Deep Drawn Resonator Shell Grounding via Integral Washer
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Solution Overview
Problem
In cavity filters, the grounding of a deep drawn resonator to the filter body is unstable over extreme temperature excursions, leading to frequency drift, particularly in small-sized deep drawn resonators where space constraints hinder the addition of grounding pads or limiter stops.
Innovation Solution
A method and apparatus involving a base with a hole, a fastener, and a washer system that securely attaches a deep drawn resonator shell, using a non-linear connecting section and a washer that contacts the base only at a curved recess, providing a stable grounding contact without deforming the shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grounding pad or limiter stop is added to the resonator, then grounding stability is improved, but device complexity increases and space requirements are not met
Solution Approach 1:
The patent combines the grounding function with the resonator shell itself by forming an integrally formed shell where the shell body acts as the grounding element. This eliminates the need for separate grounding pads or limiter stops, achieving stable grounding while maintaining structural simplicity and compact size.
Solution Approach 2:
The resonator shell serves multiple functions: it contains the resonant structure, provides mechanical support, and acts as the grounding element. The integrally formed design allows the shell to simultaneously fulfill structural and electrical grounding roles, eliminating the need for additional dedicated grounding components.
2Volume of moving object
If the resonator size is reduced, then space efficiency is improved, but grounding stability deteriorates due to insufficient space for grounding features
Solution Approach 1:
The grounding function is merged into the resonator shell structure itself through integral forming. The shell body directly provides the grounding path to the filter body, eliminating the need for separate grounding features that would require additional space. This allows small-sized resonators to maintain stable grounding.
3Reliability
If the grounding contact point is made stable, then frequency drift is reduced, but manufacturing complexity increases
Solution Approach 1:
The grounding contact stability is achieved through integral forming of the shell, where the shell body directly contacts the filter body at a predetermined location. This single-step integral forming process creates a stable grounding contact without requiring complex assembly operations or multiple components, thus maintaining ease of manufacture.
Data Source
AI summary
The apparatus includes a base having a hole in a top surface, a fastener having a longitudinal section with the longitudinal section extending into the hole, and a shell. The shell has a connecting section connecting a first lateral surface section and a second lateral surface section. At least a portion of the first lateral surface section extends into the hole. The second lateral surface section extends away from the top surface of the base. The connecting section is disposed between the top surface of the base and a portion of the fastener. The connecting section has a first section and a second section, and the first section has a non-linear cross-section. The apparatus further includes a washer disposed between the portion of the fastener and the connecting section, and a portion of the washer engages the first section of the connecting section.