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Xuntong Electronics was established in 2000 and is located in Yangzhou City, Jiangsu Province. The initial scale was small, with only two initial manual machines, simple product processing for some customers, and only two (2) employees. Founder Guan Zhong( Carlos Guan)’s original vision was to find a job for ourselves. Since our establishment, we have accepted thousands of large and small orders from companies. When we found that the industry was occupied by some low-quality products and prices, we decided to make choices for our customers , We abandon more cheap goods orders and choose the supply of high-quality products. We firmly believe that every customer's purchase is not only for cheap, but also for a good user experience or better signal transmission Guarantee. This vision promotes our particularity and also plays a vital role in guiding the leading ideas of our company.
RF coaxial connector

The radio frequency coaxial connector (hereinafter referred to as the RF connector) is usually regarded as a component attached to a cable or installed on an instrument as a component for electrical connection or separation of transmission lines. It is a mechatronic product. Simply speaking, it mainly serves as a bridge.

Development Overview
The radio frequency coaxial connector (hereinafter referred to as the RF connector) is usually regarded as a component attached to a cable or installed on an instrument as a component for electrical connection or separation of transmission lines. It is a mechatronic product. Simply speaking, it mainly serves as a bridge. Compared with other electronic components, the development history of RF connectors is shorter. The UHF connector that appeared in 1930 was the earliest RF connector. During the Second World War, due to the urgent needs of the war, with the development of radar, radio and microwave communications, medium series such as N, C, BNC, TNC, etc. were produced. After 1958, small products such as SMA, SMB, and SMC appeared. In 1964, the US military standard MIL-C-39012 "General Specification for Radio Frequency Coaxial Connectors" was formulated. Since then, RF connectors have begun to develop in the direction of standardization, serialization and generalization. In more than sixty years, through the joint efforts of experts from various countries, the RF connector has formed an independent and complete professional system and has become an important part of the connector family. It is an indispensable key component of the coaxial transmission system. The development technology of RF connectors in the United States, Britain, France and other countries is in a leading position. Its design, production, testing, and use technologies have become a complete set and tend to be perfect. Not only has it formed a complete standard system, but also raw materials, auxiliary materials, testing systems, Assembly tools have also been standardized, and specialized scale production has been carried out.

Professional features
1. Many varieties and specifications: more than 20 international general series, more varieties and specifications. 2. Relying on mechanical structure to ensure electrical characteristics, it is a mechatronics product, which is essentially different from other low-frequency connectors. 3. The part processing is mainly turning machine processing, and there are many manual assembly operations, which makes it difficult to carry out automatic assembly. 4. Slow product update. 5. It is an important part of the electrical connector, which is a labor-intensive product with a certain technical content. 6. Product reliability, failure modes and failure mechanisms are complex.

Industry Status
my country started to develop and produce RF connectors by the complete machine factory in the 1960s. Production began in the 1970s by professional manufacturers. Before the 1980s, it followed the policy of self-reliance and mainly imitated Soviet products. Since the 1980s, international standards have been adopted to develop and produce international general-purpose products, mainly state-owned and collective enterprises. Some private, Joint ventures and foreign-funded enterprises. There are hundreds of domestic RF connector manufacturers, but the scale is not large. The production methods of key manufacturers and the production level of general connectors are comparable to those of foreign countries.

Facing problem
1. The strength is weak and the scale is too small. 2. The concept of participating in market competition is outdated, and the civilian product market has been sold below cost, and other unfair competition has also appeared. 3. Poor globalization awareness, unable to adapt to the needs of the new economic era. 4. Digitalization and e-commerce management are backward. 5. There is no RF connector major in universities and colleges, resulting in a shortage of professionals. 6. The continuous influx of foreign capital and localized production. 7. The technology of precision connector and surface mount connector is backward. 8. The problem of passive intermodulation has not attracted enough attention.

development trend
1. Miniaturization With the miniaturization of the whole system, the size of RF connectors is getting smaller and smaller, such as SSMB, MMCX and other series, which are very small. 2. High frequency As early as a few years ago, HP in the United States introduced RF connectors with a frequency of 110 GHz. The frequency of domestic general products does not exceed 40GHz. The frequency of flexible cables does not exceed 10GHz, and the frequency of semi-rigid cables does not exceed 20GHz. 3. Multifunctional In addition to acting as a bridge, it also has signal processing functions, such as filtering, phase modulation, frequency mixing, attenuation, detection, and amplitude limiting. 4. Low standing wave, low loss Meet the needs of weapon systems and precision measurement. 5. Large capacity, high power Mainly to meet the development needs of the information superhighway.

Common professional terms
1. Connector: A detachable component (except for adapters) usually installed on cables or equipment for electrical connection of transmission line systems. 2. RF connector: It is a connector used in the radio frequency range. 3. Video: Radio waves with a frequency range of 3HZ∽30MHZ. 4. Radio frequency: radio waves with a frequency range of 3,000HZ∽3000GHZ. 5. High frequency: radio waves with a frequency range of 3MHZ∽30MHZ. 6. Coaxial: The inner conductor has a dielectric support, and the structure can obtain the smallest internal reflection coefficient in the frequency range used in the measurement. 7. Triaxial: A transmission line composed of three layers of concentric conductors with a common axis and insulated from each other. 8. Grade: The level of the connector in terms of mechanical and electrical precision, especially in terms of the specified reflection coefficient. 9. Universal connector (level 2): ​​a connector that is manufactured with the widest allowable dimensional deviation (tolerance), but can still guarantee the minimum specified performance and interoperability. Note: The requirements for reflection coefficient may or may not be specified. 10. High-performance connector (level 1): a connector that specifies the limit value of the reflection coefficient according to frequency changes. Generally, the specified dimensional tolerance is not stricter than the corresponding level 2 connector, but it is necessary to ensure that the connector meets the reflection coefficient. When required, the manufacturer is responsible for choosing tighter tolerances. 11. Standard test connector (level 0): a specific type of precision-manufactured connector used to measure the reflection coefficient of level 1 and level 2 connectors. The error caused by the measurement result can be ignored. Note: The standard test connector is usually part of the adapter between different types, and the connection between the adapter and the precision connector constitutes a part of the test equipment.
12、密封
   .1 Sealed connector: a connector that can meet the specified gas, moisture or liquid tightness requirements.
   .2 Barrier seal: a seal that prevents gas, moisture or liquid from entering the connector housing along the axial direction.
   .3 Panel sealing: prevent gas, moisture or liquid from entering the seal between the fixed or adapter housing and the panel through the mounting hole.
Note: The seal is usually provided as a separate product.
   .4 Mating surface seal: a seal to prevent gas, moisture or liquid from entering the interface of a pair of mating connectors.
   .5 Hermetic seal: the seal that meets the requirements of test Qk in IEC60068-2-17 "Basic Environmental Test Procedure Part 2: Test-Test Q: Seal".

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