Switching Network Bypass Paths for RF Filter Insertion Loss
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Solution Overview
Problem
Current RF systems incur significant loss when bypassing filters or diplexers, as existing architectures require additional series switch elements that contribute to switch insertion loss.
Innovation Solution
A switching network with a first switch having an input pole and dedicated bypass throws, and a second switch configured between the RF component's output and bypass conduction path, allowing for reduced insertion loss by minimizing the number of switches engaged during bypass mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional series switch elements are used to bypass the filter or diplexer, then the bypass path is established, but switch insertion loss increases
Solution Approach 1:
The patent segments the bypass path into two separate switching stages: a first switch at the input that routes the RF signal to either the filter/diplexer or the bypass path, and a second switch at the output that connects the bypass path to the output. This segmentation allows the RF signal to pass through fewer active switch elements when in bypass mode, reducing overall insertion loss while maintaining the ability to establish a bypass path when needed.
Solution Approach 2:
The patent introduces an intermediary bypass path that is dedicated solely for bypassing the filter or diplexer. This intermediate conduction path is designed with minimal switching elements and optimal impedance matching to reduce loss. The bypass path acts as a mediator that allows the RF signal to circumvent the filter/diplexer when bypass mode is activated, thereby reducing switch insertion loss while maintaining bypass adaptability.
2Reliability
If more switches are engaged in bypass mode, then better signal routing control is achieved, but insertion loss increases
Solution Approach 1:
The patent divides the signal routing control into two independent switching stages: input switching that determines whether to route the signal through the filter/diplexer or bypass path, and output switching that determines whether to connect the bypass path or filter/diplexer output to the final output. This segmentation provides reliable signal routing control while minimizing the number of switches the signal must pass through in bypass mode, thereby reducing insertion loss.
Solution Approach 2:
Instead of using a single switch with multiple throws that would require the signal to pass through the switch multiple times for different routing options, the patent inverts the approach by using two separate switches positioned at different locations in the signal path. This inversion allows the bypass signal to pass through fewer switch elements, reducing insertion loss while maintaining reliable routing control through the coordinated operation of both switches.
Data Source
AI summary
Disclosed are systems, circuits and methods related to low-loss bypass of a radio-frequency (RF) filter or diplexer. In some embodiments, a switching network circuitry can include a first switch that has an input pole configured to receive a radio-frequency (RF) signal, a pass-through throw configured to be connectable to the input pole to allow routing of the RF signal to an RF component, and at least one dedicated bypass throw configured to be connectable to the input pole and at least one bypass conduction path. The switching network circuitry can further include a second switch that has a pole and a throw, and is connectable between an output of the RF component and the bypass conduction path. Use of the dedicated bypass throw(s) in the first switch allows implementation of low-loss bypass of the filter or diplexer.