Adjustable Decoupling Structure for MIMO Antenna Isolation
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Solution Overview
Problem
Conventional MIMO antennas face challenges in achieving high isolation between multiple antenna units operating in different frequency bands due to mutual coupling, especially in compact terminal devices, where existing neutralization methods are limited to specific frequency bands and require different neutralization line lengths for frequency changes.
Innovation Solution
A MIMO antenna with an adjustable decoupling structure, comprising series capacitors and parallel inductors, connected in symmetric circuits, allowing for adjustable matching networks and controlled by a controller to adjust frequency bands and decouple antennas across different operating frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas are concentrated in small space to increase throughput rate, then productivity is improved, but mutual coupling increases causing antenna isolation to deteriorate
Solution Approach 1:
A neutralization line is introduced as an intermediary element connected between two antenna units. This neutralization line carries coupling currents that neutralize the mutual coupling between antennas, thereby improving antenna isolation while maintaining the compact multi-antenna configuration needed for high throughput rate
2Object-affected harmful factors
If a neutralization line is used to improve antenna isolation, then antenna isolation is improved, but the solution is limited to specific frequency bands requiring different neutralization line lengths for frequency changes
Solution Approach 1:
The neutralization line is designed with adjustable parameters (such as variable capacitors or inductors) that allow its electrical characteristics to be dynamically changed. This enables the neutralization line to adapt to different frequency bands by adjusting its length or impedance, maintaining effective coupling neutralization across multiple frequency ranges rather than being limited to a single fixed frequency
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 adjustable decoupling structure effectively isolates antennas operating in various frequency bands, enhancing decoupling performance and meeting design requirements for isolation, even at higher frequencies, by absorbing interference energy and providing adjustable resonance frequencies.
Implementation Method 1
an adjustable decoupling structure, disposed between the first antenna and the second antenna, and configured to reduce coupling between the first antenna and the second antenna
Implementation Method 2
the adjustable decoupling structure includes a first adjustable capacitor and a second adjustable capacitor that are connected in series and a first adjustable inductor and a second adjustable inductor that are connected in parallel
Data Source
AI summary
A MIMO antenna is disclosed, including: a first antenna, a second antenna, and an adjustable decoupling structure. The adjustable decoupling structure is disposed between the first antenna and the second antenna, and is configured to reduce coupling between the first antenna and the second antenna. The adjustable decoupling structure includes a first adjustable capacitor and a second adjustable capacitor that are connected in series and a first adjustable inductor and a second adjustable inductor that are connected in parallel.