Antenna Device With Through-Hole Ground For Perpendicular Polarization
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Solution Overview
Problem
Conventional dipole array antennas experience high transmission loss when radiating a polarized wave perpendicular to the signal line in the broadside direction, particularly in high frequency bands.
Innovation Solution
The antenna device features a dielectric substrate with a strip-shaped ground, signal lines, and branch lines on one surface, and holes intersecting with the strip lines on the other surface, allowing for efficient electromagnetic coupling and increased current at branch points to radiate polarized waves perpendicular to the signal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bypass line such as a bending structure is used to connect the dipole element rotated by 90 degrees to the microstrip line, then a polarized wave perpendicular to the signal line can be radiated, but a transmission loss is increased particularly in a high frequency band
Solution Approach 1:
The patent introduces a ground electrode with through-holes as an intermediary structure between the signal line and dipole elements. The through-holes serve as coupling points that enable electromagnetic energy transfer without requiring traditional bypass lines, thereby reducing transmission loss while maintaining the ability to radiate perpendicular polarized waves
Solution Approach 2:
The patent replaces the mechanical bypass line connection structure with an electromagnetic coupling mechanism through the ground electrode and through-holes. This substitution eliminates the need for physical bending structures and direct conductive connections, reducing energy loss particularly in high frequency bands
2Device complexity
If the dipole elements are arranged on two signal lines (front and back surfaces) to radiate a polarized wave parallel to the signal line, then the antenna structure is simplified, but the transmission loss increases when attempting to radiate a polarized wave perpendicular to the signal line
Solution Approach 1:
The patent utilizes the third dimension (through the substrate thickness) by creating through-holes that penetrate the ground electrode from one surface to the other. This vertical dimension enables electromagnetic coupling between signal lines on different surfaces without requiring complex lateral bypass structures, thus maintaining structural simplicity while reducing transmission loss for perpendicular polarization
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 efficient radiation of polarized waves perpendicular to the signal line in the broadside direction with reduced transmission loss across various frequency bands, enhancing the antenna's performance and transparency.
Implementation Method 1
strip lines are supplied with electric power by electromagnetic coupling using the holes
Implementation Method 2
capable of efficiently radiating a polarized wave perpendicular to a signal line in the broadside direction
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
This antenna device (1) is provided with: a ground (4b); strip lines (7a-1 to 7d-1, 7a-2 to 7d-2) that extend from positions facing each other with respect to the width direction of the ground (4b); a plurality of slots (6a to 6d) which is provided to the ground (4b) and which intersects with straight lines along the strip lines (7a-1 to 7d-1, 7a-2 to 7d-2); and branch lines (5a to 5d) which intersect with the slots (6a to 6d) that are positioned to face the branch lines in a back surface.