Broadside-Coupled Transformer Air Gap Bandwidth
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Solution Overview
Problem
Traditional RF transformers face limitations in bandwidth performance due to dielectric losses at higher frequencies and inefficient power transmission at lower frequencies, particularly in MHz and GHz ranges.
Innovation Solution
A broadside-coupled transformer configuration with planar conductors on a dielectric substrate, supported by posts, and integrated impedance matching sections to enhance bandwidth and power transfer efficiency across a wide frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional transmission line transformers are used at higher RF frequencies, then power transfer is achieved through dielectric medium, but dielectric losses limit bandwidth performance
Solution Approach 1:
The patent extracts the dielectric substrate from the power transfer path by using air as the coupling medium between primary and secondary conductors. The conductors are positioned in close proximity with air gaps, eliminating dielectric losses while maintaining electromagnetic coupling for power transfer.
Solution Approach 2:
Air serves as an intermediary medium between the primary and secondary conductors, replacing the traditional dielectric substrate for power transfer. This intermediary approach enables loss-free coupling while maintaining the transformer function across wide bandwidth.
2Adaptability or versatility
If traditional transmission line geometries are used, then construction is simplified, but efficient power transmission is not extended to lower MHz frequencies
Solution Approach 1:
The patent transitions from planar two-dimensional transmission line geometry to a three-dimensional configuration where conductors are positioned in close proximity with air gaps. This dimensional change enables efficient coupling at lower frequencies while maintaining broadband performance at higher frequencies.
Solution Approach 2:
The patent changes the geometric parameters by reducing the spacing between primary and secondary conductors and using air as the coupling medium. These parameter changes extend efficient power transmission to lower MHz frequencies while maintaining simplicity in construction.
3Adaptability or versatility
If ferrite core windings are used at lower RF frequencies, then impedance transformation is achieved through winding ratio, but the solution does not extend to higher GHz frequencies
Solution Approach 1:
The patent replaces the mechanical winding structure with a planar conductor configuration using electromagnetic coupling. This substitution eliminates the need for ferrite cores and complex winding arrangements, enabling operation from MHz to GHz frequencies with a single unified structure.
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 extends bandwidth performance from 2 GHz to 18 GHz and up to 40 GHz, reducing dielectric losses and improving power transmission efficiency, as demonstrated by scattering parameter graphs showing low return loss and minimal signal reflection.
Implementation Method 1
Support posts for supporting the second planar conductor over the first planar conductor each have a bottom attached to the dielectric substrate without contacting the first planar conductor and a top attached to a surface of the second planar conductor
Implementation Method 2
The fourth end is electrically coupled to the first end of the first planar conductor to realize a Ruthroff transformer configuration
Data Source
AI summary
A broadside-coupled transformer is disclosed. The broadside-coupled transformer has a dielectric substrate with a first planar conductor disposed on the dielectric substrate. The first planar conductor includes first and second ends. A second planar conductor is positioned over and spaced apart from the first planar conductor. The second planar conductor includes third and fourth ends. The fourth end is electrically coupled to the first end of the first planar conductor to realize a Ruthroff transformer configuration. Support posts for supporting the second planar conductor over the first planar conductor each have a bottom attached to the dielectric substrate without contacting the first planar conductor and a top attached to a surface of the second planar conductor.