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.

    You know a lot about the TNC RF connector. As an electronic component enthusiast, you can't know anything about the TNC RF connector. The following ROHO engineers will introduce you to the TNC RF connector. I hope that you will know about it. it works.     ROHO engineers pointed out that the TNC RF connector is a variant of the BNC connector. The TNC RF connector is a very common RF connector, the full name is Thread Neill-Concelman (threaded connector).     TNC RF connectors are manufactured according to what standards, do you know? The TNC series is a small and medium power connector with a threaded connection mechanism developed according to the US military standard MIL-C-39012. It has strong vibration resistance, high reliability, excellent mechanical and electrical performance, and is widely used in radio equipment and electronic instruments to connect RF coaxial cable. This series of products can be interchanged with the corresponding products of the international TNC series RF coaxial connectors.     After reading the above, you should have a preliminary understanding of the TNC RF connector. In the future, the small series will also explain the knowledge about the bnc connector, not to be missed! Of course, if you have TNC procurement Demand, click on the consultation to find out more. 

    RF connectors can be far and near in people’s lives, but in our daily life, they are inseparable from RF connectors. They play a major role in our daily lives, so we can learn more and Learn about RF connectors.     In addition to the requirements of general characteristics, RF coaxial connectors also have a very key requirement that they must be good in touch, reliable in work, and convenient in maintenance. The reliability of the work of the radio frequency connector will immediately endanger all the normal work of the airport power circuit, and even the misfortune of all the hosts. Therefore, the host power circuit has very strict requirements for the quality and stability of the radio frequency connector.     Therefore, the high quality and high reliability of the radio frequency connector make it widely used in aviation, aerospace, national defense and security and other military system software.     There are three common classifications of radio frequency connectors: appearance design, structure, and main purpose.     1. Appearance design     Circular RF connector: mostly used in military equipment (such as airlines, aerospace)     Rectangular RF connector: simple structure, mostly used for printed pcb circuit boards of electronic products      2. Structure     The composition of the fixed-end radio frequency connector (female contact-power socket) and the free end radio frequency connector (male contact-power plug). The power socket is fixed on the power consumption component according to its square (circle) plate (some or welding methods are selected). The power plug is generally connected to the cable, and the power plug and the power socket are connected according to the docking screw cap.     Structural features of radio frequency connector: resistant to natural environment, interface type (rapid) docking, multi-button (error insertion prevention), touch body     The three basic elements of the radio frequency connector are composed of the shell, the conductor and the insulator, the contact body and the transmission line riveting butt, (single root is easy to solve the common fault).     1) Shell     Refers to the housing, connection screw cap, and end fittings of the socket plug.     The function of the case is to protect the internal components of the radio frequency connector such as the conductor, the insulator, and the contact body (collectively called the pin socket) from being damaged. The precise positioning key slot on the top ensures the precise positioning of the power plug and the power socket. The connecting screw cap is used to connect and separate the power plug socket. The end fittings are used to maintain the connection between the power line and the touch body line from being damaged and to fix the cable.     The shell has the function of a certain magnet...

    Abstract: The rapid development of mobile communications has increased the demand for RF coaxial cables. Therefore, analyzing the attenuation factors of coaxial cables is of great significance to our scientific decision-making.     This article focuses on the analysis of factors that affect the attenuation of RF coaxial cables, including raw materials, standing wave cable structure and temperature. I. Overview     Attenuation is one of the most important parameters of radio frequency cables. It reflects the loss of electromagnetic energy during cable transmission.     The attenuation of the cable indicates the degree of power transmission or voltage loss when the cable is working in the traveling wave state.     The greater the attenuation of the cable, the more serious the signal loss, and the worse the transmission efficiency of the cable. If the total attenuation of the cable is equal to 3dB, it means that the current or voltage amplitude of the signal bath after the cable is transmitted is reduced by about 30%, and the signal power Decrease by 50%.     Therefore, the attenuation of the cable is a very important indicator. This is especially true for long-length transmission. In order to reduce the attenuation of the cable, a considerable cost must be drawn economically.     When choosing a cable, it cannot be considered that the lower the attenuation, the better, but this index and other factors must be considered comprehensively to select an economical and suitable cable.      2. Overview of factors affecting the attenuation of RF coaxial cables     RF cables are mainly composed of conductors, insulation, sheaths and armors. Among them, the conductors play the guiding role of electrical signals. Insulation is the medium on which electrical signals are transmitted. Sheath and armor are necessary for conductors and insulation. The protection of the cable makes the finished cable endure the effects of various use environments.     Therefore, the main factors affecting RF coaxial cables can be summarized into three categories: raw materials, cable structure and temperature.     1. Raw materials     1.1 Insulation layer     Insulation is the medium for radio frequency signal transmission. The material and structure of the insulation are required to ensure the lowest possible loss of the cable, and it must also have sufficient mechanical strength to keep the inner and outer conductors in the coaxial position. The radio frequency cable insulation can be divided into solid, air and semi-core. Air insulation.     The influence of insulation on the attenuation is smaller, but its influence continues to increase as the frequency increases. When it reaches the 2GHz frequency band, the attenuation of the medium cannot be ignored.     Since the insulation layer basically adopts a foamed structure, f...

