Switching Module Segmentation for Harmonic Interference
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Solution Overview
Problem
Conventional switching modules for multiband communication signals face challenges in downsizing and simplification due to interference between different frequency bands, requiring separate switches for each band, which increases complexity and manufacturing costs, and can degrade communication characteristics, especially when harmonic emissions occur.
Innovation Solution
A switching module with a single switch IC that includes a common terminal and individual terminals connected via first and second switches, where the second switches are electrically independent and connected via a wiring board, allowing selective switching and connection of communication signals across bands, with optional filter circuits to attenuate harmonic components, and parallel connections to reduce spurious signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate switches are provided for each front end circuit to prevent interference, then communication characteristics are maintained, but device complexity and size increase
Solution Approach 1:
The switch IC is divided into two distinct groups: first switches (104, 108a, 108b) connected to the common terminal within the IC, and a second switch (109) connected via external wiring board. This segmentation allows electrical independence between switch groups, preventing harmonic interference while maintaining the simplified single-IC structure.
2Volume of moving object
If all switches are integrated within the switch IC, then device size is reduced, but harmonic interference occurs between different bands
Solution Approach 1:
The wiring board serves as an intermediary element between the second switch (109) and the common terminal. This external connection path physically separates the second switch from the other switches within the IC, preventing harmonic leakage while maintaining a compact overall structure. The wiring board acts as a mediator that enables both size reduction and interference prevention.
3Reliability
If separate switches are provided for each band, then interference is prevented, but manufacturing cost increases
Solution Approach 1:
Multiple switches (104, 108a, 108b) that would traditionally be separate components are merged into a single integrated switch IC. This consolidation reduces the number of discrete components, simplifies assembly, and lowers manufacturing costs while maintaining signal isolation through the electrical independence design.
4Volume of moving object
If switches are arranged in close proximity within a single IC, then device size is reduced, but harmonic components leak between switch portions
Solution Approach 1:
The switch IC is segmented into two electrically independent groups: first switches (104, 108a, 108b) connected to the common terminal, and a second switch (109) connected via external wiring board. This segmentation creates physical and electrical separation that prevents harmonic leakage while maintaining compact dimensions.
Data Source
AI summary
A switching module includes a common terminal, individual terminals connected to respective corresponding signal paths, and a switch portion that selectively switches and connects the common terminal to one of the individual terminals. The switch portion includes first switches and at least one second switch, each first switch being connected to the common terminal at one end portion within the switch, the at least one second switch being connected to the common terminal at one end portion via a connection wiring electrode provided on a wiring board. This does not allow directional connection between the one end portion of the second switch and the common terminal within the switch. Thus, mutual interference between a communication signal transmitted through the first switch and a communication signal transmitted through the second switch is prevented.