Magneto-Electric Dipole Antenna Layout for Lower Back Radiation
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Solution Overview
Problem
The Yagi-Uda antenna has a maximum gain of 9.76 dBi, which is suboptimal, and suffers from high back radiation.
Innovation Solution
A magneto-electric dipole antenna design comprising a substrate module, director, feeding module, ground layer, and reflector, configured to operate in a frequency band of 27.5 GHz to 30 GHz, with a reflector reflecting backward radiation and directors directing both forward and reflected radiation to enhance gain and reduce back radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Yagi-Uda antenna is used, then the antenna can provide directional radiation, but the gain is limited to maximum 9.76 dBi and back radiation is high
Solution Approach 1:
The antenna is divided into multiple functional segments: a dipole antenna element, a reflector element, and multiple director elements. Each segment serves a specific function in controlling the radiation pattern, with directors enhancing forward radiation and the reflector suppressing backward radiation, thereby reducing back radiation while improving gain.
Solution Approach 2:
The patent introduces a substrate with multiple layers (first substrate, second substrate, third substrate) and uses conductive vias to connect elements across different layers. This three-dimensional configuration allows for better control of radiation patterns and reduces back radiation by distributing electromagnetic fields in multiple spatial dimensions.
2Reliability
If a Yagi-Uda antenna is used, then the antenna structure is relatively simple, but the gain is insufficient for advanced communication requirements
Solution Approach 1:
The antenna employs a nested multi-layer substrate structure where the first substrate contains the dipole and first director, the second substrate contains the second director, and the third substrate contains the reflector. Conductive vias nest through all layers to interconnect these elements, creating a compact three-dimensional configuration that achieves high gain while maintaining manageable structural complexity.
Solution Approach 2:
Conductive vias serve as intermediaries to connect the dipole antenna element, directors, and reflector across different substrate layers. These vias enable electromagnetic coupling between elements in different spatial planes, allowing the antenna to achieve high gain through coordinated operation of all elements while maintaining a structured and manufacturable design.
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 magneto-electric dipole antenna achieves a gain greater than 6.0 dB and a front-to-back ratio of 15.4 dBi, while the antenna array achieves a gain of 11.25 dBi and a front-to-back ratio of 13.83 dBi, significantly improving performance over the Yagi-Uda antenna.
Implementation Method 1
a reflector reflecting backward radiation
Implementation Method 2
a director directing both forward and reflected radiation
Data Source
Figure 1
Figure 2
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AI summary
A magneto-electric dipole antenna includes a substrate module (1), a director (2), a reflector (5) and a feeding module (3). The director (2) is disposed on an upper surface of the substrate module (1). The reflector (5) is disposed on a lower surface of the substrate module (1). The feeding module (3) is disposed in the substrate module (1) between the director (2) and the reflector (5). When a to-be-outputted signal is fed to the feeding module (3), a forward radiation that transmits in a forward direction (Z) pointing from bottom to top is generated, a backward radiation that transmits in a backward direction reverse to the forward direction (Z) is generated and is reflected by the reflector (5), and the forward radiation and the backward radiation thus reflected are directed by the director (2) so as to generate an electromagnetic wave.