Surface Current Suppression Filter with Multi-EBG Rows
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Solution Overview
Problem
The existing technology for suppressing surface current in patch antennas mounted on moving bodies, such as vehicles or aircraft, has a narrow stopband, limiting the frequency band that can be effectively blocked, which results in insufficient suppression of surface current and subsequent disturbance in antenna directivity.
Innovation Solution
A surface current suppression filter with a bandstop configuration, featuring multiple conductive structures with differing cutoff characteristics, is arrayed on a dielectric substrate to effectively block surface current propagation. Each structure includes a patch conductor and a connecting conductor that passes through the substrate to connect with a ground plane, and the structures are alternately arranged to widen the frequency band that can be suppressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic band gap (EBG) structures are used to suppress surface current, then surface current propagation is inhibited at specific frequency, but the stopband is narrow and the frequency band that can be suppressed is limited
Solution Approach 1:
The patent combines multiple EBG structures with different cutoff characteristics into a single integrated filter system. By merging structures with complementary stopbands, the overall frequency coverage is expanded while maintaining effective surface current suppression across a broader spectrum
Solution Approach 2:
The invention uses composite EBG structures composed of different geometric configurations and materials with varying electromagnetic properties. These composite structures exhibit combined cutoff characteristics that broaden the overall stopband coverage beyond what single structures can achieve
2Adaptability or versatility
If multiple EBG structures with different cutoff characteristics are arrayed to widen the stopband, then the frequency band coverage is improved, but the device complexity increases
Solution Approach 1:
The filter is segmented into multiple modular EBG units, each with specific cutoff characteristics. These standardized modules can be systematically arranged in sequences or arrays, making the design process more manageable and the complexity more controllable through modular assembly
Solution Approach 2:
The invention systematically varies key parameters of EBG structures (such as patch dimensions, via hole sizes, and spacing) to generate structures with different cutoff characteristics. This parameter-based design approach allows for controlled complexity while achieving the desired broad frequency coverage
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 solution effectively suppresses surface current propagation over a wider frequency band, reducing unnecessary radiation and maintaining antenna directivity by utilizing the differing cutoff characteristics of the conductive structures, thereby enhancing the suppression effect beyond the limitations of existing technologies.
Implementation Method 1
The structure composed of the conductive patch and the conductive via has a band gap (electromagnetic band gap) that inhibits propagation of the surface current on the ground plane at a specific frequency
Data Source
AI summary
A surface current suppression filter (1) is a bandstop filter that suppresses propagation of a surface current in a predetermined propagation direction on a dielectric substrate (2). The filter (1) is configured such that a plurality of electromagnetic band gap (EBG) rows (10, 20) are arrayed in an array direction. Each EBG row (10, 20) has at least one EBG (11, 21) that is arrayed in a perpendicular direction orthogonal to the array direction. Cutoff characteristics of a first EBG (11) in the first EBG row (10) differs from cutoff characteristics of a second EBG (12) in the second EBG row (20).