Shunt-Switched RF Module for Resonant Coupling Suppression
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Solution Overview
Problem
Existing switch modules experience significant signal loss due to resonant coupling between active and non-active signal paths, particularly when bandpass filters are connected, leading to 'suck-out' effects.
Innovation Solution
Incorporation of shunt switches that selectively connect non-active signal paths to ground, along with optional shunt resistors and bypass switches, to maintain consistent impedance and minimize signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If shunt switches are added to connect non-active signal paths to ground, then signal loss is reduced and impedance stability is improved, but device complexity increases
Solution Approach 1:
The switch module is segmented into multiple independent signal paths, each with its own shunt switch that can be independently controlled. This allows selective grounding of non-active paths without affecting active paths, reducing signal loss while maintaining manageable complexity through modular design
Solution Approach 2:
Shunt switches act as intermediary components between non-active signal paths and ground. These intermediaries provide controlled coupling to ground only when needed, preventing harmful resonant effects while allowing the signal path to remain electrically isolated when the shunt switch is open
2Reliability
If shunt switches are used to prevent resonant coupling, then signal loss is reduced, but the switch module requires more components and control logic
Solution Approach 1:
Shunt switches are activated in advance before signal transmission begins on a given path, pre-establishing ground connections for non-active paths to prevent resonant coupling from occurring. This preliminary action ensures signal path stability without requiring complex real-time detection and response mechanisms
3Stability of the object's composition
If multiple shunt switches are added to each signal path, then impedance consistency is improved, but manufacturing cost and complexity increase
Solution Approach 1:
Shunt switches are strategically placed at specific locations within each signal path where impedance stabilization is most critical, rather than uniformly distributing them throughout. This localized approach maintains impedance consistency while reducing the total number of components required
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
Reduces signal loss by preventing resonant coupling, maintaining stable impedance, and optimizing switch module performance across various frequencies.
Implementation Method 1
one or more shunt switches coupled between at least one of the signal paths and ground and configured to be in an open state when that signal path is one of the active signal paths
Data Source
AI summary
A switch module is disclosed, the switch module comprising a first node; a plurality of second nodes; a plurality of series switches; a plurality of signal paths, each signal path defined between one of the plurality of second nodes and the first node and having one of the plurality of switches disposed therebetween, wherein one or more series switches are in a closed state at a time defining one or more active signal paths; and one or more shunt switches coupled between at least one of the signal paths and ground and configured to be in an open state when that signal path is one of the active signal paths.