Monopole Antenna Device With Reflector For Directivity
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Solution Overview
Problem
The existing monopole antenna with a conductive reflector suffers from reduced signal gain in directions opposite to the reflector due to radiation patterns, leading to decreased directivity perpendicular to the antenna element.
Innovation Solution
The antenna device incorporates a pair of monopole antennas with a connection wire and power feeding line, along with a reflector, where the antennas are positioned to overlap the reflector in a side view and are connected in a way that their phases are equal or differ, enhancing directivity by suppressing radiation in unwanted directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a monopole antenna with a conductive reflector is used, then the antenna can emit radio waves, but the gain of signals in the direction opposite to the conductive reflector decreases
Solution Approach 1:
The antenna system is divided into multiple monopole antenna elements (first, second, third, and fourth antenna elements) arranged in a specific configuration. By segmenting the antenna into multiple elements with different orientations and positions, the system can control radiation patterns more effectively and improve gain in desired directions while reducing radiation in unwanted directions.
Solution Approach 2:
Each antenna element is positioned and oriented with specific local characteristics. The first and second antenna elements extend in one direction while the third and fourth extend in another direction, creating localized radiation patterns that collectively improve overall directivity. The conductive reflector is also positioned at specific locations to enhance reflection in desired directions.
2Reliability
If a conductive reflector is added to improve directivity, then radiation in opposite direction is suppressed, but the device complexity increases
Solution Approach 1:
Multiple antenna elements are merged into a single integrated antenna device structure. The first, second, third, and fourth antenna elements along with the conductive reflector are combined into one unified device, achieving improved directivity and signal gain while managing complexity through integrated design rather than separate components.
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 improves directivity in the desired direction by suppressing radiation in the opposite direction, thereby increasing signal gain and reducing noise interference.
Implementation Method 1
a first antenna element that extends in a direction perpendicular to the first surface of the substrate and that functions as a monopole antenna
Implementation Method 2
a first reflector that is provided in a direction in which the first antenna element and the second antenna element are adjacent to each other and that faces the first antenna element and the second antenna element
Data Source
AI summary
An antenna device includes a substrate, a first antenna element extending in a direction perpendicular to a first surface of the substrate and functioning as a monopole antenna, a second antenna element provided adjacent to the first antenna element, extending in the direction perpendicular to the first surface of the substrate, and functioning as a monopole antenna, a ground layer provided in or on the substrate, a connection wire provided in or on the substrate and connecting the first antenna element and the second antenna element to each other, a power feeding line provided in or on the substrate and connected to the connection wire, and a first reflector provided in a direction in which the first antenna element and the second antenna element are adjacent to each other and facing the first antenna element and the second antenna element.