RF Coupler Segmented Transmission Line Design
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Solution Overview
Problem
Conventional RF couplers incur significant losses due to mutual inductance and capacitance between transmission lines, leading to increased insertion and coupling losses, dielectric losses, and conductor losses, which affect the efficiency of RF communication systems.
Innovation Solution
The RF coupler design divides the through line into two portions, with a coupled line formed between these portions, enhancing magnetic field coupling and reducing the length of transmission lines required, thereby minimizing overall losses and occupying less space compared to conventional designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional RF coupler design with parallel transmission lines is used, then coupling function is achieved, but insertion losses and coupling losses increase significantly
Solution Approach 1:
The patent transitions from a planar parallel transmission line configuration to a three-dimensional configuration where the coupled line is positioned between the first and second portions of the through line in a vertical or layered dimension. This spatial reconfiguration enhances magnetic field coupling while reducing the length of transmission lines required, thereby minimizing conductor losses and dielectric losses without compromising coupling efficiency.
Solution Approach 2:
The through line is divided into two separate portions (first through line portion and second through line portion) with the coupled line positioned between them. This segmentation allows the magnetic field to be concentrated in the region between the portions, enhancing coupling efficiency while reducing the overall length of transmission lines needed, thus reducing energy losses.
2Reliability
If longer transmission lines are used to achieve desired coupling, then coupling efficiency improves, but area occupied by the coupler increases
Solution Approach 1:
By utilizing a three-dimensional configuration where the coupled line is positioned between the first and second portions of the through line, the patent achieves enhanced magnetic field coupling in a compact footprint. This vertical or layered arrangement allows for stronger coupling without increasing the planar area occupied by the coupler.
Solution Approach 2:
The patent changes the spatial arrangement parameters of the transmission lines, positioning the coupled line between the first and second portions of the through line at specific distances. This parameter optimization enables achieving desired coupling efficiency with shorter transmission line lengths, thereby reducing the area occupied by the coupler.
3Reliability
If transmission lines are placed in close proximity for coupling, then coupling efficiency improves, but mutual inductance and capacitance losses increase
Solution Approach 1:
The through line is segmented into two portions with the coupled line positioned between them, creating a concentrated magnetic field region. This segmentation allows for effective coupling while minimizing the overall length of transmission lines in close proximity, thereby reducing cumulative dielectric and conductor losses.
Solution Approach 2:
The patent optimizes the distance and spatial arrangement parameters between the first through line portion, coupled line, and second through line portion. By carefully controlling these parameters, the design achieves strong magnetic field coupling while minimizing the length of transmission lines in close proximity, thus reducing energy losses.
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 configuration increases coupling efficiency with shorter transmission lines, reduces insertion and coupling losses, and minimizes the area occupied by the RF coupler, while maintaining a desired degree of coupling, making it suitable for higher frequency operations.
Implementation Method 1
First transmission line 102 and second transmission line 104 are fabricated in close proximity of each other such that first transmission line 102 electromagnetically couples with second transmission line 104. Due to this, there exists a mutual inductance and a mutual capacitance between first transmission line 102 and second transmission line 104.
Implementation Method 2
Due to this, there exists a mutual inductance and a mutual capacitance between first transmission line 102 and second transmission line 104.
Implementation Method 3
A first end of the second transmission line is configured as a coupled port for providing a coupled RF signal... such that magnetic field produced due to the RF input signal in the first line portion and the second line portion envelops the second transmission line.
Data Source
AI summary
An RF coupler implementable as an integrated circuit includes a first transmission line having a first line portion and a second line portion. A first end of the first transmission line is coupled to an input port for receiving an RF input signal. A second end of the first transmission line is coupled to an output port for providing an RF output signal. The RF coupler further includes a second transmission line formed between the first line portion and the second line portion such that magnetic field produced due to the RF input signal in the first line portion and the second line portion envelops the second transmission line. A first end of the second transmission line is configured as a coupled port for providing a coupled RF signal, and a second end of the second transmission line is coupled to a termination element to form an isolation port.