Multi-Feed Patch Antenna for Wideband Position Accuracy
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Solution Overview
Problem
Existing antennas for vehicles and drones face challenges in achieving high accuracy for position information, particularly in autonomous driving systems, due to limitations in axial ratio and elevation angle coverage across wide frequency bands, leading to inaccuracies in position calculation.
Innovation Solution
The proposed solution involves an antenna design with a patch electrode and circuit substrate, featuring four feeding terminals, phase circuits for signal phase shifting, combining circuits for signal combination, and amplifier circuits, which together enhance the axial ratio and frequency coverage, allowing for improved position accuracy and space efficiency by accommodating multiple frequencies in a single antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas for receiving signals at multiple frequencies are mounted in the same housing, then the position information acquisition accuracy is improved, but the device size becomes large and becomes unsuitable for a vehicle
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated antenna structure. The patch antenna is designed with multiple feeding points that can receive signals at different frequencies (L1 band and L5 band for satellite positioning), eliminating the need for separate antennas for each frequency band while maintaining accurate position information acquisition
Solution Approach 2:
The single patch antenna is designed to perform multiple functions by incorporating multiple feeding points with different impedance values. This allows the same antenna structure to receive signals at multiple frequency bands (including L1, L5, and other satellite positioning frequencies) while also serving as an AM/FM antenna, thereby improving position accuracy without increasing device size
2Area of stationary object
If a single antenna is designed to receive multiple frequencies, then the device size is reduced, but the axial ratio and position accuracy across wide elevation angles and frequencies deteriorate
Solution Approach 1:
The patent applies different impedance values to different feeding points on the patch antenna. Each feeding point is locally optimized with a specific impedance value that enables efficient reception at particular frequency bands. This local differentiation allows the single antenna to maintain good axial ratio and position accuracy across wide elevation angles and multiple frequencies simultaneously
Solution Approach 2:
The patent changes the impedance parameter at different feeding points of the patch antenna. By assigning different impedance values to different feeding points, the antenna can efficiently receive signals at multiple frequency bands while maintaining good axial ratio characteristics across wide elevation angles, thereby achieving both size reduction and position accuracy improvement
Data Source
AI summary
An antenna includes a dielectric, and a patch electrode and a circuit substrate which are mounted on the dielectric, wherein the patch electrode has four feeding terminals, and wherein substrate-side feeding terminals which are electrically continuous respectively with the four feeding terminals in a one-to-one manner, a phase circuit which performs a phase shift for signals output from the substrate-side feeding terminals, a mixing circuit which mixes signals for which the phase shift is performed by the phase circuit, and an amplifier circuit which amplifies signals mixed by the mixing circuit are mounted on the circuit substrate.