3D Vehicle-Side Antenna Structure for Direct-Wave Distance Sensing
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Solution Overview
Problem
Patch antennas attached to vehicle sides face challenges in accurately determining distance to portable devices due to high-frequency radio waves being reflected by objects, leading to reduced measurement accuracy and increased reliance on reflected waves, which can distort distance calculations.
Innovation Solution
An antenna device with a substrate, ground plate, and three-dimensional elements that include a standing portion perpendicular to the substrate and a parallel portion, designed to enhance gain in the horizontal direction relative to the vertical, allowing for better reception of direct waves from portable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a patch antenna is attached to a vehicle side section, then wireless communication with portable devices can be performed, but distance measurement accuracy deteriorates due to high-frequency radio waves being reflected by objects
Solution Approach 1:
The patent transitions from a conventional planar patch antenna to a three-dimensional antenna structure with elements extending perpendicular to the substrate. This dimensional change enables the antenna to receive radio waves from multiple angles, prioritizing direct waves while reducing reliance on reflected waves, thereby improving distance measurement accuracy.
Solution Approach 2:
The antenna employs an asymmetric configuration where the second element includes a standing portion perpendicular to the substrate and a substrate parallel portion, creating unequal radiation patterns in different directions. This asymmetry enhances gain in the horizontal direction relative to the vertical, optimizing direct wave reception while minimizing the impact of reflected waves.
2Length of moving object
If antenna height is reduced, then the antenna can be more compact for vehicle mounting, but reception performance may deteriorate
Solution Approach 1:
The patent achieves compactness by designing the second element with a three-dimensional structure where portions extend perpendicular to the substrate. This vertical extension provides additional radiation and reception capability without increasing the horizontal footprint, maintaining reliable reception performance while enabling reduced overall antenna height for compact vehicle mounting.
Solution Approach 2:
The antenna structure incorporates dynamic current distribution through its three-dimensional elements, allowing the current to flow along both the standing portion and the substrate parallel portion. This dynamic current path optimization maintains reception performance despite reduced physical dimensions.
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 configuration enhances radio wave reception in the horizontal direction, reducing antenna height and improving distance measurement accuracy by prioritizing direct wave reception over reflected waves, thus minimizing dead zones around the vehicle.
Implementation Method 1
The second element includes a standing portion perpendicular to the substrate and a substrate parallel portion extending from an upper end of the standing portion in a direction parallel to the substrate
Data Source
AI summary
An antenna device includes a substrate, a ground plate, a first element, and a second element. The substrate is a plate-shaped dielectric. The ground plate is a plate-shaped conductor provided on or inside the substrate. The first element is a liner conductive element extending along the surface of the substrate. The second element is a liner conductive element having a three-dimensional shape. The second element includes a standing portion perpendicular to the substrate and a substrate parallel portion extending from an upper end of the standing portion in a direction parallel to the substrate. The substrate parallel portion includes a portion that is parallel to a part of the first element. One of ends: a lower end of the standing portion and an end of the first element, is connected to a feed line, and another of the ends is electrically connected to the ground plate.