Multi-Antenna Radiator Layout for Isolation in Compact Electronics
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Solution Overview
Problem
In electronic devices with multiple antennas, the close proximity leads to mutual interference and poor isolation, reducing transmission efficiency and potentially damaging components like filters.
Innovation Solution
The implementation of a radiator structure with branches and capacitors/matching modules to cancel induced currents, enhancing isolation and efficiency by adjusting impedance matching and current directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple antennas are disposed in close proximity in a limited-size electronic device, then the device can achieve compact form factor and multi-antenna functionality, but mutual interference and poor isolation between antennas occur, reducing transmission efficiency
Solution Approach 1:
The radiator of the first antenna is segmented into a first branch and a second branch, with the second branch positioned between the first branch and the second antenna. This segmentation allows for targeted current control on different branches to improve isolation between antennas while maintaining compact device size.
Solution Approach 2:
A capacitor is introduced as an intermediary component connected between the first branch and the second branch. This capacitor adjusts the current distribution on the branches, enabling better isolation between antennas by controlling the induced currents without requiring increased physical separation.
2Volume of moving object
If multiple antennas are disposed in close proximity, then compact device size is achieved, but electromagnetic interference increases, reducing transmission efficiency
Solution Approach 1:
Different branches of the radiator are treated with different electrical characteristics through selective capacitor connections. The first branch and second branch have different current distributions, creating local quality variations that reduce electromagnetic interference and improve transmission efficiency in the compact antenna arrangement.
3Volume of moving object
If antenna elements are placed close together, then device miniaturization is achieved, but induced currents increase electromagnetic interference
Solution Approach 1:
The electrical parameters of the antenna system are modified by introducing a capacitor that changes the current distribution on the radiator branches. This parameter change reduces the magnitude of induced currents on the first antenna when the second antenna is energized, thereby reducing electromagnetic interference while maintaining compact dimensions.
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
Improves antenna isolation and transmission efficiency, reduces electromagnetic interference, and extends component lifespan while facilitating miniaturization and wide frequency band operation.
Implementation Method 1
The first matching module is connected between the feeding portion and the second branch, and is configured to adjust impedance matching for the first antenna. The first capacitor can adjust impedance matching for the first antenna, so as to adjust a magnitude of the excitation current.
Implementation Method 2
the second antenna located on a periphery of the first antenna excites induced currents on the radiator of the first antenna, and the induced currents on the radiator of the first antenna cause electromagnetic interference to a current on the radiator of the second antenna
Data Source
AI summary
An electronic device includes a radiator of a first antenna and a radiator of a second antenna, the radiator of the first antenna includes a first branch and a second branch, and the second branch is disposed between the first branch and the radiator of the second antenna. A gap is between the first branch and the second branch, and a gap is between the second branch and the radiator of the second antenna. Also included is a first matching module, a first capacitor, and a feeding portion. A first end of the first matching module is connected to the second branch, a second end of the first matching module is connected to the feeding portion, a first end of the first capacitor is connected to the first branch, and a second end of the first capacitor is connected between the first matching module and the feeding portion.