Phase-Shifting Circuit With Transformer Unit For Impedance Matching
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Solution Overview
Problem
Conventional phase-shifting circuits require a large size to achieve significant phase shifting and often compromise on VSWR characteristics across a wide frequency band, with complex dielectric body adjustments needed for impedance matching, leading to decreased linearity and increased control complexity.
Innovation Solution
A phase-shifting circuit with a signal conductor and a dielectric body that changes the overlapping area to shift signal phases, incorporating transformer units with high-impedance and low-impedance sections for impedance matching between overlapping and non-overlapping sections, allowing for increased phase shifting while minimizing size and achieving excellent VSWR across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of intersections is increased to increase phase shifting amount, then the phase shifting amount is improved, but the full length of the circuit becomes large
Solution Approach 1:
The patent transitions from a one-dimensional arrangement with multiple intersections along the longitudinal direction to a two-dimensional overlapping structure where the dielectric body overlaps with the signal conductor. This dimensional change allows achieving the required phase shifting amount within a compact longitudinal length by utilizing the overlapping area as the controlling parameter instead of the number of intersections.
Solution Approach 2:
The patent changes the controlling parameter from the number of intersections to the overlapping area between the dielectric body and signal conductor. By adjusting the overlapping area through dielectric body movement, the phase shifting amount is controlled without increasing the circuit length, resolving the contradiction between phase shifting capability and circuit compactness.
2Reliability
If the shape of dielectric body and interval between intersections are adjusted to achieve excellent VSWR characteristic in wide frequency band, then the VSWR characteristic is improved, but the linearity between driving amount and phase shifting amount decreases and control complexity increases
Solution Approach 1:
The patent simplifies the control parameter from multiple geometric adjustments (dielectric body shape, intersection intervals) to a single parameter: overlapping area. This single parameter control maintains excellent VSWR characteristics across wide frequency bands while preserving linearity between driving amount and phase shifting amount, significantly reducing control complexity.
Solution Approach 2:
The patent introduces transformer units that divide the circuit into high-impedance and low-impedance sections. This segmentation approach achieves impedance matching and maintains excellent VSWR characteristics without requiring complex adjustments to the dielectric body shape or intersection intervals, thereby preserving control linearity and simplicity.
3Quantity of substance
If the overlapping area is changed by moving dielectric body to shift phase, then the phase shifting is achieved, but impedance mismatch occurs between overlapping and non-overlapping sections
Solution Approach 1:
The transformer unit acts as an intermediary between the overlapping section and non-overlapping section. It provides impedance matching by transitioning from high-impedance to low-impedance sections, enabling smooth impedance transition and maintaining excellent VSWR characteristics while the dielectric body moves to change the overlapping area for phase shifting.
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 enables increased phase shifting with reduced size and maintains excellent VSWR characteristics across a wide frequency band, while ensuring high linearity between the driving amount and phase shifting, and simplifying the control of the dielectric body movement.
Implementation Method 1
a dielectric body disposed to overlap with the signal conductor, to change a phase of the signal by changing an area of an overlapping section in which the signal conductor overlaps with the dielectric body
Implementation Method 2
a transformer unit provided on an input side end and an output side end for the signal of the dielectric body, for impedance matching between the overlapping section and a non-overlapping section, the transformer unit comprising a high-impedance section provided on an overlapping section side and a low-impedance section provided on a non-overlapping section side
Data Source
AI summary
A phase-shifting circuit 1 includes a signal conductor 2 that transmits signals, and a dielectric body 3 that is disposed to overlap the signal conductor 2, said phase-shifting circuit changing the phase of the signals by changing the area of an overlapping section 5 where the signal conductor 2 and the dielectric body 3 overlap each other. The phase-shifting circuit further includes a transformer unit 7 for matching impedance between the overlapping section 5 and non-overlapping section 6 where the signal conductor 2 and the dielectric body 3 do not overlap each other, said transformer unit being provided at end sections of the dielectric body 3, said end sections being on the input side and output side of the signals. The transformer unit 7 includes a high-impedance section 7a that is provided on the overlapping section 5 side, and a low-impedance section 7b, which is provided on the non-overlapping section 6 side of the high-impedance section 7a, and which has a lower characteristic impedance than the high-impedance section 7a.