Radiation-Coupled Antenna Network for Vehicle Decoupling
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Solution Overview
Problem
In vehicle antenna systems, densely packed antennas experience significant electromagnetic coupling due to their proximity, leading to increased bit error rates during digital signal transmission, particularly in mobile radio systems like LTE, which affects the economic efficiency and compact design requirements.
Innovation Solution
The antenna system employs two mutually radiation-coupled antennas with a decoupling network formed from dummy elements, where the electrical conductors are designed to create a coupled electrical line with specific impedance and angle properties, reducing coupling between network and antenna connection ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If antennas are positioned close together to reduce space usage, then area utilization is improved, but electromagnetic coupling between antennas increases causing bit error rate to worsen
Solution Approach 1:
A decoupling network is introduced as an intermediary component between the two antennas. This network includes dummy elements with antenna paths that are electromagnetically coupled to the respective antennas but isolated from direct signal connections. The dummy elements act as mediators that absorb and redirect electromagnetic energy, reducing the harmful coupling between antennas while maintaining compact spacing.
Solution Approach 2:
The harmful electromagnetic coupling effect is extracted and redirected into separate dummy antenna paths. By providing alternative electromagnetic pathways through the dummy elements, the interfering energy is taken out from the direct antenna-to-antenna coupling path and dissipated or redirected away from the signal transmission paths.
2Reliability
If a decoupling network is added to reduce electromagnetic coupling, then bit error rate is improved, but device complexity increases
Solution Approach 1:
The decoupling network parameters, particularly the impedance values of the dummy elements and their coupling coefficients, are optimized to achieve effective decoupling. By carefully selecting these parameters, the network achieves the required bit error rate performance with minimal additional complexity. The parameter optimization allows the system to reach decoupling effectiveness with a relatively simple network structure rather than requiring complex multi-element arrangements.
3Shape
If compact antenna design is implemented for vehicle mounting, then aerodynamic shape and wind resistance are improved, but manufacturing cost increases due to specialized production requirements
Solution Approach 1:
The decoupling network is merged with the antenna assembly as an integrated unit. The dummy elements are positioned and coupled to the antennas in a way that allows the entire assembly to be manufactured as a single integrated component or pre-assembled module. This merging approach enables standard manufacturing processes to be used for the complete antenna system with decoupling functionality, avoiding the need for specialized production lines or post-assembly calibration procedures.
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
This design significantly reduces electromagnetic coupling between antennas, improving bit error rates and enabling a compact, economically efficient manufacturing process for vehicle-mounted antenna systems across various communication standards.
Implementation Method 1
two identical, mutually radiation-coupled, symmetrically arranged antennas 1a, 1b
Implementation Method 2
The characteristic impedance ZLp and the electrical angle αp present when the coupled electrical line 15 is excited in the same direction, as well as the characteristic impedance ZLn and the electrical angle αn present when the coupled electrical line 15 is excited in opposite directions, are designed such that at at least one frequency f1, the coupling S4a4b existing between the network connection ports 4a, 4b is significantly smaller
Data Source
Figure 1a~1b
Figure 1c
Figure 2a~2b
AI summary
This invention relates to an antenna system with two identical, mutually radiation-coupled, symmetrically arranged antennas, each with an antenna connection port, and a network formed from dummy elements connected to the antenna connection ports on the input side, each with an identical antenna path to a network connection port, separately assigned to one antenna.