Array Antenna-Conductor Spacing for Low Downward Window Radiation
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Solution Overview
Problem
When an antenna unit is installed facing a window glass, there is a need to suppress the radiation of electromagnetic waves downward to prevent exposure to individuals underneath.
Innovation Solution
The antenna unit is designed with a plurality of array antennas, where the distance from the center of the upper radiating element to the upper edge of the conductor is set to (0.5+n)λ±0.22λ, effectively reducing downward radiation by adjusting the antenna's geometry to minimize gain in specific directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna unit radiates electromagnetic waves in all directions for effective transmission, then the electromagnetic wave transmission performance is improved, but the downward radiation to persons underneath increases causing harmful exposure
Solution Approach 1:
The patent applies local quality by setting different distance parameters for different parts of the antenna structure. Specifically, the distance from the center of the upper radiating element to the upper edge of the conductor is set to (0.5+n)λ±0.22λ, while other dimensions are optimized independently. This creates localized electromagnetic field distribution that suppresses downward radiation while maintaining overall transmission performance.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the distance parameter H1 (from upper radiating element center to conductor upper edge) within the range of (0.5+n)λ±0.22λ. By adjusting this critical parameter, the electromagnetic wave radiation pattern is modified to reduce downward gain while preserving effective transmission in other directions.
2Object-affected harmful factors
If the distance from the upper radiating element to the conductor is adjusted to suppress downward radiation, then the harmful radiation is reduced, but the antenna structure complexity increases
Solution Approach 1:
The patent resolves the complexity issue by optimizing a single critical parameter (H1 = (0.5+n)λ±0.22λ) rather than modifying the entire antenna structure. This parameter change achieves radiation suppression through electromagnetic field distribution control, avoiding the need for additional shielding components or complex multi-element arrangements.
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 significantly reduces downward radiation of electromagnetic waves, thereby protecting individuals underneath the antenna unit while maintaining effective electromagnetic wave transmission.
Implementation Method 1
at least one conductor situated on an interior side or on an exterior side relative to the plurality of radiating elements
Data Source
AI summary
To suppress downward radiation of electromagnetic waves from an antenna unit. An antenna unit to be used by being installed so as to face a window glass for a building, the antenna unit comprising a plurality of array antennas, wherein each of the plurality of array antennas has a plurality of radiating elements and at least one conductor situated on an interior side relative to the plurality of radiating elements, and where the effective wavelength of the plurality of array antennas at the operation frequency is A, and an integer of 0 or more is n, the distance from the center of the upper radiating element among the plurality of radiating elements to the upper edge of the conductor in the up-and-down direction is (0.5+n)A±0.22A, as seen in a plan view of the antenna unit.