Circularly Polarized Antenna Structure Without High-Frequency Substrates
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Solution Overview
Problem
Existing circularly polarized patch antennas are expensive due to the use of high-frequency substrates and face challenges in downsizing, particularly when configured as array antennas, as they require intervals equal to or less than half the signal wavelength.
Innovation Solution
A circularly polarized antenna design comprising a metal plate with supporting sections and extension sections that form perturbation elements, allowing for excitation modes to intersect spatially and generate circularly or elliptically polarized waves without the need for high-frequency substrates, thereby reducing size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-frequency substrate is used to ensure desired antenna characteristics, then the antenna performance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the high-frequency substrate from the antenna structure, replacing it with a metal plate and supporting sections that can be directly mounted on a circuit board. This removal of the expensive substrate component directly reduces manufacturing cost while maintaining antenna functionality through the alternative support structure.
Solution Approach 2:
The patent changes the structural parameters of the antenna by introducing extension sections with specific lengths and configurations. These parameter changes allow the antenna to achieve desired characteristics without relying on the high-frequency substrate, thereby reducing cost while maintaining performance.
2Device complexity
If a conventional patch antenna design is used, then the antenna structure is simple, but the antenna size is large
Solution Approach 1:
The patent introduces extension sections that protrude from the metal plate in specific directions, utilizing spatial dimensionality to create compact antenna structures. The extension sections with lengths of 0.05λ to 0.15λ in different directions enable the antenna to achieve desired electrical characteristics in a reduced overall size compared to conventional planar patch antennas.
Solution Approach 2:
The antenna structure nests multiple functional elements within a compact form: the metal plate contains the radiating elements, the supporting sections provide structural support and grounding, and the extension sections add electrical functionality without significantly increasing the footprint, creating a space-efficient nested configuration.
3Measurement precision
If an array antenna is used for angle-of-arrival estimation, then the measurement precision is improved, but the overall device size increases
Solution Approach 1:
The compact antenna design with extension sections in multiple directions enables array elements to be placed closer together while maintaining performance. This dimensional optimization allows array configurations for angle-of-arrival estimation to achieve the required element spacing without proportionally increasing the overall array footprint.
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 achieves a cheaper and smaller antenna capable of transmitting and receiving wireless signals, maintaining desired performance characteristics while allowing for array configurations without the use of high-frequency substrates.
Implementation Method 1
a plurality of extension sections that extend from an outer edge of the metal plate toward a direction of the circuit board but have no contact with the circuit board; wherein the plurality of extension sections operate as perturbation elements that form two excitation modes, the two excitation modes spatially intersecting with one other
Data Source
AI summary
There is provided an antenna that transmits and receives a wireless signal compliant with a designated communication standard, the antenna comprising: a metal plate that is disposed on a circuit board; a first supporting section that supports the metal plate and connects the metal plate to a feed point formed on the circuit board; at least one second supporting section that supports the metal plate and connects the metal plate to a ground plane formed on the circuit board; and a plurality of extension sections that extend from an outer edge of the metal plate toward a direction of the circuit board but have no contact with the circuit board; wherein the plurality of extension sections operate as perturbation elements that form two excitation modes, the two excitation modes spatially intersecting with one other.