Dielectric Lens Antenna for Accurate Speed Sensing
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Summary
Problems
Non-contact speed sensors face challenges in accurately measuring speed on low-friction surfaces and under varying weather conditions due to sensitivity degradation and installation complexities, especially when trying to obtain the cos θ speed component without using a frame to incline the sensor module.
Innovation solutions
The use of a cannonball-shaped dielectric lens that is inclined to condense beams and cut parallel to the antenna-mounted board, allowing the dielectric lens antenna to achieve maximum gain in the inclination direction, enabling the sensor to radiate beams effectively without increasing the frontal projected area or air resistance.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a dielectric lens with large opening area is used to improve antenna gain, then gain is improved, but the frontal projected area increases causing road clearance problems and increased air resistance
Why choose this principle:
The dielectric lens is designed with an asymmetric inclined shape rather than a symmetric form. The inclination angle is specifically designed to direct the maximum gain direction at the required incident angle θ to the road surface, while the frontal projected area is reduced to minimize road clearance issues and air resistance. This asymmetric geometry allows the lens to maintain high gain performance without requiring a large frontal area.
Principle concept:
If a frame with slant surface is used to incline the dielectric lens, then the correct incident angle is achieved, but the device complexity and mounting adjustment become complicated
Why choose this principle:
The inclination function is merged directly into the dielectric lens structure itself. The lens is designed with a built-in inclination angle that provides the required incident angle θ to the road surface. This integration eliminates the need for a separate frame structure with slant surfaces, thereby reducing device complexity and simplifying mounting adjustment while maintaining accurate incident angle for speed measurement.
Application Domain
Data Source
AI summary:
The use of a cannonball-shaped dielectric lens that is inclined to condense beams and cut parallel to the antenna-mounted board, allowing the dielectric lens antenna to achieve maximum gain in the inclination direction, enabling the sensor to radiate beams effectively without increasing the frontal projected area or air resistance.
Abstract
A speed sensor which aligns a normal direction of one patch antenna which is disposed on a mounted board, and an optical axis of a dielectric lens uses a frame for inclining a sensor module, in order to obtain a component cos θ in a traveling direction when the speed sensor is installed on a horizontally vertical surface of an automobile or a railway car. When beams are condensed by using the one patch antenna and the cannonball-shaped dielectric lens, the dielectric lens is inclined and a bottom surface portion of the lens is cut with a plane parallel with a surface of the antenna-mounted board. The one patch antenna is configured by one patch and a GND electrode and the gain center of radiation characteristics is a normal direction of the antenna board. However, the radiation characteristics have a substantially hemisphere surface wave shape.