Shared-Radiator Multi-Antenna Decoupling for Adjacent Frequency Bands
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Solution Overview
Problem
Miniaturized antennas in wireless communication devices experience signal interference due to adjacent frequency operation, reducing communication efficiency.
Innovation Solution
A multi-antenna system with a distributed capacitor in an equivalent circuit formed by a third antenna, which isolates signal coupling between first and second antennas, using a shared radiator and extension branches with a feed configuration to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are built into a terminal to cover wider frequency range, then frequency coverage is improved, but signal coupling between antennas increases
Solution Approach 1:
The patent introduces a decoupling structure as an intermediary element between adjacent antennas. This decoupling structure acts as a mediator that blocks or reduces the electromagnetic coupling between antennas operating on adjacent frequencies, thereby resolving the signal interference problem while maintaining the multi-antenna configuration for wide frequency coverage.
Solution Approach 2:
The patent segments the electromagnetic field interaction between antennas by introducing a decoupling structure that divides the space between antennas. This segmentation prevents the direct coupling of electromagnetic fields between adjacent antennas, allowing each antenna to operate independently on its assigned frequency without interfering with neighboring antennas.
2Volume of moving object
If antenna size is reduced for miniaturization, then device compactness is improved, but frequency range covered by antenna is narrowed
Solution Approach 1:
The patent merges multiple antennas with different frequency coverage capabilities into a single terminal device. By combining multiple miniaturized antennas, each covering specific frequency bands, the system achieves wide overall frequency coverage while maintaining compact antenna sizes. The decoupling structure enables this merging by preventing interference between the combined antennas.
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 system effectively reduces signal coupling and improves communication efficiency by isolating interference between antennas, allowing for wider frequency coverage and enhanced performance.
Implementation Method 1
An equivalent circuit of the spacing includes the distributed capacitor. The distributed capacitor is configured to isolate signal coupling between the first antenna and the second antenna when a first resonant frequency of the first antenna and a second resonant frequency of the second antenna are within a preset frequency range
Implementation Method 2
The third antenna is configured to excite double resonance through feeding by an impedance matching circuit of the third antenna to excite a differential mode and a common mode
Data Source
Figure 1A
Figure 1B
Figure 2~3A
AI summary
This application discloses a multi-antenna system and a wireless communication device. The multi-antenna system is applied to the wireless communication device, and includes a first antenna, a second antenna, and a third antenna disposed at frame positions of the wireless communication device. The third antenna and the first antenna share a first radiator of the first antenna. A first extension branch is close to the second antenna, and a second extension branch is close to the first antenna. A feed of the first antenna is disposed on the first radiator, and a feed of the second antenna is disposed on a second radiator. A feed of the third antenna is disposed at the first extension branch. There is a spacing between the first extension branch and the second extension branch. An equivalent circuit of the spacing includes a distributed capacitor. The distributed capacitor is configured to isolate signal coupling between the first antenna and the second antenna when a first resonant frequency of the first antenna and a second resonant frequency of the second antenna are within a preset frequency range. Therefore, the multi-antenna system can weaken interference between multiple antennas and communication efficiency of the multi-antenna system can be improved.