Antenna Reflecting Unit Resonance for Radio Wave Interference
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Solution Overview
Problem
Patch antennas installed in environments where radio waves are reflected, such as vehicle bumpers, experience interference from re-reflected waves, leading to adverse effects on radiation characteristics and erroneous target detection.
Innovation Solution
An antenna apparatus with a dielectric substrate, a base plate as the antenna ground surface, and a reflecting unit comprising conductor patterns that resonate in a direction different from the polarization direction of the radio waves, effectively suppressing interference by orienting the reflected waves in a direction different from the radiated waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflecting unit with conductor patterns is added to suppress re-reflected waves, then interference from reflected waves is reduced, but device complexity increases
Solution Approach 1:
The antenna apparatus is divided into distinct functional units: the antenna unit with radiating elements for primary radiation, and the reflecting unit with conductor patterns for wave reflection control. This segmentation allows each unit to be optimized independently while working together to suppress re-reflected waves and improve reliability
Solution Approach 2:
The reflecting unit acts as an intermediary component between the antenna unit and the environment. By positioning the conductor patterns at specific distances from the radiating elements and orienting them at 45 degrees, the reflecting unit mediates the interaction between radiated waves and reflected waves, converting harmful re-reflected waves into useful reflected waves
2Object-affected harmful factors
If conventional reflecting surfaces are used to redirect reflected waves, then interference in the radiating direction is suppressed, but strong beams form in other directions causing erroneous detection
Solution Approach 1:
The conductor patterns in the reflecting unit are designed with specific local properties: each pattern is smaller than the effective wavelength at the operating frequency, and the patterns are arranged in a grid with specific spacing. This local quality control ensures that the reflecting unit suppresses interference in the radiating direction while preventing the formation of strong erroneous beams in other directions
Solution Approach 2:
The conductor patterns are oriented at 45 degrees relative to the polarization direction of the radiated waves, creating an asymmetric configuration. This asymmetric orientation causes the reflecting unit to redirect reflected waves at angles different from the radiating direction, preventing both interference in the main beam and the formation of strong side lobes that could cause erroneous detection
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 the adverse effects of re-reflected waves, preventing interference with the radiated waves and reducing the formation of strong beams that cause erroneous target detection, even in environments with significant radio wave reflection.
Implementation Method 1
Each of the plurality of conductor patterns included in the reflecting unit has a size smaller than an effective wavelength at a preset operating frequency of the antenna unit and is structured to resonate in a resonating direction different from a polarization direction of a radio wave transmitted and received by the antenna unit
Implementation Method 2
a reflected wave reflected by the reflecting unit corresponds to a polarized wave polarized in a direction different from the polarization direction in the antenna unit
Implementation Method 3
a portion of a radio wave radiated from the antenna is reflected at an inner wall of the bumper and further re-reflected at a radiating surface of the antenna
Data Source
AI summary
An antenna apparatus includes a dielectric substrate, a base plate, an antenna unit, and a reflecting unit. A plurality of conductor patches are structured to resonate, at an operating frequency of the antenna unit, in a resonating direction which is different from a polarization direction Dan of a radio wave transmitted and received by the antenna unit.