Circuit Module Ground Electrode Via Conductor Signal Isolation
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Solution Overview
Problem
In mobile communication terminals, the size reduction of circuit modules leads to increased risk of signal interference between transmission and reception signals due to the proximity of signal electrodes, with the ground electrode failing to effectively isolate signals when the space between them becomes too small, causing transmission signals to leak and interfere with reception signals.
Innovation Solution
A circuit module design featuring a mounting substrate with signal electrodes, a ground electrode arranged between them, and via conductors connected to the ground electrode, where the edge of the ground electrode has a bent portion and the via conductors are positioned to superpose with the end surface of the ground electrode, enhancing signal isolation by preventing signal leakage along the edge towards other electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the space between signal electrodes is reduced to decrease module size, then the circuit module size is reduced, but signal isolation deteriorates and transmission signals leak to interfere with reception signals
Solution Approach 1:
The ground electrode edge is designed with a bent portion (curved shape) instead of a straight edge. This curvature creates a longer path for signal leakage and directs leaked signals toward via conductors, effectively preventing transmission signals from interfering with reception signals while maintaining reduced electrode spacing
Solution Approach 2:
Via conductors are positioned to overlap with the bent edge of the ground electrode, creating an intermediary structure that captures and redirects leaked signals. The via conductors act as mediators that prevent direct signal coupling between adjacent signal electrodes by providing a controlled path to ground
2Object-affected harmful factors
If a ground electrode is added between signal electrodes to improve signal isolation, then signal interference is reduced, but the device complexity and space requirements increase
Solution Approach 1:
The ground electrode is segmented into multiple sections with bent portions at strategic locations between signal electrodes. This segmentation allows the ground electrode to provide isolation functionality while maintaining a compact layout and reducing the need for additional complex shielding structures
Solution Approach 2:
The ground electrode serves multiple functions: it provides signal isolation between adjacent electrodes, acts as a reference plane for impedance control, and when combined with via conductors, creates a shield that prevents signal leakage. This multi-functionality reduces the need for separate shielding components
Data Source
AI summary
In a circuit module, even if a transmission signal output from a transmission electrode of a mounting substrate to a transmission terminal of a splitter leaks into a ground electrode, the transmission signal that has leaked into the ground electrode is mainly transmitted along an edge of the ground electrode and the transmission signal that has leaked into the ground electrode flows into a plurality of via conductors arranged with end surfaces superposed with the edge of the ground electrode when viewed in plan. Therefore, a transmission signal that has been output from the transmission electrode and leaked into the ground electrode is prevented from traveling along the edge of the ground electrode toward the reception electrode side. As a result, isolation characteristics of the transmission electrode and the reception electrode from each other are improved.