Antenna Device Surface Current Suppression
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Solution Overview
Problem
Conventional patch antenna designs face challenges in suppressing surface current-induced unnecessary radiation, leading to directivity disturbances and limited design flexibility due to complex structures and the need for multiple conductive vias, which increases manufacturing costs and restricts the arrangement of high-frequency components.
Innovation Solution
Incorporating passive elements between the patch antenna and edge portions of the dielectric substrate to absorb radio waves and suppress surface currents, using microstrip lines to connect these elements, allowing for efficient energy consumption and stable suppression of surface currents without affecting the main directivity of the patch antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple conductive patches and vias are used to suppress surface current, then surface current suppression is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and removes the complex conductive patches and vias structure from the antenna design. Instead of using multiple conductive elements to suppress surface current, the patent simply omits the conductive section at the edge portion of the dielectric substrate, achieving surface current suppression through structural simplification while maintaining antenna performance
Solution Approach 2:
The conventional approach adds conductive elements to suppress surface current, but this invention inverts the approach by removing the conductive section entirely at the edge portion. This inversion achieves the same surface current suppression effect while eliminating the complexity of multiple patches and vias
2Object-affected harmful factors
If multiple conductive vias are used to connect patches to base plate, then surface current suppression is improved, but manufacturing cost and design complexity increase
Solution Approach 1:
The invention extracts and eliminates the need for multiple conductive vias by removing the conductive section at the edge portion. This extraction approach achieves surface current suppression without requiring any additional vias or complex manufacturing processes, thereby reducing manufacturing cost
3Object-affected harmful factors
If conductive patches are formed on most of the substrate surface, then surface current suppression is improved, but design flexibility for component arrangement is reduced
Solution Approach 1:
The invention extracts and removes the conductive section at the edge portion rather than adding conductive patches across the substrate surface. This extraction approach suppresses surface current while leaving the majority of the substrate surface available for flexible arrangement of high-frequency components and transmission lines
Solution Approach 2:
The invention segments the conductive section placement by specifically positioning it only at the edge portion where surface current flows, rather than covering most of the substrate surface. This segmentation achieves targeted surface current suppression while preserving design flexibility in other areas
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 approach simplifies the antenna structure, effectively reduces directivity disturbances, and enhances design flexibility by suppressing surface currents and unnecessary radiation, while maintaining the performance of the patch antenna.
Implementation Method 1
the first passive element absorbs part of the radio waves transmitted from and received by the patch antenna, and suppresses the surface current flowing toward the edge portions of the dielectric substrate
Data Source
AI summary
An antenna device 1 has a dielectric substrate 2, a patch antenna 5 and electric power absorbing passive elements 21, 24 formed on a surface of the dielectric substrate. Each electric power absorbing passive element 21, 24 is formed between the patch antenna 5 and an edge portion in a polarized wave direction of the dielectric substrate 2. The electric power absorbing passive elements 21, 24 absorb a part of electric power received by the patch antenna 5. This makes it possible to suppress a surface current flowing to the edge portions of the dielectric substrate on a conductive plate (a front-surface conductor plate 3 or a back surface conductor plate 4) on the dielectric substrate.