Abstract: 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.

Abstract: A wire coil assembly including a form for supporting a wire wound thereon, a base for the wire form, and terminals attached to the base and to which the ends of the wire are respectively connected. The base includes a number of exposed grooves through which the wire ends are routed from the wire form to the terminals. The grooves are configured to contain the wire ends, thereby eliminating exposed wire ends which would otherwise be susceptible of stress breakage when the coil assembly is handled.