Patch Antenna With Offset Power Supply for Circular Polarization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional patch antenna devices face challenges in achieving high gain and circular polarization characteristics with a simple structure, particularly in adjusting resonance frequencies and axial ratios for circularly polarized signals.
Innovation Solution
A patch antenna device with a rectangular dielectric plate and planar emission electrode, featuring symmetrically arranged slits on the short sides and a power supply position offset from the center, which adjusts the phase difference between resonance frequencies to achieve circular polarization characteristics with high gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the planar emission electrode is adjusted to achieve circular polarization characteristics, then the axial ratio corresponds to the frequency of circularly polarized signals, but the structure becomes more complex and the gain is reduced
Solution Approach 1:
The patent introduces asymmetry by offsetting the power supply position from the center of the planar emission electrode. This asymmetric power supply position creates a phase difference between the resonance frequencies in the longitudinal and lateral directions, enabling circular polarization characteristics without requiring complex structural modifications. The asymmetric positioning of the power supply member simplifies the overall structure while achieving the desired polarization performance.
2Reliability
If the planar emission electrode is adjusted to achieve circular polarization characteristics, then the axial ratio corresponds to the frequency of circularly polarized signals, but the gain is reduced
Solution Approach 1:
The patent utilizes parameter changes by adjusting the position of the power supply member relative to the center of the planar emission electrode. By changing the positional parameter (offset distance), the phase difference between resonance frequencies is controlled, enabling circular polarization. This parameter-based approach maintains high gain characteristics while achieving the desired polarization performance, avoiding the need for complex structural changes that would reduce gain.
3Reliability
If the phase difference between resonance frequencies is adjusted for circular polarization, then circularly polarized signals can be transmitted and received, but the device thickness increases
Solution Approach 1:
The patent extracts the phase difference adjustment function from the structural geometry and implements it through the power supply position offset. Instead of increasing device thickness to achieve the necessary phase difference for circular polarization, the invention separates the phase control function from the physical dimensions, using the asymmetric power supply position to create the required phase relationship between resonance frequencies. This maintains minimal device thickness while achieving circular polarization characteristics.
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 a patch antenna device with high gain and effective circular polarization characteristics, allowing for efficient reception and transmission of circularly polarized signals while maintaining a simple structure, and can be easily integrated into radio wave receivers with minimal thickness.
Implementation Method 1
A power supply position of the power supply member to supply electric power to the planar emission electrode is deviated from a center of the planar emission electrode so as to obtain circular polarization characteristics
Implementation Method 2
adjusts the phase difference between resonance frequencies to achieve circular polarization characteristics
Data Source
AI summary
A patch antenna device of the present invention includes a rectangular dielectric plate, a planar emission electrode, a grounding electrode and a power supply member. The planar emission electrode is provided with a slit at each position corresponding to each short side of the rectangular dielectric plate and both slits extend toward an opposing short side each other and arranged symmetrically. A power supply position of the power supply member is deviated from a center of the planar emission electrode so as to obtain circular polarization characteristics. As a result a patch antenna device having a high gain and circular polarization characteristics can be realized by a simple structure.