There are many types of terminations for coaxial cables. Choosing the right termination method is crucial to ensuring the quality of signal transmission and the reliability of the system. The following are several common types of coaxial cable terminations and their characteristics:

　　1. SMA (Subminiature Version A) Connector

　　Features:

　　Miniature design: Suitable for applications with limited space.

　　Wide frequency range: Suitable for frequencies from DC to 18 GHz or even higher.

　　Threaded locking mechanism: Provides reliable mechanical connection.

　　Application:

　　Widely used in wireless communications, test equipment, microwave equipment and other fields.

　　2. BNC (Bayonet Neill-Concelman) Connector

　　Features:

　　Quick connection: Adopts bayonet locking mechanism for quick plugging and unplugging.

　　Frequency range: Suitable for frequency range from DC to 4 GHz.

　　Wide compatibility: Compatible with many types of coaxial cables.

　　Application:

　　Commonly used in video equipment, test instruments, radio equipment, etc.

　　3. TNC (Threaded Neill-Concelman) Connector

　　Features:

　　Threaded locking mechanism: More secure than BNC, suitable for high-frequency applications.

　　Frequency range: Applicable to the frequency range of DC to 11 GHz.

　　Strong environmental adaptability: Has good waterproof performance.

　　Application:

　　Applicable to scenarios requiring high reliability and high-frequency performance, such as military communications, mobile phone base stations, etc.

　　4. N-type connector

　　Features:

　　High power handling capability: Able to withstand higher RF power.

　　Wideband support: Applicable to the frequency range of DC to 11 GHz.

　　Thread locking mechanism: Provides a solid mechanical connection.

　　Application:

　　Widely used in antenna systems, radio communications, test equipment, etc.

　　5. F-type connector

　　Features:

　　Simple and economical: Simple structure and low cost.

　　Mainly used for low-frequency applications: Applicable to VHF/UHF bands, commonly used for TV and satellite reception.

　　Thread or crimp locking: Provides basic mechanical connection.

　　Application:

　　Mainly used in home TV and satellite reception systems.

　　6. UHF (Ultra High Frequency) Connector

　　Features:

　　Suitable for lower frequencies: mainly used in the frequency band of 30 MHz to 300 MHz.

　　Threaded locking mechanism: provides a reliable mechanical connection.

　　Large size: relatively large compared to other connectors.

　　Applications:

　　Commonly used in low-frequency applications such as amateur radio and walkie-talkies.

　　7. MCX (Micro Coaxial) Connector

　　Features:

　　Ultra-small design: suitable for applications with very limited space.

　　Wide frequency range: suitable for frequency range from DC to 6 GHz.

　　Bayonet locking: convenient for quick connection and disconnection.

　　Applications:

　　Widely used in portable devices, mobile phones, wireless LAN devices, etc.

　　8. MMCX (Micro-Miniature Coaxial) Connector

　　Features:

　　Extremely small size: suitable for highly compact designs.

　　Wide frequency range: suitable for frequency range from DC to 6 GHz.

　　Bayonet or threaded locking: two different locking mechanisms are available.

　　Applications:

　　Suitable for portable electronic devices, wireless modules, etc.

　　9. Lemo connector

　　Features:

　　Multi-contact design: can transmit multiple signals at the same time.

　　High-density layout: suitable for space-constrained applications that require multiple connectors.

　　Threaded or push-pull locking: provides a variety of locking mechanisms.

　　Applications:

　　Suitable for applications that require high-density connections such as test equipment, medical equipment, military communications, etc.

　　Termination methods

　　1. Crimping method

　　Use special tools to crimp the connector directly to the cable, which is suitable for mass production, fast and consistent.

　　2. Welding method

　　Solder the center conductor and shield of the cable to the corresponding parts of the connector respectively, which is suitable for hand-made, but attention should be paid to welding quality and thermal management.

　　3. Twist-on method

　　For some types of connectors (such as N-type), installation can be completed by simple twisting, which is suitable for on-site installation and maintenance.

　　4. Plug-in connection

　　Some connectors (such as MMCX) allow quick connection through plug-in method, which is particularly suitable for applications with frequent plugging and unplugging.

　　Selection guide

　　Determine the needs

　　Frequency range: Select the appropriate frequency range according to your specific application scenario.

　　Power handling capability: Consider the maximum power that the cable and connector can withstand.

　　Mechanical strength and durability: Select the appropriate mechanical locking mechanism and protection level based on the use environment.

　　Size constraints: Select miniaturized connectors when space is limited.

　　Technical requirements

　　Standing wave ratio (VSWR): Evaluate key performance parameters to ensure that the connector's VSWR meets the requirements.

　　Impedance matching: Ensure that the impedance between the cable and connector is well matched to reduce reflections and signal loss.

　　Environmental adaptability: Ensure that the selected connector can operate reliably in the expected working environment, including temperature changes, humidity, and other external factors.

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