Slot Antenna Device With Ridge Waveguide And Artificial Magnetic Conductor
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Solution Overview
Problem
Conventional microstrip lines incur significant dielectric loss at high frequencies above 30 GHz, making them inefficient for antenna devices in millimeter-wave applications, necessitating an alternative waveguide structure to maintain antenna efficiency.
Innovation Solution
A slot antenna device utilizing a ridge-shaped waveguide with an artificial magnetic conductor, where the waveguide body includes a first and second ridge with a slot extending between them, and an artificial magnetic conductor on both sides of the waveguide body, defining a waveguide in a gap that opposes the waveguide surface, allowing for low-loss electromagnetic wave propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If microstrip line is used for feeding antenna elements, then the antenna device can be manufactured with simple structure, but dielectric loss increases significantly at high frequencies above 30 GHz, reducing antenna efficiency
Solution Approach 1:
The patent changes the fundamental parameter of the feeding structure from microstrip line (planar transmission line on substrate) to ridge waveguide (three-dimensional metallic waveguide). This parameter change transforms the propagation mechanism and eliminates dielectric loss by removing the dielectric substrate, allowing efficient operation at frequencies above 30 GHz while maintaining manufacturability through standardized waveguide fabrication processes
Solution Approach 2:
The patent employs a composite structure combining ridge waveguide with artificial magnetic conductor (AMC) ground plane. The AMC consists of periodic metallic structures (patches or posts) on the ground plane that create effective magnetic conductivity, forming a composite electromagnetic environment that enhances waveguide performance and enables compact integration while reducing losses
2Loss of energy
If ridge waveguide with artificial magnetic conductor is used, then dielectric loss is reduced and antenna efficiency is improved, but device complexity increases due to additional waveguide structure
Solution Approach 1:
The ridge waveguide structure serves multiple functions simultaneously: it provides electromagnetic wave propagation guidance, defines the feeding network for multiple antenna elements, and integrates with the AMC ground plane to create boundary conditions for mode control. This multi-functionality reduces the need for separate components, offsetting the apparent structural complexity with functional consolidation
Solution Approach 2:
The waveguide structure is segmented into standardized sections (feed regions, transition regions, antenna element interfaces) that can be independently designed and manufactured. Each section performs a specific function, allowing modular fabrication and assembly, which manages complexity through systematic decomposition of the overall structure
3Loss of energy
If conventional waveguide structures are used, then electromagnetic waves can be guided with reduced loss, but antenna element placement density is limited by waveguide dimensions
Solution Approach 1:
The patent utilizes the third dimension (vertical height) by employing ridge waveguide structure with AMC ground plane, enabling compact integration in the height direction. This allows multiple antenna elements to be placed in close proximity in the planar directions while maintaining low-loss propagation through the vertically-stacked waveguide configuration, effectively increasing antenna element density without compromising signal loss performance
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 realizes low-loss antenna devices by effectively guiding electromagnetic waves with minimal signal distortion, enabling efficient transmission and reception in high-frequency bands, such as the millimeter-wave region, while allowing for high-density antenna element placement.
Implementation Method 1
an artificial magnetic conductor on at least one of the second electrically conductive surface and the third electrically conductive surface, the artificial magnetic conductor extending on both sides of the waveguide body
Implementation Method 2
The third electrically conductive surface, the waveguide surface, and the artificial magnetic conductor define a waveguide in a gap extending between the third electrically conductive surface and the waveguide surface
Implementation Method 3
The at least one slot is open to an external space through the first electrically conductive surface
Data Source
AI summary
A slot antenna device includes a first electrical conductor including first and second electrically conductive surfaces, a second electrical conductor including a third electrically conductive surface that opposes the second electrically conductive surface, a waveguide body on the second electrically conductive surface, and an artificial magnetic conductor extending on both sides of the waveguide body. The first electrical conductor includes a slot. The waveguide body includes a waveguide surface that opposes the third electrically conductive surface. The third electrically conductive surface, the waveguide surface, and the artificial magnetic conductor define a waveguide. The waveguide body includes a first ridge and a second ridge. As viewed from a direction perpendicular or substantially perpendicular to the waveguide surface, the slot is located between the one end of the first ridge and the one end of the second ridge.