Stacked RF Filter Isolation via Bonding Wire Routing
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Solution Overview
Problem
Conventional radio frequency module designs face challenges in maintaining isolation between stacked transmission and reception filters due to miniaturization, leading to potential interference issues.
Innovation Solution
A radio frequency module design that includes a module board with stacked reception and transmission filters, where a bonding wire connects the transmission filter to a circuit component, enhancing isolation characteristics by avoiding direct paths through the reception filter and allowing flexible wiring arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If filter devices are miniaturized to reduce size, then the volume and area of the filter device are reduced, but the isolation between transmission filter and reception filter deteriorates due to closer spacing
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacked configuration, placing the transmission filter and reception filter on different layers (Z-axis dimension). This vertical stacking enables miniaturization of the overall device footprint while maintaining adequate isolation distance between filters through the layered structure, effectively resolving the contradiction between size reduction and isolation maintenance.
Solution Approach 2:
The patent introduces a ground electrode as an intermediary element positioned between the transmission filter and reception filter. This ground electrode acts as a shielding barrier that enhances isolation between the two filters, allowing them to be placed closer together in the stacked configuration while maintaining reliable signal separation and preventing interference.
2Length of stationary object
If direct wiring paths are used to connect filters to circuit components, then the wiring length is reduced, but interference between transmission and reception circuits increases
Solution Approach 1:
The patent applies different wiring strategies to different signal paths: the transmission filter uses a bonding wire connected to a circuit component, while the reception filter uses a bonding wire connected to a different circuit component. This localized differentiation in wiring configuration ensures that transmission and reception signals are routed through separate paths, minimizing interference while managing wiring length appropriately for each signal type.
Solution Approach 2:
The patent segments the wiring paths by connecting the transmission filter and reception filter to different circuit components through separate bonding wires. This segmentation of signal paths prevents coupling between transmission and reception circuits, reducing interference while allowing each filter to have its own optimized connection route.
Data Source
AI summary
A radio frequency module includes: a module board including a first principal surface; a reception filter disposed on or above the first principal surface; a transmission filter disposed on the reception filter; a switch mounted on the module board; and a bonding wire that connects the transmission filter to the switch. One end of the bonding wire is connected to the transmission filter and the other end of the bonding wire is connected to the switch.