Parallel-Resonance Antenna Layout for Low-Height Directional Radiation
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Solution Overview
Problem
Conventional antenna devices require a significant height to transmit and receive radio waves in both perpendicular and parallel directions, which can be cumbersome and may compromise performance when height is reduced, such as using coils to shorten the monopole antenna.
Innovation Solution
An antenna device with a flat plate structure comprising a ground plate, an opposing conductive plate, and a short-circuit portion that generates parallel resonance using inductance and capacitance, allowing for asymmetric arrangement to reduce height while maintaining directional radiation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the height of the antenna device is reduced by using coils to shorten the monopole antenna, then the device becomes more compact, but the radiation performance and directivity are compromised
Solution Approach 1:
The antenna device is segmented into two independent functional units: a patch antenna for vertical direction radiation and a monopole antenna for horizontal direction radiation. Each segment operates independently to provide directional control, allowing the overall device to maintain performance while reducing height through the use of coils in the monopole segment.
Solution Approach 2:
The patch antenna and monopole antenna are merged into a single integrated device structure, where the patch antenna element and monopole antenna element work together to achieve omnidirectional radiation capability. This combination allows the device to compensate for the height reduction by utilizing the complementary radiation patterns of the two antenna types.
2Length of moving object
If the monopole antenna height is reduced, then the device becomes more compact, but the directivity in parallel direction is weakened
Solution Approach 1:
The monopole antenna is designed with asymmetric current distribution through the use of coils, creating an asymmetric radiation pattern that maintains horizontal directivity. The asymmetric structure allows the antenna to achieve the desired directivity control in the parallel direction even with reduced height.
3Device complexity
If a conventional monopole antenna is used, then the structure is simple, but significant height is required to achieve proper radiation
Solution Approach 1:
The monopole antenna utilizes coil structures that create mechanical vibration and resonant effects to enhance radiation efficiency at reduced heights. The coils act as inductive elements that resonate at the operating frequency, allowing the antenna to achieve proper radiation characteristics without requiring full quarter-wavelength height.
4Volume of moving object
If the antenna device height is reduced, then installation space is minimized, but the ability to receive signals from both zenith and horizontal directions is compromised
Solution Approach 1:
The antenna device is designed with multi-functionality to receive signals from multiple directions simultaneously. The patch antenna provides zenith direction reception while the monopole antenna provides horizontal direction reception, creating a universal antenna system that can handle various signal sources (satellite, ground station, etc.) within a compact form factor.
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 antenna device achieves reduced height while maintaining the ability to radiate radio waves in both perpendicular and parallel directions, improving performance by utilizing parallel resonance and asymmetric current distribution to cancel and propagate radio waves effectively.
Implementation Method 1
A parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit portion and a capacitance between the ground plate and the opposing conductive plate
Implementation Method 2
the ground plate is arranged asymmetrically with respect to the opposing conductive plate
Data Source
AI summary
An antenna device includes: a ground plate; an opposing conductive plate provided with a power supply point installed at a predetermined distance from the ground plate; and a short-circuit portion provided in a central region of the opposing conductive plate and electrically connecting the opposing conductive plate and the ground plate. A parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit portion and a capacitance between the ground plate and the opposing conductive plate; and the ground plate is arranged asymmetrically with respect to the opposing conductive plate.