Multiple Feed Point Antenna Harmonic Resonance Directivity
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Solution Overview
Problem
Existing antennas face challenges in achieving high gain, directivity, and bandwidth, particularly in frequency bands with high path losses and oxygen absorption, such as the 60 GHz band, where traditional antennas trade off between these characteristics.
Innovation Solution
The development of a multiple feed point antenna with feed points positioned at locations corresponding to current maxima of harmonic resonance frequencies, allowing constructive combination of radiation patterns to enhance gain, directivity, and bandwidth, and the ability to steer the beam pattern by adjusting the phase between feeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a phased array of multiple individual antennas is used to achieve high directivity, then directivity is improved, but device size and structural complexity increase significantly
Solution Approach 1:
The patent combines multiple feed points into a single antenna structure, merging the functions of multiple antennas into one integrated element. The antenna includes a radiating element with multiple feed points positioned at specific locations, allowing it to achieve high directivity through constructive combination of radiation patterns without requiring multiple separate antenna elements and their associated support structures.
Solution Approach 2:
The patent segments the radiating element into multiple functional zones corresponding to different harmonic resonance frequencies, with each feed point positioned at a current maximum location for a specific harmonic. This segmentation allows independent excitation of different harmonic modes while maintaining a single integrated antenna structure, achieving high directivity without the complexity of a phased array.
2Stability of the object's composition
If antenna size is increased to achieve higher gain and directivity, then gain and directivity are improved, but the antenna becomes unsuitable for mobile wireless communications due to size constraints
Solution Approach 1:
The patent changes the operating parameters by utilizing harmonic resonance frequencies (multiples of the fundamental frequency) and positioning feed points at specific locations corresponding to current maxima for each harmonic. This parameter change allows the antenna to achieve high gain and directivity characteristics typically associated with larger antennas, while maintaining a compact size suitable for mobile devices through resonant frequency exploitation.
3Reliability
If a resonant antenna is designed for a specific frequency, then impedance match is improved at that frequency, but bandwidth is reduced and the antenna cannot operate effectively over a range of frequencies
Solution Approach 1:
The patent makes the antenna multi-functional by incorporating multiple feed points that can excite different harmonic resonance modes. Each feed point is positioned to correspond to a current maximum for a specific harmonic frequency, allowing the antenna to operate effectively across multiple frequency bands. This universal design enables the same antenna structure to maintain good impedance match at multiple frequencies, achieving both reliability at specific frequencies and adaptability across a broad bandwidth.
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
This solution provides a 29% improvement in directivity, 28.5% improvement in realized gain, and 120% improvement in bandwidth compared to single feed point antennas, while maintaining or increasing main lobe magnitude and bandwidth, and allowing for steerable beam patterns.
Implementation Method 1
a radiating element configured to have a fundamental resonance frequency being regarded as a first harmonic resonance frequency fo
Data Source
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AI summary
An antenna, including a radiating element configured to have a fundamental resonance frequency being regarded as a first harmonic resonance frequency fo, and feed points positioned on the configured radiating element at selected multiple locations that correspond to where a multiple of the first harmonic resonance frequency have current maxima, wherein feeds at the feed points cooperate at an operating frequency of the antenna to constructively combine their respective antenna radiation patterns.