Composite Patch Antenna for Vehicle Windshield Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional stack antennas are not suitable for installation on vehicle windshields due to bandwidth limitations and interference from dielectric materials like glass, and they are not compact enough for modern vehicle designs.
Innovation Solution
A composite patch antenna device is designed with a gap patch antenna and a dielectric patch antenna stacked in an electrically insulated manner, featuring a circuit board with separate feeding sections for different frequency bands, and a dielectric patch antenna with a through-hole configuration to enhance signal reception and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a dielectric patch antenna is used for ETC frequency band, then the antenna can be compact, but the bandwidth and axial ratio are insufficient when attached to glass
Solution Approach 1:
The patent combines a gap patch antenna (for ETC band) and a dielectric patch antenna (for GPS band) into a single stacked structure. The gap patch antenna compensates for the bandwidth and axial ratio deficiencies of the dielectric patch antenna when mounted on glass, while the dielectric patch antenna provides compact size and enables GPS frequency reception. This merging allows the composite antenna to achieve sufficient performance across both frequency bands.
Solution Approach 2:
The patent uses a composite structure consisting of two different antenna types with distinct material properties. The gap patch antenna uses conductive elements with air gap for ETC band, while the dielectric patch antenna uses ceramic or other dielectric materials for GPS band. This composite approach allows each antenna type to发挥 its strengths while compensating for the weaknesses of the other when mounted on glass surfaces.
2Reliability
If multiple antennas are mounted on a vehicle for GPS and ETC functions, then signal reception is ensured, but the attaching area and work complexity increase
Solution Approach 1:
The patent merges multiple antenna functions into a single composite patch antenna device. The stacked structure integrates both the gap patch antenna for ETC band and the dielectric patch antenna for GPS band, allowing both functions to be achieved at one location. This eliminates the need for separate antenna installations and reduces the overall attaching area on the vehicle.
3Reliability
If conventional stack antennas are designed for dashboard installation, then they achieve adequate performance, but they are not suitable for windshield attachment due to dielectric interference
Solution Approach 1:
The patent applies different antenna structures to different frequency bands within the same device. The gap patch antenna is specifically designed to compensate for glass interference effects, making it suitable for windshield attachment. The dielectric patch antenna provides GPS band functionality with compact dimensions. This localized optimization of antenna structures for different frequency bands enables the composite antenna to perform reliably on glass surfaces.
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 composite patch antenna device achieves a wide bandwidth and improved axial ratio characteristics, allowing for compact installation in dashboards or on glass surfaces, enhancing signal reception across multiple frequency bands.
Implementation Method 1
a radiation element that is disposed in parallel with the circuit board with a predetermined air gap with respect to the circuit board, that has a hole section passing through substantially a center of the radiation element, and that constitutes a circularly polarized wave microstrip antenna together with the ground plate of the circuit board
Implementation Method 2
a dielectric patch antenna corresponding to the second frequency band and being stacked on the radiation element of the gap patch antenna in the state of being electrically insulated from the radiation element, the dielectric patch antenna having a dielectric layer, that has a through-hole
Data Source
AI summary
A composite patch antenna composite patch antenna device is capable of receiving signals in multiple frequency bands. The composite patch antenna composite patch antenna device includes a circuit board, a gap patch antenna, and a dielectric patch antenna. The gap patch antenna has a radiation element that is disposed in parallel with a predetermined air gap with respect to the circuit board, that has a hole section passing through substantially a center. The dielectric patch antenna is stacked on the radiation element of the gap patch antenna in the state of being electrically insulated, and has a second feeding line that is connected to the radiation electrode and that is connected to the second feeding section the circuit board by passing through the through-hole of the dielectric layer and the hole section of the radiation element of the gap patch antenna.