Array Antenna Parasitic Element Isolation
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Solution Overview
Problem
Existing array antenna apparatuses for mobile communication struggle with insufficient isolation between feeding elements and inability to operate in multiple frequency bands, particularly in small-sized devices like mobile phones, while maintaining a simple configuration.
Innovation Solution
An array antenna apparatus is designed with a parasitic element that is capacitively coupled to the feeding elements, allowing independent resonance in higher frequency bands and forming a loop antenna in lower frequency bands, thereby eliminating mutual coupling and enabling MIMO communication across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple feeding elements are placed close together in small-sized devices, then the device size is reduced, but the isolation between feeding elements becomes insufficient
Solution Approach 1:
A parasitic element is introduced as an intermediary component between the feeding elements. This parasitic element is capacitively coupled to the feeding elements and serves to eliminate electromagnetic mutual coupling between them, thereby improving isolation without increasing the distance between feeding elements
Solution Approach 2:
The patent utilizes frequency-dependent parameter changes in the parasitic element. At higher frequencies, the parasitic element eliminates mutual coupling through capacitive coupling. At lower frequencies, the same parasitic element forms a loop antenna structure that enables resonance, allowing the system to operate in multiple frequency bands with maintained isolation
2Productivity
If multiple antenna elements are added to achieve MIMO communication, then communication capacity is improved, but the device structure becomes more complex
Solution Approach 1:
The parasitic element serves multiple functions: it eliminates mutual coupling between feeding elements at higher frequencies and forms a loop antenna for lower frequency operation. This multi-functionality allows the antenna apparatus to achieve MIMO capability and multi-band operation without proportionally increasing structural complexity
Solution Approach 2:
The patent combines the functions of mutual coupling elimination and loop antenna formation into a single parasitic element structure, rather than using separate components for each function, thereby reducing overall structural complexity
3Length of moving object
If feeding elements are placed closer together, then the antenna apparatus fits in smaller devices, but electromagnetic mutual coupling between feeding elements increases
Solution Approach 1:
The parasitic element acts as a mediator that is capacitively coupled to both feeding elements. Through this intermediary connection, the parasitic element eliminates the direct electromagnetic mutual coupling between the closely-spaced feeding elements, allowing them to be placed closer together without harmful coupling effects
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 ensures sufficient isolation between feeding elements in higher frequency bands for MIMO communication and allows operation in lower frequency bands without increasing the number of feeding elements, enhancing communication capabilities in multiple frequency bands while maintaining a simple configuration.
Implementation Method 1
a first parasitic element electrically connected to the respective first and second feeding elements
Implementation Method 2
by eliminating electromagnetic mutual coupling between the first and second feeding elements
Implementation Method 3
a loop antenna having a certain electrical length is formed by the first and second feeding elements and the first parasitic element, and a resonance of the loop antenna substantially occurs
Data Source
AI summary
An array antenna apparatus includes a first feeding element having a first feed point, a second feeding element having a second feed point, and a first parasitic element electrically connected to the respective first and second feeding elements. In a first frequency band, respective resonances in the feeding elements occur independent of each other, by eliminating electromagnetic mutual coupling between the feeding elements, and exciting the first feeding element through the first feed point as well as exciting the second feeding element through the second feed point. In a second frequency band lower than the first frequency band, a loop antenna having a certain electrical length is formed by the first and second feeding elements and the first parasitic element, and a resonance of the loop antenna substantially occurs by exciting the first feeding element through the first feed point.