Vehicle Antenna Layout for Satellite-Communication Isolation
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Solution Overview
Problem
Securing desired antenna characteristics for both satellite and communication antennas mounted on a common substrate is challenging due to interference between radio waves transmitted/received in different directions, affecting gain and directivity.
Innovation Solution
A vehicle antenna device comprising a dielectric plate with a satellite antenna and a communication antenna positioned below a conductor plate, where the satellite antenna's radiating conductor does not overlap the conductor plate, and a ground conductor is placed between the radiating conductor and the communication antenna to secure isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a satellite antenna and a communication antenna are mounted on one common substrate, then the device complexity is reduced and space is saved, but the antenna characteristics (gain and directivity) deteriorate due to interference between radio waves
Solution Approach 1:
The patent divides the antenna system into distinct spatial zones: the satellite antenna is positioned in the upper region receiving signals from the zenith, while the communication antenna is positioned in the lower region transmitting/receiving signals in horizontal directions. This spatial segmentation prevents radio wave interference between the two antenna types while maintaining integration on a common substrate.
Solution Approach 2:
The patent utilizes vertical dimensionality to resolve interference by positioning antennas at different heights and orientations. The satellite antenna operates in the vertical dimension receiving signals from above, while the communication antenna operates in the horizontal dimension, effectively separating their operational spaces in three-dimensional space.
2Ease of manufacture
If the radiating conductor of the satellite antenna overlaps the conductor plate, then the manufacturing is simplified, but the antenna gain and directivity deteriorate due to radio wave interference
Solution Approach 1:
The patent segments the conductor plate into regions with different functions: a first conductor plate region that does not overlap with the satellite antenna's radiating conductor to minimize interference, and a second conductor plate region that overlaps with the communication antenna. This selective segmentation optimizes both manufacturing and performance.
Solution Approach 2:
The patent applies different conductor plate configurations in different local regions: the first region is designed with minimal overlap to protect satellite antenna performance, while the second region is designed with overlap to enhance communication antenna performance. This local quality differentiation resolves the contradiction between manufacturing simplicity and antenna performance.
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 ensures high gain and desired directivity for both satellite and communication antennas by minimizing interference, allowing for compact and efficient antenna performance.
Implementation Method 1
a dielectric plate attached to a vehicle... receiving radio waves which arrive from a satellite through the dielectric plate
Implementation Method 2
a ground conductor positioned between the radiating conductor and the communication antenna
Data Source
AI summary
To provide a vehicle antenna device which can secure desired antenna characteristics of both a satellite antenna and a communication antenna. A vehicle antenna device comprising a dielectric attached to a vehicle, a conductor plate placed adjacent to the dielectric plate, a satellite antenna disposed below the conductor plate, receiving radio waves which arrive from a satellite through the dielectric plate, and a communication antenna disposed below the satellite antenna, transmitting/receiving radio waves to/from outside the vehicle through the dielectric plate in a horizontal direction, wherein the satellite antenna comprises a radiating conductor which does not overlap the conductor plate from a vertical view, and a ground conductor positioned between the radiating conductor and the communication antenna.