Vehicle Wireless Device Horizontal Polarization Antenna
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Solution Overview
Problem
Existing vehicle wireless devices have limited communication range due to high-frequency radio waves being less likely to wrap around metal vehicle bodies, leading to inaccurate position estimation of mobile devices and increased costs with multiple devices to cover wider areas.
Innovation Solution
A vehicle wireless device with a horizontally polarized wave antenna and a circuit board configuration that avoids a ground portion under the board parallel portion, allowing radio waves to propagate freely and increasing the communication range by positioning the antenna at an electrical distance of λ/4 or more from the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-frequency radio waves are used for wireless communication, then communication speed and data transmission are improved, but the radio waves are less likely to wrap around metal vehicle bodies, limiting communication range and accuracy
Solution Approach 1:
The patent changes the polarization parameter of the radio wave from vertical to horizontal. This parameter change allows the radio waves to better interact with the vehicle body structure and propagate in directions that improve position estimation accuracy while maintaining high-frequency communication speed.
Solution Approach 2:
The patent introduces horizontal polarization as an additional dimension of radio wave propagation characteristics. This enables the system to exploit new propagation paths around the vehicle body, effectively adding spatial diversity to the communication system and improving reliability without sacrificing speed.
2Area of stationary object
If multiple wireless devices are deployed to cover wider communication areas, then communication coverage is improved, but system costs increase
Solution Approach 1:
By changing the polarization parameter to horizontal, a single device achieves broader effective coverage area. This parameter optimization allows one device to perform the function that would otherwise require multiple devices, reducing system complexity and cost while maintaining or expanding coverage.
3Volume of moving object
If the antenna is positioned close to the vehicle body, then device compactness is improved, but radio wave propagation is blocked by the metal body, reducing communication range
Solution Approach 1:
The patent changes the polarization parameter to horizontal, which fundamentally alters how the radio waves interact with the metal vehicle body. This parameter change reduces the blocking effect of the metal body on the antenna, allowing the antenna to be positioned close to the vehicle body while maintaining long communication range.
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 enhances the communication range and reduces the risk of erroneous position estimation by allowing radio waves to propagate in various directions, thereby improving the accuracy and coverage without increasing system costs.
Implementation Method 1
a horizontally polarized wave antenna configured to transmit and receive a board horizontally polarized wave
Data Source
AI summary
A vehicle wireless device is used in a state being attached to an attachment surface of a vehicle. A circuit board includes a circuit that transmits or receives a radio wave at a predetermined target frequency. An antenna includes a board parallel portion parallel to the circuit board to receive a horizontally polarized wave having a vibration direction of an electric field parallel to the circuit board. A case accommodates the circuit board and the antenna. The circuit board faces the attachment surface when the vehicle wireless device is attached to the attachment surface. The circuit board may have a board region overlapping the board parallel portion without a conductor plate being provided in the board region. An inner space of the case may have a case region extending by λ/4 downward from the board parallel portion without a conductor plate being provided in the case region.