Antenna Decoupling Network for Array Coupling Control
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Solution Overview
Problem
Array antennas face challenges with mutual coupling, leading to distorted radiation patterns, impedance mismatch, and reduced gain due to strong coupling between antenna units, which existing decoupling methods fail to precisely control and define.
Innovation Solution
The introduction of a decoupling network and transmission line system, where the length of the decoupling transmission line is determined based on the initial isolation degree and scattering parameters of the antenna units, allowing for precise control of coupling between antenna units, forming a power divider to offset mutual coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If array antennas are used to improve radiation performance and directivity, then radiation gain and flexibility are improved, but mutual coupling between antenna units causes distorted radiation patterns and impedance mismatch
Solution Approach 1:
A decoupling network is introduced as an intermediary component between adjacent antenna units to manage and control the mutual coupling effects. The decoupling network includes transmission lines with specifically determined lengths that act as mediators to offset the harmful coupling between antenna elements, thereby maintaining radiation pattern integrity while preserving array antenna gain benefits
Solution Approach 2:
The lengths of transmission lines in the decoupling network are precisely determined based on scattering parameters and initial isolation degrees. By changing the physical parameters (lengths) of the decoupling components, the system optimizes the cancellation of mutual coupling effects across different operating frequencies and scanning angles
2Adaptability or versatility
If antenna units are arranged in array to improve directivity, then radiation performance is improved, but strong coupling between units causes impedance mismatch
Solution Approach 1:
The decoupling network serves as an intermediary impedance transformation structure between antenna units. By carefully designing the transmission line lengths within the decoupling network, the system provides automatic impedance matching that simplifies the overall design while maintaining adaptability for directional control in array antenna configurations
3Ease of operation
If existing decoupling methods are used, then some coupling reduction is achieved, but precise control and definition of coupling is not possible
Solution Approach 1:
The design methodology incorporates scattering parameters and initial isolation degree measurements as feedback mechanisms. These parameters are used to calculate and determine the optimal transmission line lengths in the decoupling network, enabling precise control of coupling effects while providing clear manufacturing specifications for accurate implementation
Solution Approach 2:
The initial isolation degree is determined and used as a preliminary parameter before final decoupling structure fabrication. This preliminary characterization allows the system to be optimized in advance with calculated transmission line lengths that will achieve the desired coupling cancellation, ensuring both operational precision and manufacturing accuracy
Data Source
AI summary
Provided are an antenna apparatus and an electronic device. The antenna apparatus comprises a plurality of antenna units, spaced from each other; a plurality of decoupling networks, corresponding to the plurality of antenna units one to one; and a decoupling transmission line. Each of the decoupling networks comprises a first transmission line and a second transmission line; an end of the first transmission line is configured to be connected to a radio-frequency chip, the other end of the first transmission line is connected to an end of the second transmission line, a decoupling port is formed at a joint between the other end of the first transmission line and the end of the second transmission line, and the other end of the second transmission line is connected to a corresponding antenna unit; and the decoupling transmission lines is connected between adjacent decoupling ports. The electronic device comprises the antenna apparatus.