How to match the phase stable cable with length ≤1m?

Factors determining the phase of phase stable cable
The electrical length is the determining factor of phase stable cable phase. To make the phase stable cable assembly of N units (N ≥ 2) have consistent phase, it is necessary to make it have consistent electrical length, insulation dielectric constant, ambient temperature and cable bending, etc. If the mechanical length of the phase stable cable is consistent under the ideal medium state and the same ambient temperature and bending conditions, it is possible to ensure consistent electrical length, but phase stable cable in the manufacturing process there is an unavoidable media inhomogeneity, this inhomogeneity is both the insulation material itself, such as impurities containing porosity, but also the cable media structure, manufacturing process and other factors. Therefore, only by ensuring consistent mechanical length can not completely guarantee the consistency of the electrical length of the period, phase stable cable length the longer this phase inconsistency month obvious, but also need to use the electrical length test means to assist processing.

Short phase stable cable phase matching
The phase stable cable assembly mentioned here mainly refers to the short phase stable cable assembly with length ≤ 1m, and the method used for phase stable cable of this type is to guarantee its electrical length directly by ensuring the mechanical length. Because the phase stable cable is short, so the influence of media unevenness is less obvious and can usually be ignored. This type of phase stable cable assembly on the precise requirements of the length of the drop chat is relatively high, the specific requirements to what extent to use the frequency and the required phase width.

At present, the domestic manufacture of ordinary falling machine may not reach the usual accuracy requirements, and the quality of the cut is not good. The general practice is: design a tooling with a line slot, the width of the line slot for the upper tolerance of the diameter of the line slot, drop just enough to phase stable cable stuck into the line slot, phase stable cable fixed with clamps at both ends, and then use the spacer to drop the material, drop shall ensure that the gap as flush as possible, you can consider laser cutting line or saw blade to achieve, if the process can be installed first If the process can first install one end of the connector in the other end of the phase stable cable for cutting will be more accurate phase.

The fixture can effectively avoid the mechanical length measurement error caused by the natural bending of the phase stable cable, easy to operate, and the mechanical length consistency among the phase stable cables is high, which ensures the consistent electrical length among the phase stable cables. In addition, the drop tooling can also be made of metal pipe parts, phase stable cable into the tube after the drop, the same effect as the wire channel method, but the tooling processing is relatively more difficult. This kind of method is an efficient and convenient way to match the phase of short phase stable cable assembly, but it is obviously not suitable for the phase of long phase stable cable. For semi-steel or semi-flexible phase stable cable of such uniform solid insulation is more suitable. ZOMWAVE provide phase stable cable with high performance and low price, click blue words and learn more.