Vehicle Rooftop Antenna Layout for Compact Multiband Signal Isolation
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Solution Overview
Problem
Vehicle antenna devices face challenges in miniaturization, design, and environmental resistance while requiring improved antenna characteristics, especially when multiple antennas are mounted, with a need for a more efficient arrangement configuration.
Innovation Solution
A vehicle antenna device with a height of 70 mm or less, featuring a first substrate for a GNSS antenna and a second substrate for a SDARS antenna, where the first substrate is positioned higher than the second, optimizing the arrangement to enhance gain and utilization of space, and incorporating a receiving circuit part on the first substrate to demodulate signals from the SDARS antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are mounted in a vehicle antenna device, then communication functionality is improved, but arrangement configuration and space utilization become more difficult
Solution Approach 1:
The patent transitions from planar antenna arrangement to three-dimensional stacked arrangement with multiple substrates at different heights. The first substrate with first patch antenna is positioned at a higher location than the second substrate with second patch antenna, enabling vertical space utilization and resolving the conflict between accommodating multiple antennas and maintaining simple arrangement configuration.
2Length of moving object
If antenna height is reduced for miniaturization, then design requirements are met, but antenna gain and performance deteriorate
Solution Approach 1:
The patent compensates for reduced antenna height by utilizing vertical stacking of multiple substrates at different heights within the accommodating space. This three-dimensional arrangement allows each antenna to maintain optimal electrical characteristics while the overall device height remains 70 mm or less, resolving the contradiction between miniaturization and performance.
3Adaptability or versatility
If multiple antennas are arranged in limited space, then functionality is enhanced, but mutual interference and noise increase
Solution Approach 1:
The patent reduces mutual interference by arranging antennas on separate substrates at different vertical levels within the accommodating space. The first patch antenna on the first substrate and the second patch antenna on the second substrate are spatially separated in the vertical dimension, minimizing electromagnetic coupling and noise interference while maintaining enhanced functionality.
Data Source
AI summary
A multiband vehicle rooftop antenna assembly includes a first cellular antenna configured to be operable over one or more cellular frequencies, a second cellular antenna configured to be operable over one or more cellular frequencies, a first satellite antenna configured to be operable over one or more satellite frequencies, the first satellite antenna configured to be operable for receiving Global Navigation Satellite System (GNSS) signals, a second satellite antenna configured to be operable over one or more satellite frequencies, the second satellite antenna configured to be operable for receiving satellite digital audio radio services (SDARS) signals, and a V2X antenna configured to be operable over Dedicated Short Range Communication (DSRC) frequencies. The first satellite antenna is located between the first cellular antenna and the second cellular antenna. The second cellular antenna is located between the first satellite antenna and the second satellite antenna.