Annular Circularly Polarized Antenna for Compact Satellite Positioning
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Solution Overview
Problem
The use of linearly polarized antennas in intelligent terminals results in poor satellite positioning performance due to size and industrial design limitations, making it difficult to implement circularly polarized antennas.
Innovation Solution
A circularly polarized antenna design utilizing an annular radiator with a breakpoint and a series-connected capacitor or inductor, adjusting the breakpoint's position and capacitance/inductance to achieve a 90° phase difference between resonant modes, allowing for miniaturization and improved satellite positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If linearly polarized antennas are used in intelligent terminals, then the device size can be reduced, but the satellite positioning performance deteriorates
Solution Approach 1:
The patent changes the polarization parameter from linear to circular, and introduces reactive components (capacitors or inductors) to modify the resonant frequency parameters. By adjusting the breakpoint position and component values, the antenna achieves circular polarization with two resonant modes having 90° phase difference, thereby improving satellite positioning performance while maintaining compact size
Solution Approach 2:
The patent introduces asymmetry by creating a breakpoint in the annular radiator and connecting reactive components at specific positions. This asymmetric structure enables the generation of two orthogonal resonant modes with 90° phase difference, which is essential for achieving circular polarization and improving positioning performance
2Reliability
If circularly polarized antennas are implemented, then the satellite positioning performance is improved, but the device size increases
Solution Approach 1:
The patent segments the annular radiator by introducing a breakpoint, which allows independent control of different resonant modes. This segmentation enables achieving circular polarization with a compact annular structure rather than requiring larger traditional circularly polarized antenna configurations
Solution Approach 2:
The patent transitions from a simple linear structure to an annular (circular) structure, utilizing the circular geometry to naturally support orthogonal resonant modes. This dimensional change from linear to circular configuration enables circular polarization in a compact form factor suitable for terminal devices
3Reliability
If multiple radiators are used to achieve circular polarization, then the polarization performance is improved, but the space occupation increases
Solution Approach 1:
The patent merges multiple resonant modes into a single annular radiator structure. By designing the annular radiator with a breakpoint and reactive components, it simultaneously supports two orthogonal resonant modes with 90° phase difference, achieving circular polarization functionality that would traditionally require separate radiators in a single integrated structure
Solution Approach 2:
The annular radiator with breakpoint serves multiple functions: it generates two orthogonal resonant modes, provides 90° phase difference between modes, and achieves circular polarization. This multi-functional design eliminates the need for separate radiators while maintaining compact size
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 design reduces the number of radiators needed, minimizing space occupation and enhancing satellite positioning performance while maintaining circular polarization.
Implementation Method 1
the resonant frequencies of the first mode and the second mode of the radiator both increase, and the resonant current of the first mode of the radiator and the resonant current of the second mode of the radiator are perpendicular to each other
Implementation Method 2
a first capacitor or a first inductor is connected in series with the annular radiator at the first breakpoint
Implementation Method 3
a first capacitor or a first inductor is connected in series with the annular radiator at the first breakpoint
Data Source
AI summary
Provided are a circularly polarized antenna and an intelligent terminal. The circularly polarized antenna includes an annular radiator and a first feed terminal. A first breakpoint is provided on the radiator, and a first capacitor or a first inductor is connected in series with the radiator at the first breakpoint. One end of the first feed terminal is electrically connected to the radiator, and another end of the first feed terminal is electrically connected to a first feed module of a mainboard. When a capacitor or inductor is connected in series with the radiator at the first breakpoint, the resonance frequencies of a first mode and a second mode excited on the radiator which are mutually perpendicular will both change, so that the difference between the resonance phase of the first mode and the resonance phase of the second mode reaches 90°, thereby the circular polarization is realized.