Vehicle MIMO Antenna Layout Using Orthogonal Polarization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle antenna systems using MIMO technology do not adequately enhance communication capacity, particularly in frequency bands like 4G LTE/5G, quasi-millimeter waves, and millimeter waves.
Innovation Solution
A vehicle-mounted MIMO antenna system with four antennas, including two pairs of antennas that transmit and receive orthogonal polarized waves, are dispersedly arranged across the vehicle, with specific configurations involving central and peripheral regions to optimize antenna placement and reduce interference, enhancing communication capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MIMO antenna is mounted on vehicle to enable high-speed communication, then communication infrastructure capability is improved, but communication capacity is insufficient
Solution Approach 1:
The patent divides the vehicle into multiple spatial regions (central region, first peripheral region, second peripheral region, front region, rear region) and strategically places antennas in different regions to achieve spatial diversity. This segmentation of space allows the system to overcome the limitation of single-location antennas and improve overall communication capacity through multi-region signal reception.
Solution Approach 2:
The patent transitions from conventional single-polarization antennas to dual-polarization antennas that can transmit and receive both first polarized waves and second polarized waves orthogonal to each other. This dimensional change in polarization space effectively doubles the communication capacity without adding more physical antenna locations.
2Reliability
If antennas are dispersedly arranged to improve signal reception, then spatial coverage is improved, but antenna placement complexity increases
Solution Approach 1:
The patent assigns different functional roles to different spatial regions: the central region (defined by center line and equidistant widths) is optimized for certain antenna placements while peripheral regions serve other purposes. This local quality differentiation simplifies the design process by providing clear placement guidelines for each region rather than requiring complex optimization across the entire vehicle.
Solution Approach 2:
The patent employs asymmetric polarization configurations where one antenna transmits/receives first polarized waves and another transmits/receives second polarized waves orthogonal to the first. This asymmetric polarization arrangement simplifies the overall system design while achieving diverse signal reception across different polarization dimensions.
3Productivity
If dual-polarized antennas are used to increase communication capacity, then data transmission capability is improved, but interference between polarized waves may increase
Solution Approach 1:
The patent converts the potential harmful interference between orthogonal polarized waves into a beneficial feature by utilizing polarization diversity. The orthogonal polarization relationship naturally separates the signal spaces of different antennas, allowing the system to achieve frequency and spatial diversity while minimizing mutual interference through proper spatial arrangement in different vehicle regions.
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 proposed antenna system significantly improves communication capacity by compensating for low communication capacity in one polarized wave signal with another, ensuring stability and increasing overall communication performance.
Implementation Method 1
a first antenna that mainly transmits and receives a first polarized wave and a second antenna that mainly transmits and receives a second polarized wave orthogonal to the first polarized wave
Data Source
AI summary
An antenna system for vehicle includes a vehicle and a MIMO antenna that is mounted on the vehicle and that transmits and receives radio waves of a predetermined frequency. The MIMO antenna includes antennas including a first antenna that mainly transmits and receives a first polarized wave and a second antenna that mainly transmits and receives a second polarized wave orthogonal to the first polarized wave, and the antennas are dispersedly arranged on the vehicle. One of the first antenna and the second antenna are arranged based on at least one of (1) a configuration in which one is arranged in a central region and another one is arranged in a first peripheral region or a second peripheral region and (2) a configuration in which one is arranged in a first region and another one is arranged in a second region.