Antenna Substrate Layout for Harmonic Wave Suppression
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Solution Overview
Problem
Existing antennas struggle to maintain the characteristics of the fundamental radio wave while minimizing the influence of harmonic waves on their surroundings.
Innovation Solution
The antenna device features a plate-shaped radiating element and a dielectric substrate with adjustment regions around the radiating element, where the dielectric material is thinner than in non-adjustment regions, creating a different effective dielectric constant to reduce harmonic wave radiation while maintaining fundamental wave characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional antenna structure is used, then the fundamental wave characteristics are radiated, but the harmonic wave influence on peripheries cannot be reduced
Solution Approach 1:
The patent applies local quality by creating adjustment regions with different dielectric constants in specific locations around the radiating element. These localized regions with modified electromagnetic properties selectively affect harmonic waves while preserving fundamental wave characteristics, thereby reducing harmonic wave influence on peripheries without compromising the reliability of the fundamental wave radiation.
Solution Approach 2:
The patent changes the dielectric constant parameter in specific regions of the dielectric substrate to create adjustment regions. By modifying the electromagnetic parameter (dielectric constant) in these localized areas, the antenna selectively controls the radiation characteristics of harmonic waves while maintaining the fundamental wave properties, thus resolving the contradiction between reducing harmful harmonic influence and preserving reliable fundamental wave characteristics.
2Object-affected harmful factors
If the dielectric substrate is made thinner to reduce harmonic radiation, then the fundamental wave characteristics deteriorate
Solution Approach 1:
Instead of uniformly thinning the entire dielectric substrate which would deteriorate fundamental wave characteristics, the patent applies local quality by creating adjustment regions with modified dielectric properties only in specific areas. This localized modification selectively reduces harmonic wave radiation while preserving the overall dielectric structure needed for maintaining fundamental wave characteristics.
Solution Approach 2:
The patent segments the dielectric substrate into different regions: adjustment regions with modified dielectric constants for harmonic wave control, and non-adjustment regions that maintain the original structure for fundamental wave support. This segmentation allows independent optimization of each region's function, reducing harmonic radiation without compromising fundamental wave characteristics.
3Object-affected harmful factors
If adjustment regions with different dielectric constants are introduced, then harmonic wave characteristics are adjusted, but the device structure becomes more complex
Solution Approach 1:
The patent implements local quality modifications directly on the existing dielectric substrate by creating adjustment regions with different dielectric constants. This approach integrates the harmonic control function into the substrate itself rather than adding separate components, thereby adjusting harmonic wave characteristics while minimizing increases in overall device complexity.
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 effectively adjusts the characteristics of the harmonic wave to minimize its influence on peripheries while preserving the characteristics of the fundamental wave, as demonstrated by reduced return loss and narrower radiation angles for harmonic waves.
Implementation Method 1
the dielectric substrate has adjustment regions around the first radiating element on an outer side with respect to the first boundary planes and on an outer side with respect to the second boundary planes. The adjustment regions include a designated region where an effective dielectric constant is different from an effective dielectric constant in a non-adjustment region
Data Source
AI summary
An antenna device includes a plate-shaped radiating element that radiates a radio wave polarized in an X-axis direction, a grounding electrode (GND), and a dielectric substrate that carries the radiating element and the grounding electrode (GND). In the dielectric substrate, dielectric in designated regions, which are included in adjustment regions that are located on the outer side with respect to first boundary planes and on the outer side with respect to second boundary planes, is thinner than dielectric in a non-adjustment region. The first boundary planes are planes extending on end faces of the radiating element on the respective sides in an X-axis direction (polarization direction) and being orthogonal to the X-axis direction. The second boundary planes are planes extending on end faces of the radiating element on the respective sides in a Y-axis direction and being orthogonal to the first boundary planes and to the Y-axis direction.