Vehicle Antenna Module With Offset Radiant Elements
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Solution Overview
Problem
Existing vehicle antennas face challenges in accommodating multiple functions within a reduced space without compromising aerodynamics, often resulting in signal interference due to the close proximity of radiant elements and bulky designs that are not aerodynamically suitable for vehicle roofs.
Innovation Solution
The antenna module features a unique arrangement of at least four radiant elements distributed in transverse, longitudinal, and oblique directions relative to the antenna axis, with pairs of elements offset to minimize mutual interference and optimize radiation patterns, using a base with a rectangular shape and a tapered cover to maintain aerodynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If radiant elements are disposed close to each other to reduce space, then the antenna volume is reduced, but signal coupling and interference occur between the radiant elements
Solution Approach 1:
The patent transitions from planar arrangement of radiant elements to a three-dimensional spatial distribution. The elements are positioned at different heights and angles relative to the vehicle roof surface, utilizing the vertical and angular dimensions to achieve both compact volume and sufficient separation for signal isolation.
Solution Approach 2:
The radiant elements are arranged in an asymmetric configuration rather than uniform spacing. Each element has a specific position and orientation optimized for its function, with varying distances and angles between elements to minimize coupling while maintaining compact overall dimensions.
2Adaptability or versatility
If multiple radiant elements are added to support additional functions, then the antenna functionality is improved, but the device complexity increases
Solution Approach 1:
The antenna module is designed as an integrated multi-functional unit where multiple radiant elements serve different communication functions (AM/FM, GPS, digital radio, mobile telephony) within a single structural assembly. The shared base structure and unified mounting system reduce overall complexity compared to separate antenna units.
Solution Approach 2:
Multiple radiant elements that would traditionally be separate antenna components are merged into a single integrated module with a common base structure. The elements are physically combined in a compact arrangement that supports multiple functions while reducing the total number of separate components and mounting points.
3Device complexity
If radiant elements are aligned along the longitudinal axis, then the antenna structure is simplified, but radiation nulls occur in certain directions
Solution Approach 1:
The patent deliberately positions radiant elements in asymmetric locations relative to the longitudinal axis, with varying offsets in the transverse direction and at different longitudinal positions. This asymmetric arrangement prevents the formation of radiation nulls while maintaining a relatively simple overall structure.
Solution Approach 2:
The radiant elements are distributed in three-dimensional space rather than being confined to a single longitudinal line. Elements are positioned at different transverse offsets and vertical heights, creating a spatial distribution that ensures omnidirectional radiation coverage while keeping the structural design straightforward.
Data Source
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AI summary
Antenna module (100) for a vehicle comprising: a base (1) suitable for being fixed to a part of a vehicle body, a main board (2) disposed horizontally on the base (1), a first, second, third and fourth radiant element (3, 4, 5, 6) that protrude in upper position from the main board (2); the first and the second radiant element (3, 4) have respective median axes (a3, a4) that extend in the direction of the vertical axis (Z) and intersect the horizontal plane of the base (1) in respective intersection points (P1, P2) disposed on both sides with respect to the longitudinal axis (X) of the base and spaced by distances (d1, d2) from the longitudinal axis (X) of the base; the third and fourth radiant element (5, 6) have respective median axes (a5, a6) that extend in the direction of the vertical axis (Z) and intersect the horizontal plane of the base (1) in respective intersection points (P3, P4) disposed on both sides with respect to the longitudinal axis (X) of the base and spaced by respective distances (d3, d4) from the longitudinal axis (X) of the base.