Transmission Line Coupling Element With Segmented Branches
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Solution Overview
Problem
Conventional coupling elements for transmission lines have a limited tuning range and can only simultaneously change impedance and propagation constant, restricting flexibility in electromagnetic coupling.
Innovation Solution
The coupling element employs transmission line segments with discrete components, allowing for variable capacitive and inductive coupling, enabling a wider tuning range by adjusting geometric design and using components like varactor diodes, transistors, or capacitive matrices to control capacitance and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a varactor diode is used for coupling conductors, then capacitive coupling is achieved, but the tuning range is limited
Solution Approach 1:
The coupling element is divided into multiple transmission line segments (first branch and second branch) with different characteristic impedances. Each segment can be independently designed with specific impedance values, allowing the overall coupling characteristics to be tuned by selecting appropriate segment combinations, thereby expanding the tuning range beyond what a single varactor diode can achieve.
Solution Approach 2:
The patent employs switchable transmission line segments that can be dynamically connected or disconnected based on control signals. This dynamic reconfiguration allows the coupling element to adapt its characteristics in real-time, providing a wider effective tuning range while maintaining a relatively simple base structure.
2Adaptability or versatility
If conventional coupling elements are used, then impedance and propagation constant can be changed, but both parameters must change simultaneously
Solution Approach 1:
By segmenting the coupling element into multiple transmission line branches with different characteristic impedances, the patent enables independent control of impedance and propagation constant. Each segment contributes differently to these parameters, allowing selective adjustment by activating specific segments through control signals.
Solution Approach 2:
Different transmission line segments are designed with locally optimized characteristics (different impedances, lengths, and configurations). This local differentiation allows specific segments to be activated to achieve desired impedance changes without necessarily changing propagation constant, or vice versa, providing independent parameter control.
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
This design provides a greater tuning range for transmission lines, allowing independent adjustment of impedance and propagation constant, enhancing the flexibility and tunability of electromagnetic coupling.
Implementation Method 1
Conventional coupling elements of this type are equipped with a varactor diode, for example, which connects different conductors of the transmission line to one another and thus implements a controllable capacitive coupling of the two conductors
Implementation Method 2
The use of branches embodied as a transmission line segment makes it possible to provide a capacitive coupling as well as an inductive coupling between the conductors of the transmission line
Data Source
AI summary
A coupling element is disclosed for electromagnetic coupling of at least two conductors of a transmission line, wherein the coupling element is arranged between a first conductor and a second conductor of the transmission line and has at least one discrete component. The coupling element can have at least one first branch embodied as a transmission line segment that is associated with the first conductor, and a second branch embodied as a transmission line segment that is associated with the second conductor. The at least one discrete component can thereby be provided for connecting the first branch to the second branch.