    RF coaxial connectors are abbreviated as RF connectors. You know it. It is generally considered as an element attached to a cable or to an installation instrument as an electrical connecting or separating element of the transmission line. It belongs to mechatronic products. In simple terms, it serves as a bridge.     First，the radio frequency connector naming method     The model of the universal RF connector consists of two parts: the main code and the structure form code. The middle is separated by a dash "-". Other conditions that need to be specified can be specified in the detailed specification and separated by a dash.     Second, RF connector code description.     1. 17 kinds of appearance code introduction      (1)  Type N: Threaded RF coaxial connectors with an inner diameter of the outer conductor of 7mm (0.276 inch) and a characteristic impedance of 50 ohms (75 ohms). (IEC169-16)     (2)  BNC Type: Bayonet locking RF coaxial connector with inner diameter of outer conductor of 6.5mm (0.256 inch) and characteristic impedance of 50Ω. (IEC169-8)     (3)  Type TNC: Threaded RF coaxial connector with outer diameter of outer conductor of 6.5mm (0.256 inch) and characteristic impedance of 50Ω. (IEC169-17)     (4)  Type SMA: Threaded RF coaxial connector with inner diameter of outer conductor of 4.13mm (0.163 inch) and characteristic impedance of 50Ω. (IEC169-15)     (5)  SMB type: push-lock RF coaxial connector with inner diameter of outer conductor of 3mm (0.12 inch) and characteristic impedance of 50Ω. (IEC169-10)     (6)  SMC type: RF coaxial connector with inner diameter of outer conductor of 3mm (0.12 inch) and characteristic impedance of 50Ω. (IEC169-9)     (7)  SSMA Type: RF coaxial connector with inner diameter of outer conductor of 2.79mm (0.11 inch) and characteristic impedance of 50Ω. (IEC169-18)     (8)  SSMB Type: Push-locked RF coaxial connector with inner diameter of outer conductor of 2.08mm (0.082 inch) and characteristic impedance of 50Ω. (IEC169-19)     (9)  SSMC type: RF coaxial connector with inner diameter of outer conductor of 2.08mm (0.082 inch) and characteristic impedance of 50Ω. (IEC169-20)     (10)  Type SC (SC-A and SC-B type): RF coaxial connector with inner diameter of outer conductor of 9.5mm (0.374 inch) and characteristic impedance of 50Ω (two types with different types of connecting threads). (IEC169-21)     (11)  APC7 Type: Precision medium-sized RF coaxial connector with inner diameter of outer conductor of 7mm (0.276 inch) and characteristic impedance of 50Ω. (IEC457-2)     (12)  APC3.5 Type: RF coaxial connector with inner diameter of outer conductor of 3.5mm (0.138 inch) and characteristic impedance of 50&Omega...

    RF Coaxial connectors can be used to transmit radio frequency signals with a transmission frequency range of up to 110 GHz. It has the advantages of small size, light weight, convenient use, etc., and is widely used in fields such as radar, communications, data transmission and aerospace equipment. With the development of these industries, the requirements for coaxial RF connectors are getting higher and higher, and the demand is also increasing.     The coaxial RF connector can be used to extend the RF cable or customize the RF cable on site. If you want to buy a suitable connector product, you should first know its characteristics.     1. There are many varieties and specifications. There are more than 20 international universal series of radio frequency coaxial connectors, with many subdivided varieties and specifications, so you need to distinguish carefully when purchasing.     2. Ensure electrical characteristics through mechanical structure. The radio frequency coaxial connector is a mechatronic product, which is essentially different from other low-frequency connectors. The quality of the mechanical structure directly determines the quality of the product.     3. The processing method of the part. The radio frequency coaxial connector is mainly processed by a lathe, and it is difficult to automatically assemble because of many manual operations. Therefore, the production cycle is longer than other connectors.     4. Product updates are slow. Coaxial RF connectors appeared relatively late, and current updates are relatively slow. There are several major signals in the market.     5. Production technology. Radio frequency coaxial connectors are labor-intensive products with a certain technical content, which require high production capacity of manufacturers.     6. Reasons for failure. The failure modes and mechanisms of RF coaxial connectors are complex, and professional RF engineers are required to perform failure analysis.