Endfire Antenna Multilayer Loading High Gain Compact Size
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Solution Overview
Problem
Conventional antenna design techniques struggle to achieve high gain characteristics when the length of the dielectric substrate is reduced, limiting the ability to obtain high gain in millimeter-wave band applications.
Innovation Solution
The endfire antenna apparatus employs a multilayer loading structure with conductive strip elements placed at intervals of a quarter or less of the reference adjacent distance, forming capacitively coupled groups on both sides of the dielectric transmission substrate, which includes a removed region to enhance electromagnetic wave leakage and radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the length of the dielectric substrate is reduced to achieve compact antenna size, then the antenna size is reduced, but the gain characteristics deteriorate
Solution Approach 1:
The patent transitions from a conventional single-layer loading structure to a multilayer loading structure, adding the dimensional aspect of layer stacking. This allows the antenna to maintain high gain characteristics in a compact form by utilizing the vertical dimension (multiple layers) rather than expanding the horizontal substrate area, thus resolving the contradiction between compact size and high gain performance
Solution Approach 2:
The patent implements nested loading structures where multiple conductive patterns are stacked in different layers, with each layer containing loading elements. The layers are positioned such that conductive patterns in upper layers are aligned or offset relative to lower layers, creating a nested configuration that enhances electromagnetic wave leakage and radiation efficiency without increasing the overall footprint, thereby maintaining high gain in a compact antenna
2Device complexity
If conventional single-layer loading structures are used, then the structure is simple, but the radiation efficiency and gain are insufficient
Solution Approach 1:
The patent employs a composite loading structure combining multiple conductive patterns in different layers, where each layer contributes differently to the overall radiation performance. The multilayer configuration creates a composite electromagnetic structure that enhances wave leakage and radiation efficiency, overcoming the limitations of simple single-layer structures while maintaining manageable complexity through systematic layer arrangement
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 allows for high gain characteristics with a reduced antenna size, achieving greater gain and sidelobe suppression without increasing the substrate area, suitable for millimeter-wave band applications where high gain and compact size are essential.
Implementation Method 1
a multilayer loading structure provided on at least one side of the dielectric transmission substrate, and for leaking out of a surface of the dielectric transmission substrate a part of intra-substrate transmission components of an electromagnetic wave inside the dielectric transmission substrate as surface transmission components
Implementation Method 2
the conductive strip elements of the first conductive strip group and the conductive strip elements of the second conductive strip group are formed to be capacitively coupled to one another
Implementation Method 3
an endfire antenna apparatus, efficiently radiating in a direction parallel to a substrate that is provided with a plurality of conductive elements composing the antenna
Data Source
AI summary
A plurality of conductive strip elements compose multilayer loading structures on top and bottom surfaces of a dielectric transmission substrate, by which a part of intra-substrate transmission components of a electromagnetic wave are leaked out of the surfaces. Each multilayer loading structure includes a first conductive strip group of conductive strip elements within a first plane, and a second conductive strip group of conductive strip elements within a second plane, and the first and second conductive strip groups are formed to be capacitively coupled to each other. In each of the first and second conductive strip groups, the conductive strip elements are placed at intervals of a distance of a quarter or less of a reference adjacent distance, where the reference adjacent distance is defined as a distance for generating spatial harmonics of the electromagnetic wave on the surfaces of the dielectric transmission substrate.