Bent Inverted-F GNSS Antenna Layout for Multi-Band Circular Polarization
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Solution Overview
Problem
Current GNSS systems lack efficient antennas capable of receiving signals in multiple frequency bands, particularly L1 and L2/L5, and do not effectively utilize bent antennas, which can provide better frequency selectivity, and often struggle with circular polarization, leading to inaccuracies in navigation, especially in compact and integrated systems like UAVs.
Innovation Solution
A GNSS antenna system utilizing eight inverted F-antennas, with four oriented for L1 and four for L2/L5 frequency bands, including bent antennas, sharing a common ground plane, and employing quadrifilar 4-phased antenna feeders for quadrature phasing to achieve right-handed circular polarization, with adjustable distances and phasing to optimize radiation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bent antennas are used instead of straight antennas, then frequency selectivity is improved, but radiation behavior deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the inverted F-antenna by introducing bends at specific locations along the antenna element. The bend angles and positions are carefully controlled to achieve frequency selectivity while maintaining acceptable radiation characteristics through parameter optimization
Solution Approach 2:
The patent applies curvature to the traditionally straight antenna element by introducing controlled bends in the antenna structure. This curvature modification enables frequency selective reception while the bend geometry is optimized to preserve radiation performance
2Adaptability or versatility
If multiple frequency bands are received, then versatility is improved, but device complexity increases
Solution Approach 1:
The patent designs the inverted F-antenna structure to serve multiple frequency bands (L1, L2, and L5) simultaneously. By configuring the antenna dimensions and ground plane parameters, a single antenna type can receive signals across multiple GNSS frequency bands, eliminating the need for separate antennas for each band
Solution Approach 2:
The patent combines multiple reception functions into a unified antenna system. Four inverted F-antennas are arranged together with shared ground plane and feeding structure to handle multiple frequency bands, reducing the overall system complexity compared to using separate antennas for each band
3Volume of moving object
If compact antenna design is implemented, then space utilization is improved, but manufacturing precision requirements increase
Solution Approach 1:
The bent antenna design allows the antenna elements to be folded into a compact configuration that fits within limited space. The curvature is designed to achieve compactness while the bend locations are positioned at accessible points for manufacturing
Solution Approach 2:
The patent optimizes the antenna parameters including element lengths, widths, spacing, and bend angles to achieve compact dimensions. These parameters are carefully calculated to maintain electrical performance while minimizing physical size, with tolerance considerations built into the design
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 system provides a compact and efficient GNSS antenna solution with improved frequency selectivity and circular polarization, enhancing navigation accuracy by minimizing multipath signal reception errors and accommodating tight space constraints in UAVs.
Implementation Method 1
employing quadrifilar 4-phased antenna feeders for quadrature phasing to achieve right-handed circular polarization
Implementation Method 2
at least one inverted F-antenna configured to receive GNSS signals in the L1 frequency band, and at least one inverted F-antenna configured to receive GNSS signals in the L2/L5 frequency band
Data Source
AI summary
A GNSS antenna system for receiving GNSS signals in the L1 and L2/L5 frequency band, and to an unmanned aerial vehicle (UAV) comprising the GNSS antenna system.