Printed Dipole Antenna Array with Segmented Feed Lines
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Solution Overview
Problem
In high-density wireless local area network (WLAN) deployments, such as stadiums, there is significant co-channel interference between adjacent access point devices due to the large number of users per unit area, which existing directional antennas fail to effectively suppress, leading to increased coverage radius and interference.
Innovation Solution
The use of printed dipole antennas with optimized feed line segments and orientations, where each segment of the feed lines approaches a printed dipole on one side, and adjacent printed dipoles are perpendicular to each other, reducing parasitic emission and implementing a low sidelobe level, particularly within the 5GHz frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional directional antennas are used in high-density WLAN deployments, then coverage radius is increased, but co-channel interference between adjacent access point devices is not effectively suppressed
Solution Approach 1:
The feed line is divided into multiple segments (first segment, second segment, third segment, fourth segment) with different orientations. Each segment is positioned at specific distances from the printed dipole (e.g., first segment at 0.2λ to 0.6λ distance), creating a segmented structure that suppresses parasitic radiation through differential phase and amplitude distribution across segments.
Solution Approach 2:
Adjacent printed dipole antennas are positioned perpendicular to each other (first dipole along x-axis, second dipole along y-axis), creating an asymmetric spatial arrangement. This asymmetric configuration reduces mutual coupling and parasitic radiation between adjacent elements, achieving sidelobe suppression below -16dB.
2Device complexity
If feed lines are positioned parallel to printed dipoles without segmented configuration, then structure is simplified, but parasitic emission increases
Solution Approach 1:
The feed line is divided into multiple segments (first segment, second segment, third segment, fourth segment) with different orientations. Each segment is positioned at specific distances from the printed dipole (e.g., first segment at 0.2λ to 0.6λ distance), creating a segmented structure that suppresses parasitic radiation through differential phase and amplitude distribution across segments.
Solution Approach 2:
The feed line segments extend in multiple spatial dimensions rather than a single linear path. The first and second segments extend in one direction while the third and fourth segments extend in another direction, creating a multi-dimensional feed line configuration that reduces parasitic radiation through spatial diversity.
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 design effectively suppresses parasitic emission and co-channel interference, achieving a low sidelobe level of less than -16 dB in array antennas, improving signal quality and reducing interference in high-density deployments.
Implementation Method 1
each segment approaches a printed dipole on one side of the segment, to suppress parasitic emission of the feed lines
Implementation Method 2
printed dipoles of adjacent printed dipole antennas of the array antenna are perpendicular to each other, reducing parasitic emission between the adjacent printed dipole antennas
Data Source
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AI summary
A printed dipole antenna is provided. The printed dipole antenna includes a first printed dipole, a second printed dipole, a third printed dipole, a fourth printed dipole, a first feed line, a second feed line, a third feed line, and a fourth feed line. The first printed dipole is parallel to the second printed dipole, and is perpendicular to the first feed line. The first printed dipole is connected to one end of the first feed line, and the second printed dipole is connected to the other end of the first feed line. The third printed dipole is parallel to the fourth printed dipole, and is perpendicular to the second feed line. The third printed dipole is connected to one end of the second feed line, and the fourth printed dipole is connected to the other end of the second feed line. One end of the third feed line is connected to the first feed line, the other end of the third feed line is connected to one end of the fourth feed line, and the other end of the fourth feed line is connected to the second feed line.