard cable is DC～18GHz,and the soft cable is DC～12.4GHz)They are popular quickly.Even the Millimeter wave connectors developed later (for example:3.5mm、2.92mm) also take the mechanical compatibility into consideration.     What is 3.5mm connectors? The outer diameter is 3.5mm.The impedance is 50Ω.The bindiny mechanism is 1/4-36UNS-2 English thread Connector.The biggest difference betweem SMA is 3.5mm is use air dielectric.The outer conductor of 3.5mm connectors is thicker than SMA connector.The mechanical strength of 3.5mm connectors is better than SMA connectors.Not only the behaviour of electricity of 3.5mm connectors is better than SMA connectors’ .but also mechanical endurance and repeatability of performance are higher than SMA connectors.So they are suitble for used in testing industries.     The Outer diameter of the 2.92mm connectors is 2.92mm.The impedance is 50Ω.The bindiny mechanism is 1/4-36UNS-2 English thread coaxial Connector.the structure of 2.92 connectors are similar with 3.5 connectors.but smaller than 3.5 connectors. 2.92 connectors’ frequency is DC～46GHz.they have good electrical property and can be compatied with SMA connectors and 3.5mm connectors.So 2.92 connectors are soon accepted by manufacturers. And became one of the most widely used millimeter wave connectors in the globle world.     The outer diameter of the 2.4mm connectors is 2.4mm.The impedance is 50Ω.The outer diameter of the 1.85mm connectors is 1.85mm.The impedance is 50Ω.They have smaller inside dimension.and higher working frequency.nominal can up to 50GHz 60GHz,     This two connectors are mechanical compatible and can connect with each other. But please note that they can’t be connected with 2.92mm，3.5mm and SMA connectors. If connect with 2.92mm，3.5mm and SMA connectors.They will be broken down.