Antenna Device Surface Current Interruption for Radar
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Solution Overview
Problem
Patch antennas in in-vehicle radar systems face interference from reflected radio waves, leading to reduced gain and increased directional ripples due to the complex shape of scatterers and surface wave radiation when both the radiation element and scatterer are formed on the same dielectric substrate.
Innovation Solution
An antenna device comprising a dielectric substrate with a ground plane, an antenna unit, a reflection unit with conductor patches to redirect incident waves, and an interruption unit with through-holes to control surface currents, preventing interference and surface wave radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a scatterer with polyhedral shape is installed around the radiation element to redirect reflected radio waves, then the interference between re-reflected waves and radiation waves is reduced, but the shape of the antenna device becomes complex
Solution Approach 1:
The scatterer is divided into multiple planar reflection surfaces (first reflection surface, second reflection surface, third reflection surface) instead of using a complex polyhedral shape. Each planar surface is configured to reflect radio waves from specific directions to desired directions, achieving the same interference reduction effect while maintaining a simpler overall structure that can be easily integrated with the dielectric substrate
Solution Approach 2:
The invention transitions from a three-dimensional polyhedral scatterer to a two-dimensional planar structure with multiple reflection surfaces arranged on the same plane as the radiation element. This dimensional simplification maintains the wave redirection functionality while eliminating the complexity of立体 shapes, making the antenna device easier to manufacture and integrate
2Device complexity
If the radiation element and scatterer are formed on the same dielectric substrate, then the antenna device structure is simplified, but surface waves flow from the radiation element and are secondarily radiated by the scatterer, increasing directional ripples
Solution Approach 1:
An interruption unit consisting of conductive patterns is introduced as an intermediary element between the radiation element and the scatterer on the dielectric substrate. This interruption unit blocks the propagation path of surface waves, preventing them from reaching the scatterer and being secondarily radiated, thereby eliminating directional ripples while maintaining the structural simplicity of having all components on the same substrate
Solution Approach 2:
The harmful surface wave propagation path is extracted and isolated from the main antenna structure by placing the interruption unit strategically between the radiation element and scatterer. This separates the harmful effect (surface wave radiation) from the useful function (main lobe radiation), allowing the antenna to maintain structural simplicity while eliminating the adverse effect
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 reflection wave interference and reduces directional ripples, enhancing the antenna's directionality even in environments with radio wave reflections.
Implementation Method 1
the reflection unit includes a plurality of first conductor patches which are disposed around the antenna unit and function as a reflection plate, and reflects an incident wave in a direction different from a direction of a radiation wave radiated from the antenna unit
Implementation Method 2
The interruption unit includes a plurality of second conductor patches disposed around the antenna unit and a plurality of through-holes permitting electrical conduction between each of the plurality of second conductor patches and the ground plane, and interrupts a surface current flowing on a surface of the dielectric substrate
Data Source
AI summary
An antenna device includes a dielectric substrate, a ground plane, an antenna unit, a reflection unit, and an interruption unit. The interruption unit includes a plurality of second conductor patches disposed around the antenna unit, and a plurality of through-holes permitting electrical conduction between each of the second conductor patches and the ground plane, and interrupts a surface current flowing on a surface of the dielectric substrate.