RF Module Recessed Filter Layout for Lower Package Height
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio frequency modules, such as those described in Patent Document 1, face challenges in reducing their height due to the filter being in contact with a metal film, which limits further miniaturization.
Innovation Solution
The radio frequency module incorporates a mounting substrate with a filter mounted on one main surface and a conductive member covering the opposite surface of the filter, with the filter positioned within a recess, and a resin layer covering the filter's outer peripheral surface, allowing for reduced module height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the filter is mounted on the mounting substrate with contact to the metal film, then the filter is securely fixed and electrically connected, but the height of the radio frequency module cannot be reduced further
Solution Approach 1:
The filter is positioned inside a recess formed in the mounting substrate, allowing the filter to be nested within the substrate thickness rather than extending outward. This nesting approach reduces the overall height of the radio frequency module while maintaining secure mechanical support and electrical connection through the conductive member that contacts both the filter and the substrate's ground layer.
Solution Approach 2:
The design transitions from a planar mounting approach to a three-dimensional structure by forming a recess in the substrate. This dimensional change allows the filter to be positioned below the top surface of the substrate, effectively reducing the module's height in the vertical dimension while maintaining all necessary electrical connections through the conductive member.
2Length of stationary object
If the filter is positioned inside a recess, then the module height is reduced, but the manufacturing complexity increases
Solution Approach 1:
The recess is formed in the mounting substrate before the filter is mounted. This preliminary action allows the filter to be precisely positioned within the recess during assembly, ensuring proper alignment and contact with the conductive member. The pre-formed recess acts as a guide and constraint, simplifying the actual mounting process and reducing positioning errors.
Solution Approach 2:
The conductive member serves as an intermediary element that bridges the filter and the mounting substrate. It makes contact with both the filter's bottom surface and the substrate's ground layer, providing both mechanical support and electrical connection. This intermediary simplifies the overall structure by consolidating multiple functions into a single component.
Data Source
AI summary
A radio frequency module is reduced in height. A radio frequency module includes a mounting substrate, a filter, and a conductive member. The mounting substrate has a first main surface and a second main surface opposite to each other. The filter is mounted on the first main surface of the mounting substrate. The conductive member covers at least part of a main surface of the filter on a side opposite to the mounting substrate. The first main surface of the mounting substrate has a recess. The main surface of the filter is in contact with the conductive member. At least part of the filter is positioned inside the recess.