What are the indicators that affect the SIM card holder connector?
The use of connectors such as SIM card holders has gradually become an indispensable electronic accessory in the electronic product industry. Card holder connectors are one of the commonly used connectors in mobile phones and computers. SIM card holders are SIM card reading devices for mobile phones and are one of the important accessories used in mobile phones. Below, the editor of Hanbo will talk about the performance indicators of connectors.
1. Characteristic impedance, like other microwave devices, is a very important indicator that directly affects the standing wave ratio, operating frequency, and insertion loss. The common characteristic impedances of connectors are 50 Ω and 75 Ω.
2. As the name suggests, the contact resistance of a RF connector refers to the resistance at its contact point, which refers to the contact resistance of the inner conductor and the outer conductor, respectively. Obviously, the smaller the value, the better, usually at the level of m Ω. The contact resistance of the outer conductor is smaller than that of the inner conductor.
3. The lower limit cutoff frequency of the RF coaxial connector in the operating frequency range is zero, and its upper limit operating frequency is 95% of the cutoff frequency. The working frequency depends on the structure of the connector. Generally speaking, the smaller the size of the outer conductor, the higher the working frequency of the connector: the lower the dielectric constant of the filled medium, the higher the working frequency, and the lower the insertion loss. The maximum operating frequency of coaxial connectors can reach 110GHz.
4. The connection torque of connectors is related to the matching torque of connectors, and the indicators provided by different manufacturers are not completely consistent, because the materials used are different. The mating torque of stainless steel connectors should be greater than that of copper connectors. The greater the mating torque, the higher the durability of the connector
5. Insulation resistance refers to the resistance of an insulation material, which depends on the insulation material inside the joint, such as polytetrafluoroethylene. The typical value of insulation resistance is greater than 5G Ω (N-type). When this indicator is not good, leakage current will occur.
6. The durability of a connector (plug and unplug life) is considered as one plug and unplug when the connector completes a cycle of complete engagement and complete separation from the standard connector it is connected to. At MIL_ The C-39012 standard specifies the insertion and removal life of RF connectors. If the N-type connector is plugged and unplugged 12 times per minute, the plug and unplug life should not be less than 500 times. After plugging and unplugging 500 times, the connector should have no obvious mechanical damage, and all matching functions should remain unchanged,
For testing cable components, the lifespan of the connector means that after completing the specified number of plugs and unplugs, the VSWR and insertion loss of the cable component should still remain within the range specified in the product manual.
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