RF Switch Parallel Branch Module Isolation Control
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Solution Overview
Problem
Radio frequency switches experience reduced isolation due to coupling effects, leading to inefficiencies in signal transmission and increased costs from larger, more complex front-end modules.
Innovation Solution
A radio frequency switch design with multiple signal transmission modules, each comprising a common port, first and second series branch modules, and a parallel branch module, where the parallel branch module is strategically positioned between the ground port and the first end, allowing for independent control of conductive and nonconductive states to manage isolation effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional radio frequency switch design is used, then signal transmission can be achieved, but isolation is reduced due to coupling effects
Solution Approach 1:
The patent introduces a parallel branch module as an intermediary element connected between the common port and ground. This parallel branch acts as a mediator that provides an alternative current path, thereby reducing the coupling effect between series branches and improving isolation between different signal paths. The parallel branch module effectively decouples the harmful interaction between adjacent signal transmission paths.
Solution Approach 2:
The radio frequency switch is segmented into multiple independent signal transmission modules, where each module contains its own series branch modules and parallel branch module. This segmentation isolates the coupling effects within individual modules rather than allowing them to propagate across the entire switch structure, thereby improving overall isolation performance while maintaining signal transmission capability.
2Reliability
If larger front-end modules are used to improve isolation, then isolation performance can be enhanced, but device complexity and cost increase
Solution Approach 1:
The parallel branch module serves multiple functions simultaneously: it provides a ground reference, reduces coupling effects, improves isolation between signal paths, and maintains impedance matching. By consolidating these multiple functions into a single structural element, the patent avoids the need for additional separate components that would increase device complexity and cost.
Solution Approach 2:
The patent merges the isolation improvement function with the existing signal transmission structure by integrating the parallel branch module directly into each signal transmission module. This merging approach eliminates the need for separate isolation enhancement components, thereby maintaining simplicity while achieving improved isolation performance.
Data Source
AI summary
A radio-frequency switch includes: at least two signal transmission modules, each signal transmission module includes a common port, a first series branch module, a second series branch module and a branch port; a parallel branch module; and a ground port. The parallel branch module is disposed between the ground port and a first terminal, and the first terminal is disposed between the first series branch module and the second series branch module. The common port is further connected with common ports of the other signal transmission modules in the radio-frequency switch, and the branch port is further connected with branch ports of the other signal transmission modules in the radio-frequency switch. State switching of the radio-frequency switch is realized by changing states of the first series branch module, the second series branch module and the parallel branch module.