Press Pad With Lateral Protrusions For RF Module Bonding
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Solution Overview
Problem
The challenge in bonding substrates into high aspect ratio channels of RF/IF modules arises due to the difficulty in applying uniform pressure, as conventional press pads tend to misalign and cause pressure gradients, leading to non-uniform bonding and weakened bond strength.
Innovation Solution
The use of press pads with protrusions on opposing edges, which are designed to fit within the channel without contacting the sidewalls, minimizing lateral movement and ensuring alignment, thereby maintaining uniform pressure across the substrates during bonding with adhesive films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the press pad width is narrowed to fit within the channel without contacting sidewalls, then pressure loss from friction is avoided, but the press pad becomes more flexible and misaligns with the substrate causing pressure gradients
Solution Approach 1:
The press pad is segmented into a body portion and protrusion portions. The protrusions act as separate alignment elements that engage with the channel walls to prevent lateral movement, while the body portion maintains uniform pressure on the substrate without contacting the channel sidewalls.
Solution Approach 2:
The protrusions serve as intermediary elements between the press pad and the channel walls. They provide the necessary lateral constraint to prevent misalignment without requiring the main body of the press pad to contact the sidewalls, thus avoiding friction-induced pressure loss.
2Manufacturing precision
If protrusions are added to the press pad to prevent lateral movement, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The press pad is segmented into a body portion and protrusion portions. The protrusions act as separate alignment elements that engage with the channel walls to prevent lateral movement, while the body portion maintains uniform pressure on the substrate without contacting the channel sidewalls.
Solution Approach 2:
The protrusions provide localized structural features at specific positions (opposing edges) of the press pad to achieve alignment, while the rest of the press pad body maintains simple geometry for uniform pressure distribution. This localized complexity only where needed minimizes overall device complexity.
3Ease of operation
If the press pad is made taller to exceed channel depth for easy placement, then ease of operation is improved, but the press pad may contact sidewalls causing friction and pressure loss
Solution Approach 1:
The press pad is segmented into a body portion and protrusion portions. The protrusions extend beyond the channel depth to facilitate easy placement and removal, while the body portion remains within the channel to avoid sidewall contact and maintain uniform pressure distribution.
Solution Approach 2:
The protrusions provide localized structural features at specific positions (opposing edges) of the press pad to achieve alignment, while the rest of the press pad body maintains simple geometry for uniform pressure distribution. This localized complexity only where needed minimizes overall device complexity.
Data Source
AI summary
A press pad for bonding substrates into a radio-frequency and/or intermediate-frequency module. The module has a plurality of channels, each of which has an adhesive film for bonding the substrate. The press pad has a pad body conformal to the substrate and pairs of lateral protrusions extending from central axes of opposing surfaces of the pad body. The protrusions are in the forms of semicircular bumps or fins extending perpendicular to the opposing surfaces. Therefore, the lateral extent of the press pad within the channel is minimized, such that the misalignment and inclination of the press pad is minimized. Further, the lateral protrusions are fabricated from material operative to resist lateral pressure, such that deformation of the press pad caused by lateral pressure is also prevented. Therefore, pressure gradient and pressure loss are prevented.