Antenna Device with Wilkinson Divider for Multi-Band Filtering
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Solution Overview
Problem
Conventional antenna devices struggle to achieve good axial ratio across multiple frequency bands, particularly when combining different navigation satellite systems like GPS and GLONASS, and require multiple Low Noise Amplifiers for each frequency band, leading to complex circuit configurations.
Innovation Solution
A two-feed patch antenna device with a Wilkinson divider and band-pass filters that receives and filters signals from multiple frequency bands, including L1, L2, and L5 bands of GPS and L6 band of QZSS, simplifying the circuit configuration by using one band-pass filter and amplifier for multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple loop antenna elements are used for different frequency bands, then positioning accuracy is improved, but the circuit configuration becomes complex and axial ratio performance degrades outside limited frequency ranges
Solution Approach 1:
The patent combines multiple frequency band handling capabilities into a single loop antenna element by integrating a Wilkinson divider and multiple band-pass filters within one antenna structure. This merging approach eliminates the need for separate antenna elements for different frequency bands, thereby simplifying the circuit configuration while maintaining the ability to receive signals from multiple frequency bands (L1, L2, L5) for improved positioning accuracy.
Solution Approach 2:
The single loop antenna element is designed to perform multiple functions by incorporating frequency-selective networks that enable it to receive and process signals from multiple frequency bands (GPS L1, L2, L5 and GLONASS L1, L2). This multi-functional design allows one antenna element to replace what would traditionally require multiple separate antenna elements, simplifying the overall circuit configuration while maintaining broad frequency compatibility.
2Adaptability or versatility
If a two-feed patch antenna is used to handle larger bandwidths, then frequency band coverage is improved, but the device size and component count increase
Solution Approach 1:
The patent merges the functionality of multiple feed antennas into a single loop antenna element by integrating frequency-selective networks (Wilkinson divider and band-pass filters) directly within the antenna structure. This consolidation reduces the device size and component count compared to using separate two-feed patch antennas for each frequency band, while maintaining the ability to handle multiple frequency bands through the integrated filtering and signal separation capabilities.
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 antenna device achieves improved positioning accuracy by combining L1, L2, and L5 bands of GPS, enabling centimeter-level positioning and simplifying the circuitry, while allowing reliable filtering of additional frequency bands like L5 or L6, and reducing the device's size and component count.
Implementation Method 1
an antenna unit that receives radio waves of a plurality of first frequency bands and outputs received signals
Implementation Method 2
a first band pass filter that transmits, out of the received signals that are output, received signals of at least two second frequency bands out of the first frequency bands
Data Source
AI summary
An antenna device includes an antenna unit that receives radio waves of a plurality of first frequency bands and outputs received signals, and a first band pass filter that transmits, out of the received signals that are output, received signals of at least two second frequency bands out of the first frequency bands.