High-Frequency Module Lead Electrode Isolation via Opposite Direction Routing
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Solution Overview
Problem
In high-frequency modules, the small size of switch ICs leads to short intervals between terminal lands, resulting in deteriorated isolation between lead electrodes due to magnetic field coupling, especially in small-sized modules where the lead electrode formation pitch is small.
Innovation Solution
The lead electrodes connected to adjacent lands are arranged at the same interval but in opposite directions, and those at both ends extend parallel to the land arrangement direction, reducing the number of parallel lead electrodes and improving isolation by staggering the lands on first and second axes and disposing lead electrodes at different layers, which prevents coupling between frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of switch IC is reduced to achieve small-sized high-frequency modules, then the module size is reduced, but the isolation between lead electrodes deteriorates due to shorter intervals between lands
Solution Approach 1:
The patent applies dimensionality change by arranging lead electrodes not only in the planar direction but also extending them in opposite directions perpendicular to the land arrangement direction. This creates spatial separation in multiple dimensions, effectively increasing the isolation distance between adjacent lead electrodes while maintaining the compact module size. The lead electrodes connected to adjacent lands are configured to extend in opposite directions, utilizing the third dimension (depth/height) to achieve better isolation.
Solution Approach 2:
The patent employs asymmetry in the arrangement of lead electrodes by making those at both ends extend parallel to the land arrangement direction while those in the middle extend in opposite directions perpendicular to it. This asymmetric configuration optimizes the isolation characteristics for different positions within the module, preventing magnetic field coupling between adjacent lead electrodes while maintaining compact dimensions.
2Quantity of substance
If the interval between lands is reduced to accommodate more terminals in small-sized modules, then the terminal density increases, but the magnetic field coupling between adjacent lead electrodes increases
Solution Approach 1:
By extending lead electrodes in opposite directions perpendicular to the land arrangement direction, the patent utilizes spatial separation in the vertical dimension to reduce magnetic field coupling between adjacent lead electrodes. This allows for reduced land intervals while maintaining adequate isolation, thereby increasing terminal density without suffering from harmful magnetic field coupling effects.
Solution Approach 2:
The patent introduces ground electrodes as intermediary elements between adjacent signal lead electrodes. These ground electrodes act as electromagnetic shields, intercepting and redirecting magnetic field lines, thereby reducing the coupling between adjacent signal-carrying lead electrodes even when they are closely spaced.
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
This configuration significantly improves the isolation between lead electrodes, preventing signal leakage and malfunctions in switching operations, thus enhancing the switching and transmission characteristics of the high-frequency module.
Implementation Method 1
When a signal is transmitted through one of the lead electrodes, a magnetic field is generated around the lead electrode and is coupled to another one of the lead electrodes adjacent to the lead electrode.
Data Source
AI summary
A high frequency module includes RF terminal lands at a first layer that is a surface layer of a multilayer substrate on which RF terminal electrodes of a switch IC are mounted that are arranged in a line. Each of the RF terminal lands is electrically connected to one end of a lead electrode at a second layer via a via hole. Some of the lead electrodes extend from corresponding ones of the RF terminal lands in an outward direction away from a side of the switch IC. The remaining ones of the lead electrodes extend from corresponding ones of the RF terminal lands in an inward direction that is opposite to the outward direction.