The selection of RF coaxial connectors should take into account both performance requirements and economic factors. Performance must meet the requirements of the system's electrical equipment, and economically, it must satisfy the needs of value engineering. In principle, the following four aspects should be considered when choosing a connector:
Connector Interfaces (SMA, SMB, BNC, etc.)
2. Electrical Performance, Cables, and Cable Accessories
3. Terminal Forms (Printed Circuit Boards, Cables, Panels, etc.)
4. Mechanical Structure and Coatingjun utilizesNo Chinese content provided.)
Connector Interface
Connector interfaces are typically determined by their application, but they must also meet both electrical and mechanical performance requirements.
BMA connectors are designed for blind mating in low-power microwave systems up to 18GHz frequencies.
The BNC connector is used for bayonet connections, predominantly for radio frequency connections below 4GHz, and is widely applied in network systems, instruments, and computer interconnections.
TNC interfaces are similar to BNC except for the screws, and remain functional at 11GHz, demonstrating excellent performance under vibration conditions.
SMA threaded connectors are widely used in aviation, radar, microwave communication, and digital communication.Jun utilizesIn the civil sector.
SMB connectors are smaller than SMA, featuring an insertion-latch structure for quick and convenient connection.
Similar to SMB, SMC features a screw that ensures enhanced mechanical performance and a broader frequency range, mainly used in military or high-vibration environments.
The N-type screw connector utilizes air as an insulating material, offering cost-effectiveness with impedance ratings of 50Ω and 75Ω, and frequency capabilities up to 11GHz. It is commonly used in local area networks, media transmission, and testing equipment.
MCX's nMCX and MMCX series connectors are compact in size and offer reliable contact. They meet the demands for miniaturization and density, presenting a wide range of applications.
No Chinese content provided.Electrical performance, cables, and cable accessories.
Impedance:
Connectors should be impedance-matched to the system and cables. It's important to note that not all connector interfaces meetImpedance of 50Ω or 75Ω; impedance mismatch can lead to a decrease in system performance.
② Voltage:
Ensure that the voltage does not exceed the connector's maximum耐受 voltage during use.
③. Higher Work Frequency:
Each connector has a higher working frequency limit, some commercial or75n Design haszuiMinor frequency restrictions. In addition to electrical performance, each interface form has its own unique features, such as...:BNC connectors are widely used for low-performance electrical connections due to their ease of installation and affordability; SMA and TNC series are designed for nut connections, meeting the requirements of connectors in high-vibration environments. SMB connectors feature quick connect and disconnect capabilities, thus gaining increasing popularity among users.
④. Cable:
Television cables are typically used in systems that only consider impedance, due to their lower shielding performance, with the TV antenna being a classic application.
⑤. Cable Installation:
There are mainly two methods for connector installation.(1) Weld the center conductor, and tighten the shielding layer. (2) Coil the center conductor and the shielding layer. Other methods are derived from the above two methods.
ThreeTerminal Form
The connector is suitable for radio frequency coaxial cables, printed circuit boards, and other connection interfaces. Practice has proven that a specific type of connector is matched with a specific type of cable; typically, cables with a smaller outer diameter are used.SMA, SMB, and SMC coaxial connectors for small connections.
Four. Mechanical Structure and Coating
The structure of connectors greatly affects their price. Each connector's design includesjun utilizesStandards and commercial standards.MIL-C-39012，jun usesThe standard is made from all copper parts, PTFE insulation, and gold plating on both sides. The commercial standard design utilizes inexpensive materials such as brass casting, polypropylene insulation, and silver plating.
