Antenna Isolation Element Segmentation for Communication Devices
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Solution Overview
Problem
Conventional antenna systems in communication devices face a challenge in maintaining radiation efficiency while improving isolation between antennas, as conventional isolation elements can become parasitic radiation elements, reducing overall efficiency.
Innovation Solution
A communication device design featuring an isolation element with a first and second portion, both equivalent to resonators when in resonance, is disposed between antennas to enhance isolation while maintaining original radiation efficiency by capturing coupling currents and acting as extensions of the ground element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional isolation elements are disposed between antennas to improve isolation, then antenna isolation is improved, but radiation efficiency decreases due to parasitic radiation
Solution Approach 1:
The isolation element is divided into two separate portions (first portion and second portion) that are respectively coupled to the ground element. Each portion acts as an independent resonator, and they are spaced apart by a coupling distance. This segmentation prevents the formation of a continuous parasitic radiation path while maintaining isolation functionality.
Solution Approach 2:
The ground element serves as an intermediary component that couples both portions of the isolation element. By connecting to the ground element, the isolation element captures coupling currents without forming a closed loop that would act as a parasitic radiator, thus maintaining radiation efficiency while achieving isolation.
2Volume of moving object
If antennas are spaced close to each other to save internal space, then device compactness is improved, but antenna isolation deteriorates
Solution Approach 1:
The isolation element acts as an intermediary structure placed between the closely-spaced antennas. It captures the coupling currents that would otherwise cause interference, enabling compact antenna spacing while maintaining adequate isolation performance.
Solution Approach 2:
The isolation element's dimensions and positioning are optimized to resonate at specific frequencies, changing the electromagnetic parameters in the space between antennas. This allows compact spacing while maintaining isolation through resonant cancellation of 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 effectively improves antenna isolation by up to 10dB in both communication bands while maintaining radiation efficiency above 87% and 93% in the first and second communication bands respectively, ensuring high performance without compromising radiation efficiency.
Implementation Method 1
A first portion and a second portion of the isolation element are respectively equivalent to a resonator when the first portion and the second portion are respectively in a condition of resonance
Implementation Method 2
a first end of the first portion and a first end of the second portion are respectively coupled to the ground element
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A communication device including a first antenna, a second antenna, a ground element, and an isolation element is provided. The ground element is coupled to a conductive plane. The isolation element is disposed between the first antenna and the second antenna and includes a first portion and a second portion. A first end of the first portion and a first end of the second portion are respectively coupled to the ground element, and a second end of the first portion is spaced apart a coupling distance from a second end of the second portion.