Slow-Wave Phase Shifter Layout for Low-Loss Antenna Beam Control
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Solution Overview
Problem
Existing phase shifters suffer from significant signal loss, which degrades beam quality and radiation power in antennas.
Innovation Solution
A phase shifter design incorporating a phase-shifting unit with a phase-shifter wiring, adjustable dielectric layer, and grounding electrode layer, featuring a defected ground structure and parallel stub structure to introduce equivalent inductance and capacitance, reducing the phase velocity and wavelength, thus shortening the transmission path and minimizing signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional phase shifter design is used, then the phase shift capability is achieved, but the signal loss is large which affects beam quality and radiation power
Solution Approach 1:
The patent changes the physical parameters of the transmission path by introducing defected ground structures and parallel stubs that modify the equivalent inductance and capacitance. This alters the phase velocity and wavelength of the signal, enabling phase shifting while reducing transmission path length and signal loss, thereby improving beam quality and radiation power
Solution Approach 2:
The patent introduces defected ground structures and parallel stubs as intermediary elements between the signal transmission paths. These intermediaries provide the necessary phase shifting function through their equivalent inductance and capacitance, while minimizing direct interference with the main signal path and reducing overall signal loss
2Ease of operation
If the transmission path is lengthened to achieve phase shifting, then the phase difference between antenna elements is controlled, but the signal loss increases
Solution Approach 1:
The patent modifies the electromagnetic parameters (phase velocity and wavelength) by introducing defected ground structures and parallel stubs with specific equivalent inductance and capacitance values. This allows achieving the required phase difference between antenna elements in a shorter transmission path, thereby reducing signal loss while maintaining phase control capability
Solution Approach 2:
The patent creates a dynamic equivalent circuit model where the defected ground structures and parallel stubs provide adjustable equivalent inductance and capacitance. This dynamic parameter adjustment enables precise phase control while optimizing the transmission path length to minimize signal loss
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 achieves improved beam quality and radiation power by reducing signal loss while maintaining phase shift capability, with a compact and efficient design that enhances integration and reduces manufacturing complexity.
Implementation Method 1
an adjustable dielectric layer, and a grounding electrode layer, the phase-shifter wiring and the grounding electrode layer are disposed opposite to each other, and the adjustable dielectric layer is located between the phase-shifter wiring and the grounding electrode layer
Implementation Method 2
featuring a defected ground structure and parallel stub structure to introduce equivalent inductance and capacitance
Implementation Method 3
featuring a defected ground structure and parallel stub structure to introduce equivalent inductance and capacitance
Data Source
AI summary
Provided are phase shifter and antenna. Phase-shifter wiring of phase shifter includes transmission unit which includes first wiring segment and second wiring segment connected to each other. First via-hole is disposed on grounding electrode layer. In direction perpendicular to plane of grounding electrode layer, first via-hole covers first wiring segment, and grounding electrode layer covers second wiring segment. Along first direction perpendicular to extension direction of phase-shifter wiring, length of second wiring segment is greater than length of first wiring segment. In phase shifter and antenna, equivalent inductance and equivalent capacitance are introduced on phase-shifter wiring through defected ground structure and parallel stub structure to realize slow-wave effect, so that length of phase-shifter wiring can be significantly shortened, thereby reducing length of transmission path of radio frequency signal on phase-shifter wiring, decreasing loss of radio frequency signal on phase-shifter wiring, and improving beam quality and radiation power of antenna.