Magneto-Electric Dipole Array Feed Structure for Coupling Suppression
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Solution Overview
Problem
Existing magneto-electric dipole antenna arrays face challenges in achieving enhanced gain, impedance bandwidth, impedance matching, and antenna isolation while effectively suppressing mutual coupling between antenna units.
Innovation Solution
The proposed magneto-electric dipole antenna array incorporates a substrate with electric-dipole and magnetic-dipole components, capacitive coupling via striplines, and parasitic resonators to enhance gain and suppress mutual coupling, featuring a 2x2 array configuration with L-shaped and meandering parasitic resonators to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If microstrip lines are used to connect adjacent magneto-electric dipole units, then the antenna array can be formed, but mutual coupling between antenna units occurs and performance is compromised
Solution Approach 1:
A stripline is introduced as an intermediary component between adjacent magneto-electric dipole units to replace direct microstrip line connections. The stripline acts as a mediator that enables signal transmission while reducing mutual coupling effects, thereby improving antenna isolation without compromising the ease of forming the antenna array.
Solution Approach 2:
The feeding structure is segmented into multiple components: feed-in lines on the bottom surface, striplines within the substrate, and connection points at antenna unit interfaces. This segmentation allows each component to be optimized independently, with striplines specifically designed to minimize coupling while maintaining manufacturing simplicity.
2Ease of operation
If conventional feed-in structures are used, then antenna units can be connected, but impedance matching and bandwidth are insufficient
Solution Approach 1:
The feed-in structure parameters are optimized by using striplines with specific dimensions and positions within the substrate. The stripline width, length, and distance from the antenna unit interface are carefully controlled to achieve improved impedance matching and extended bandwidth, transforming the feeding mechanism from a simple connection to a tuned impedance-matching structure.
3Power
If antenna units are placed close together to form an array, then gain can be enhanced, but mutual coupling increases and degrades performance
Solution Approach 1:
The stripline serves as a mediating structure between closely spaced antenna units, enabling the array to achieve enhanced gain through proper element spacing while simultaneously acting as a barrier to reduce mutual coupling. The stripline's position within the substrate and its dimensional parameters are optimized to decouple adjacent units electrically while maintaining their radiative interaction for gain enhancement.
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 solution achieves enhanced gain, impedance bandwidth, and antenna isolation, with suppressed mutual coupling, resulting in improved radiation patterns and directivity.
Implementation Method 1
a stripline 25 disposed between the first feeding probe 231 and the second feeding probe 241 for capacitive coupling
Implementation Method 2
Each of the antenna units 2 includes an electric-dipole component 21, a magnetic-dipole component 22
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A magneto-electric dipole antenna array includes a substrate (1) and at least one antenna unit (2). For each of the at least one antenna unit (2): an electric-dipole component (21) is disposed on an upper surface (11) of the substrate (1); a magnetic-dipole component (22) is disposed in the substrate (1) and between the upper surface (11) and a lower surface (12) of the substrate (1), and is electrically connected to the electric-dipole component (21); a first feeding probe (231) is disposed on the upper surface (11) of the substrate (1) for vertical polarization; a second feeding probe (241) is disposed in the substrate (1) and between the upper surface (11) and the lower surface (12) of the substrate (1) for horizontal polarization; and a stripline (25) is disposed in the substrate (1) and between the first feeding probe (231) and the second feeding probe (241) for capacitive coupling.