Stepped Package Structure for Cavity Resonance Suppression
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Solution Overview
Problem
Existing packages for broadband devices suffer from cavity resonance due to incomplete coverage of radio wave absorbers, which compromises airtightness and stability, leading to weakened radio wave absorption and unstable device operation.
Innovation Solution
A package design with a stepped engaging section at the container opening edge allows a radio wave absorber to cover the entire inner cavity surface, ensuring airtightness and complete suppression of cavity resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio wave absorber is joined to the inner wall of the bottomed container with a certain clearance to ensure airtightness, then the airtightness of the package inner cavity is secured, but the entire upper surface of the package inner cavity cannot be covered with the radio wave absorber, weakening the radio wave absorption effect
Solution Approach 1:
The radio wave absorber is extended from the inner wall surface into the cavity space by forming a protrusion that projects toward the lid. This dimensional extension allows the absorber to cover the entire upper surface area of the cavity while maintaining clearance from the lid for airtightness, effectively resolving the contradiction between complete surface coverage and maintaining airtight seal.
Solution Approach 2:
The protrusion structure of the radio wave absorber is pre-formed to extend toward the lid before final assembly. This preliminary configuration ensures that when the lid is sealed to the container, the absorber already occupies the necessary space to suppress cavity resonance while the clearance is maintained for airtight sealing.
2Object-affected harmful factors
If the radio wave absorber is joined close to the lid to maximize coverage, then the radio wave absorption effect is improved, but the airtightness of the package cannot be ensured
Solution Approach 1:
Instead of placing the absorber flat on the inner wall, the protrusion structure extends the absorber into the third dimension (toward the lid), maximizing surface coverage and absorption effectiveness while preserving the necessary clearance zone for airtight sealing between the container and lid.
3Object-affected harmful factors
If the radio wave absorber is made fragile to achieve desired electromagnetic properties, then the absorption performance is optimized, but the absorber may be broken during assembly or operation
Solution Approach 1:
The protrusion structure of the radio wave absorber is nested within the cavity space, extending from the inner wall toward the lid without requiring external support structures. This nested configuration provides mechanical support through the container wall while allowing the absorber material to maintain its optimized electromagnetic properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively covers the entire inner cavity with the radio wave absorber, maintaining airtightness and preventing cavity resonance, thereby stabilizing device operation and reducing manufacturing costs.
Implementation Method 1
the radio wave absorber 307 absorbs unnecessary electromagnetic waves to suppress cavity resonance
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The package includes a container (101), an engaging section (103), a dielectric substrate (105), an input/output IF (106), a radio wave absorber (107) and a lid (108). The container (101) includes an engaging section (103) formed by a step extending to an outer peripheral side and formed at an opening edge (102), and the radio wave absorber (107) is engaged to the engaging section (103) to cover a whole region of a bottom surface (104) of the container (101).