Coaxial Filter Arrangement Using Spring Inductance and Compressed Dielectric

The patent changes the physical state and mechanical properties of the dielectric element by replacing thin rigid films with compressible foam material. This allows the dielectric to be compressed by spring force to achieve the required capacitance value without requiring tight mechanical tolerances during assembly. The foam material's compressibility provides a mechanism to achieve high capacitance while maintaining ease of manufacture.

The patent introduces a spring as an intermediary element between the inner and outer conductors. This spring applies compressive force to the foam dielectric, enabling the dielectric to be compressed to the optimal density for achieving high capacitance. The spring acts as a mediator that transforms the mechanical assembly process into a simple insertion operation, eliminating the need for precise tolerance control.

The patent combines multiple functions into integrated components. The foam dielectric serves simultaneously as the capacitive element and the mechanical spacer, eliminating the need for separate capacitor components. The spring serves as both the inductive element and the compressive force generator, replacing traditional large inductor components. This merging of functions reduces overall device complexity while maintaining filter performance.

The patent changes the physical parameters of the components by using compressed foam material with variable density. By controlling the compression ratio and foam density, the capacitance value can be adjusted without increasing physical size. Similarly, the spring's wire diameter and turn density can be optimized to achieve the required inductance in a compact form factor.

The patent incorporates the foam dielectric's compressibility as a built-in cushioning mechanism. During assembly, the spring compresses the foam to the precise density needed for accurate capacitance, automatically compensating for variations in initial foam dimensions. This self-adjusting mechanism ensures capacitance accuracy without requiring tight tolerances on the foam's initial dimensions, significantly reducing production costs.

The system uses the spring's compressive force to automatically adjust the foam dielectric to the optimal compression state. The foam's own compressibility serves the dual purpose of achieving the required capacitance value and accommodating manufacturing variations. This self-adjusting mechanism eliminates the need for expensive precision machining or inspection processes.