Compared with the outer conductor, the inner conductor of the connector has a smaller size and lower strength inner conductor is more likely to cause poor contact and lead to connector failure.
Most of the inner conductors of the connector adopt elastic connection methods, such as spring claw elastic connection, slotted elastic connection of socket, and bellows elastic connection. Among them, the jack slotted elastic connection structure is simple, the processing cost is low, the assembly is relatively convenient, and the application range is the most extensive.
1. The inner conductor is not firmly fixed
For assembly needs, the structure of many radio frequency coaxial connectors is that the inner conductor is divided into two sections at the dielectric support, and then screwed together. However, due to the small diameter of the inner conductor, the strength of the inner conductor connection is very poor if the screw connection is not glued to fix it during assembly, especially for some small radio frequency coaxial connectors. Therefore, when the connector is connected and disconnected many times, under the long-term action of torsion and tension, the thread of the inner conductor may loosen and fall off, resulting in connection failure.
One of the commonly used structures of radio frequency coaxial connectors is that the inner conductor, the dielectric support, and the outer conductor are fixed together by adhesive. In this structure, if the amount of glue applied during assembly is insufficient or the connection strength of the glue is insufficient, then during use, the glued place may break due to the force, which will cause the inner conductor to rotate or move axially, and the inner conductor A good electrical contact cannot be formed and the connection fails.
Improvement method: When assembling the coaxial connector, apply an appropriate amount of conductive glue or thread locking agent to the threaded connection to increase the reliability of the threaded connection. Adhesives with higher bonding strength should be selected, and the glue must be filled with the entire glue hole when applying the glue; knurled at the inner conductor glue to increase the contact area between the inner conductor and the adhesive to prevent the inner conductor from rotating; adjust the inner conductor appropriately The radial dimensions and tolerances of the conductor, the outer conductor, and the dielectric support make the fit between the inner conductor and the dielectric support, and the dielectric support and the outer conductor an interference fit, and also make the three assembly together more firmly.
2. The size of the socket or pin of the inner conductor is incorrect
If the hole diameter of the conductor in the jack is smaller than the specified size, then when the pin of the conductor in the pin enters the jack, the jack will be excessively expanded, and the deformation will exceed its elastic deformation range, resulting in plastic deformation, resulting in damage to the conductor in the jack; On the contrary, if the diameter of the pin is too small, when the pin is matched with the socket, the gap between the pin and the wall of the socket is too large, the two inner conductors of the connector cannot be in close contact, and the contact resistance becomes larger. Electrical performance indicators will also be poor.
Improvement method: Whether the matching of the jack and the pin is reasonable, we can use the insertion force and holding force of the standard gauge pin and the conductor in the jack to measure. For N-type connectors, the insertion force when the diameter Φ1.6760+0.005 standard gauge pin matches the socket should be ≤9N, and the retention force when the diameter Φ1.6000-0.005 standard gauge pin matches the conductor in the socket ≥0.56N. Therefore, we can use the insertion force and retention force as a test standard. By adjusting the size and tolerance of the jack and the pin, and the aging treatment process of the conductor in the jack, the insertion force and the retention force between the pin and the jack can be adjusted. In a suitable range.
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