| 摘要 |
A tuning coil assembly includes an adjustable coil wound on a bobbin around which is placed a plastic coil support sleeve. The sleeve provides protection for the coil and aids in adjustment of a tuning slug inside the coil by an automatic alignment fixture. The plastic coil support sleeve is coated with a thin metallic layer or alternately impregnated with metallic particles to provide electromagnetic radiation shielding for the coil. The combination of the sleeve for both coil adjustment and electrical shielding permits placement of the coil assembly on a smaller area of a circuit board than would be possible with a separate metal shield can.
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