T-Shaped RF Switch Circuit for Branch Isolation
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Solution Overview
Problem
Modern wireless communication devices integrating multiple wireless communication services face challenges in maintaining isolation between radio frequency switch branches due to the shortening distance between branches, leading to deterioration in isolation performance.
Innovation Solution
A switch circuit design featuring a T-shaped structure with each switch branch comprising a first, second, and third switch, where the target switch branch transmits a first radio frequency signal while other branches transmit a second radio frequency signal, generated through electromagnetic induction, by controlling the opening and closing of switches based on the received radio frequency signal, thereby enhancing isolation between branches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wireless communication services are integrated in a single device, then the functionality and versatility of the device are improved, but the isolation between radio frequency switch branches deteriorates due to shortening distance between branches
Solution Approach 1:
A T-shaped isolation structure comprising first, second, and third switches is introduced as an intermediary element between radio frequency switch branches. The second switch, positioned at the branch end, acts as a mediator to block electromagnetic interference signals from propagating between adjacent branches, thereby maintaining signal isolation despite the shortened distance between branches caused by device integration.
Solution Approach 2:
The radio frequency switch circuit is segmented into multiple independent branches, each equipped with its own T-shaped isolation structure. This segmentation allows each branch to operate independently with dedicated switching elements (first, second, and third switches), preventing interference from one branch affecting another, thus enabling multiple wireless communication services to coexist without mutual interference.
2Volume of moving object
If the distance between radio frequency switch branches is shortened to improve device integration, then the compactness and miniaturization are improved, but the isolation performance between branches deteriorates
Solution Approach 1:
The T-shaped isolation structure with the second switch serves as an intermediary barrier that physically and electrically separates adjacent radio frequency switch branches. This mediator structure prevents the direct coupling of electromagnetic fields between closely spaced branches, thereby maintaining high isolation performance even when the overall device size is reduced and branches are positioned closer together.
Solution Approach 2:
The isolation structure is applied locally at critical positions within the radio frequency switch circuit, specifically at the branch ends where interference is most likely to occur. The second switch is strategically positioned at the branch end to provide localized interference blocking, while the first and third switches are positioned to control signal flow. This localized approach effectively reduces interference voltage between branches without requiring a complete redesign of the entire circuit layout.
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
The solution effectively improves the isolation between radio frequency switch branches by reducing the second radio frequency signal in non-target branches, leading to better isolation and reduced interference voltage, thus enhancing the overall performance of radio frequency switches in wireless communication devices.
Implementation Method 1
other switch branches are configured to, when the target switch branch transmits the first radio frequency signal, and the first switches and the third switches corresponding to the other switch branches are opened and the second switches corresponding to the other switch branches are closed, transmit a second radio frequency signal
Data Source
AI summary
A switch circuit includes an antenna port and at least one switch branch. Each branch includes a first, a second, and a third switches. The antenna port has one end connected with an antenna, and another end electrically connected with one end of the first switch of each branch respectively. The other end of the first switch of each branch is electrically connected with one end of the second switch corresponding to each branch and one end of the third switch corresponding to each branch respectively; the other end of each of the second switch corresponding to each branch is connected with a ground terminal; the other end of each of the third switch corresponding to each branch is electrically connected with one end of a load corresponding to each branch; and the other end of the load corresponding to each branch is connected with the ground terminal.