Center-Fed Antenna Device with Parallel Ground Plate Extensions
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Solution Overview
Problem
Antenna devices with a feeding point located distant from the outer periphery to the center side of a ground conductor plate are limited in their ability to correspond to polarized waves in a direction parallel to the ground conductor plate.
Innovation Solution
The antenna device includes a ground conductor plate with an antenna element comprising vertical and parallel portions, where the feeding point is positioned at the center side, and parallel portions extend along the outer periphery of the ground conductor plate, enhancing directivity gain for polarized waves parallel to the plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the feeding point is located at the center side of the ground conductor plate, then the antenna can correspond to polarized waves in a direction parallel to the ground conductor plate, but the directivity gain is insufficient
Solution Approach 1:
The patent extends the antenna element in the horizontal direction (parallel to the ground plate) in addition to the vertical direction, creating a three-dimensional structure that captures polarized waves from multiple directions simultaneously, thereby improving both adaptability and directivity gain
Solution Approach 2:
The antenna element is divided into multiple sections including vertical portions and horizontal parallel portions, with each segment serving a specific function in capturing different polarized wave components, allowing optimized performance for center-fed configurations
2Reliability
If the feeding point is located at the peripheral position on the substrate, then the directivity gain is improved, but the antenna can only correspond to polarized waves in a direction perpendicular to the ground conductor plate
Solution Approach 1:
The antenna element is designed to perform multiple functions simultaneously: it captures both vertically polarized waves (perpendicular to ground plate) and horizontally polarized waves (parallel to ground plate) through its three-dimensional structure, making the antenna universally applicable for different polarization directions
Solution Approach 2:
By adding horizontal extensions parallel to the ground plate while maintaining vertical elements, the antenna operates effectively in both vertical and horizontal dimensions, enabling it to handle polarized waves from multiple directions regardless of feeding point location
Data Source
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AI summary
Provided is an antenna device that has a configuration in which a feeding point is located at a position that is distant from an outer periphery of a ground conductor plate to a center side and that would correspond to polarized waves parallel to the ground conductor plate. An antenna device 1 includes a ground conductor plate 5 and an antenna element 10. The antenna element 10 includes a first vertical portion 11 and a second vertical portion 12 which are erected substantially perpendicularly from the ground conductor plate 5 and a first parallel portion 13, a second parallel portion 14, and a third parallel portion 15 which extend substantially parallel to the ground conductor plate 5. An end portion, in the -Z direction, of the first vertical portion 11 serves as a feeding point 7 and is located at a position that is distant from an outer periphery of the ground conductor plate 5 to a center side. The second parallel portion 14 and the third parallel portion 15 extend along the outer periphery of the ground conductor plate 5 when viewed from a direction perpendicular to the ground conductor plate 5.