RF Blanking Switch With Coupling Layer to Prevent RF Spikes
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Solution Overview
Problem
Active components in transmission lines cause electromagnetic mode and impedance changes, leading to RF spikes and requiring multiple DC voltages, which complicates signal transmission and affects efficiency.
Innovation Solution
A radiofrequency blanking switch system with a control line, diodes, and an inductor, coupled via vias to a transmission line without physical contact, inducing an electromagnetic response to selectively filter frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If active components are added in series to blank or attenuate signals, then signal filtering capability is improved, but electromagnetic mode and impedance changes occur causing RF spikes
Solution Approach 1:
The patent introduces a coupling layer as an intermediary between the active components (diodes, inductor, resistor) and the transmission line. This coupling layer enables electromagnetic coupling without direct physical contact, allowing signal filtering while avoiding the harmful RF spikes that occur when active components are directly connected in series to the transmission line.
2Adaptability or versatility
If active components are used for signal blanking, then frequency selective filtering is achieved, but three DC voltages (positive, negative, and ground) are required increasing system complexity
Solution Approach 1:
The patent extracts the harmful requirement for multiple DC voltages by using a different configuration where the active components are coupled to the transmission line through a coupling layer rather than being directly connected. This extraction allows frequency selective filtering to be achieved while reducing the DC voltage requirements from three voltages (positive, negative, and ground) to a simpler configuration.
3Ease of operation
If active components are directly connected to transmission line, then signal control is improved, but physical contact affects signal amplitude and phase
Solution Approach 1:
The coupling layer serves as an intermediary that enables signal control through electromagnetic coupling without direct physical contact between active components and the transmission line. This maintains signal amplitude and phase accuracy while still allowing effective signal control through the controlled coupling mechanism.
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 system effectively cancels targeted frequency bands without affecting DC current or other frequencies, ensuring smooth switching and reduced complexity with a single DC voltage.
Implementation Method 1
the coupling layer is not physically connected to the transmission line and is close enough to the transmission line for each of the plurality of diodes to induce an electromagnetic response in the transmission line
Data Source
AI summary
A radiofrequency blanking switch system and/or apparatus, comprising: a control line further comprising a resistor, a plurality of diodes each further comprising two vias, and an inductor electrically connected in series; and a coupling layer electrically connected to each of the vias and broadside coupled to a transmission line, wherein the coupling layer is not physically connected to the transmission line and is adjacent to the transmission line for each of the plurality of diodes to induce an electromagnetic response in the transmission line.