High-frequency Module Shield Conductor Terminal Isolation
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Solution Overview
Problem
High-frequency modules with multilayer substrates and surface mount elements often fail to achieve sufficient isolation between terminals, leading to leakage signals and inadequate signal suppression.
Innovation Solution
Incorporating a shield conductor on the multilayer substrate, capacitively coupling the surface mount elements to the shield conductor, and adjusting the phase of the signals to ensure a phase difference greater than 90° and less than or equal to 180° between the signals passing through the terminals, effectively reducing or canceling leakage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a multilayer substrate with surface mount elements is used to form a high-frequency module, then the module structure is simplified and manufacturing is easier, but the isolation between terminals deteriorates and leakage signals cannot be sufficiently suppressed
Solution Approach 1:
A shield conductor is introduced as an intermediary element between the surface mount element and the ground. The shield conductor is positioned at a specific distance from the surface mount element to create capacitive coupling, which generates a correction signal that suppresses leakage signals and improves terminal isolation while maintaining the simplified multilayer substrate structure
Solution Approach 2:
The invention changes physical parameters including the distance between the shield conductor and surface mount element, the capacitance value of the correction capacitor, and the phase relationship between signals. By adjusting these parameters, the correction signal is optimized to achieve maximum leakage suppression while maintaining ease of manufacture
2Reliability
If correction capacitors are added to suppress leakage signals, then terminal isolation improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The shield conductor serves multiple functions: it acts as a shielding element, creates capacitive coupling for signal correction, and provides a reference ground. This multi-functionality reduces the need for additional dedicated correction components, thereby improving terminal isolation without proportionally increasing device complexity
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 terminals by reducing or preventing signals in specific frequency bands, enhancing the overall performance of high-frequency modules.
Implementation Method 1
the first mounting terminal and the second mounting terminal are capacitively coupled to the shield conductor
Implementation Method 2
a signal in at least a portion of a frequency band of the first signal is canceled by the second signal at the first mounting terminal
Data Source
AI summary
A high-frequency module includes a branching circuit element, a multilayer substrate, and a shield conductor. The branching circuit element includes transmission and receiving terminals and is disposed on a surface of the multilayer substrate. The shield conductor is disposed on the side of the surface of the multilayer substrate and covers the branching circuit element. The transmission and receiving terminals are disposed with respect to the shield conductor such that a signal in at least a portion of the frequency band of a first signal, which is transmitted from the transmission terminal, is cancelled by a second signal at the receiving terminal.