Figure 9. Skin-effect characteristic-impedance error as a function of frequency.

are straightened. The instruction sheet provides directions for machining the material for use with the Type 900-BT Connector, including procedures for minimizing dimensional changes. At frequencies where skin depth is negligible, the characteristic impedance of a transmission line made from this material is 50 +0.0013 ohms, or ±0.065%. The skin-depth deviation as a function of frequency is shown in Figure 9.

There is a practical limit to the length of the precision air line that can be made from this material because of inner conductor sag. An expression for the sag is given below. This expression is pessi-

Type 0900-9509

Type 0900-9508

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