Antenna Tuning Stub Layout for Same-Band Isolation
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Solution Overview
Problem
Existing communication devices face interference between communication modules with the same frequency due to insufficient isolation between antennas, exacerbated by metals, printed circuit boards, and other components, leading to suboptimal performance.
Innovation Solution
An antenna system with a tuning stub that adjusts the equivalent current path of antennas, aligning the connection lines and polarization directions to reduce interference by making them more perpendicular, using a tuning stub connected to the radiation arms and adjusting the equivalent current paths to enhance isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If specific isolation is required between antennas of communication systems with the same frequency, then interference between systems is reduced, but device complexity increases due to the need for additional isolation structures and components
Solution Approach 1:
The patent changes the orientation parameter of the tuning stub relative to the antenna element. By adjusting the angle between the tuning stub and the antenna element (optimal angle between 0-90 degrees), the equivalent current path orientation is modified, which changes the polarization direction and improves isolation between antennas with the same frequency, achieving better performance without adding complex isolation structures
2Object-affected harmful factors
If higher isolation between antennas is achieved through existing design solutions, then communication system performance is improved, but actual isolation cannot reach high levels due to impact of metals, PCB, radio frequency cables, power cables, and other components
Solution Approach 1:
The patent modifies the orientation parameter of the tuning stub (angle with antenna element between 0-90 degrees) to change the equivalent current path orientation. This parameter change makes the equivalent current path more perpendicular to the connection line between maximum equivalent current points of different antennas, improving isolation by up to 15 dB and effectively reducing interference from metals, PCB, and cables
Solution Approach 2:
The patent introduces a可调 (adjustable) tuning stub that can be configured at different angles relative to the antenna element. This dynamic adjustment capability allows optimization of the equivalent current path orientation to achieve maximum isolation performance, with the optimal angle being between 0-90 degrees, thereby overcoming the limitations of fixed existing designs
3Object-affected harmful factors
If the equivalent current path of the first antenna is adjusted to be more perpendicular to the second antenna, then isolation between antennas is improved, but the structure of the antenna system becomes more complex
Solution Approach 1:
The patent achieves the goal of making the equivalent current path more perpendicular to the connection line between maximum equivalent current points by changing the orientation parameter of the tuning stub. By adjusting the angle between the tuning stub and the antenna element to be between 0-90 degrees, the equivalent current path orientation is optimized, improving isolation by up to 15 dB while maintaining a relatively simple antenna structure without requiring complex additional components
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 tuning stub improves antenna isolation by up to 15 dB, reducing interference and maintaining antenna efficiency, with the equivalent current paths becoming more perpendicular, thus enhancing the overall performance of the communication system.
Implementation Method 1
the tuning stub is configured to adjust an equivalent current path of the first antenna
Data Source
AI summary
An antenna system includes a first antenna, a second antenna, and a tuning stub, where the first antenna and the second antenna have a same first operating frequency band or similar first operating frequency bands. The tuning stub is electrically connected to the first antenna, and the tuning stub is configured to adjust an equivalent current path of the first antenna, so that a connection line between a projection point of a maximum equivalent current point of the first antenna and a projection point of a maximum equivalent current point of the second antenna on a first plane tends to be more perpendicular to a projection of the equivalent current path of the first antenna or of the second antenna on the first plane; or the equivalent current path of the first antenna and of the second antenna tend to be more perpendicular to each other.