Planar Antenna Layout for Compact Circular Polarization
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Solution Overview
Problem
Existing antenna devices face challenges in reducing size due to three-dimensional structures and increased area occupation, and are limited in their ability to transmit and receive circularly polarized radio waves.
Innovation Solution
The antenna device features a ground portion with a linear connection on a substrate, a power feeding portion divided into three equal parts, and an element portion that protrudes from the substrate to receive power, allowing for the transmission and reception of circularly polarized radio waves by generating a rotating electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power feeding element and the parasitic element are erected from the ground plate via the dielectric to form a three-dimensional shape, then the antenna can transmit and receive circularly polarized radio waves, but the height of the antenna increases making it unsuitable for regions with height limits
Solution Approach 1:
The patent transitions from a three-dimensional erected structure to a two-dimensional planar configuration. The power feeding element and parasitic element are arranged side-by-side on the ground plate surface rather than being erected vertically, eliminating the height constraint while preserving the circular polarization capability through the planar geometric arrangement of the elements
Solution Approach 2:
The patent removes the dielectric material that was previously used to support the erected elements. By taking out the dielectric and reconfiguring the elements to lie flat on the ground plate, the antenna achieves its compact profile while maintaining functionality through the modified planar geometry of the conductive elements
2Adaptability or versatility
If a parallel antenna device with a pair of antenna elements is used to achieve wide-band circularly polarized wave transmission, then the polarization capability is improved, but the area occupied by the antenna device increases
Solution Approach 1:
The patent merges the power feeding element and parasitic element into a closely integrated planar configuration on the same ground plate. By combining these elements in a two-dimensional arrangement with shared ground reference, the antenna achieves circular polarization and wide-band performance without requiring the larger area that would be needed for separated parallel element structures
Solution Approach 2:
The patent resolves the area expansion issue by transitioning from a three-dimensional parallel element arrangement to a two-dimensional planar layout. This dimensional change allows the antenna to maintain compact footprint while achieving the desired polarization and bandwidth characteristics through the planar geometric relationships between elements
3Device complexity
If a monopole antenna with a circular disk-shaped coplanar waveguide transmission line is used, then the device complexity is reduced, but the antenna can only transmit and receive one type of polarized radio waves
Solution Approach 1:
The patent enhances the monopole antenna's functionality by adding a parasitic element configured to support multiple polarization modes. The power feeding element connects to both the ground plate and the parasitic element, enabling the single-structure antenna to transmit and receive both circularly polarized and linearly polarized radio waves, thus achieving multi-functionality without significantly increasing structural complexity
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
This configuration enables a compact antenna device capable of efficiently transmitting and receiving circularly polarized radio waves, while also supporting vertically and horizontally polarized waves, with a VSWR value of 3 or smaller in a wide frequency range.
Implementation Method 1
an element portion configured to receive power from the power feeding portion and formed in a conductor portion of the substrate that is insulated from the ground portion in a state in which the element portion protrudes from the first range toward the other side in the second direction with respect to the linear portion
Data Source
AI summary
An antenna device includes a ground portion including a linear portion connecting a first point and a second point to each other along a first direction parallel to a surface of a substrate, on one side in a second direction orthogonal to the first direction, a power feeding portion provided in a first range including the first point, and an element portion configured to receive power from the power feeding portion and formed in a conductor portion of the substrate that is insulated from the ground portion in a state in which the element portion protrudes from the first range toward the other side in the second direction. The element portion includes a first element portion protruding in the first range toward the other side in the second direction, and a second element portion extending along the first direction from the first element portion toward the second point.