Antenna Matching Circuit for MIMO SISO Mode Switching
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Solution Overview
Problem
In electronic devices, the performance of antennas deteriorates when switching from MIMO to SISO mode due to the influence of co-located antennas, leading to inefficient signal transmission and reception.
Innovation Solution
The use of a second antenna radiator with a matching circuit that is mismatched in the first frequency band during SISO mode to prevent interference and maintain efficiency, and matched in the second frequency band during MIMO mode to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second antenna radiator is added for MIMO mode, then MIMO performance is improved, but SISO mode performance deteriorates due to interference from the second antenna
Solution Approach 1:
The matching circuit is designed to dynamically change its impedance characteristics based on the operating mode. In MIMO mode, the circuit is matched to both antenna radiators for optimal performance, while in SISO mode, the circuit is deliberately mismatched with respect to the second antenna radiator to prevent it from receiving or transmitting signals, thereby eliminating interference with the first antenna radiator
Solution Approach 2:
The invention changes the electrical parameters (impedance) of the matching circuit depending on the operating mode. By adjusting the matching circuit's impedance to be mismatched with the second antenna radiator in SISO mode, the system prevents the second antenna from being excited, thus avoiding its harmful influence on the first antenna while maintaining proper matching in MIMO mode
2Productivity
If the second antenna radiator is matched in the first frequency band, then MIMO signal transmission is improved, but the first antenna radiator's efficiency deteriorates in SISO mode
Solution Approach 1:
The matching circuit's impedance is dynamically adjusted based on the operating mode requirement. For MIMO operation in the first frequency band, the circuit is configured to be matched with both antenna radiators to enable simultaneous signal transmission. For SISO operation, the circuit is configured to be mismatched with the second antenna radiator, effectively isolating it and preventing interference with the first antenna radiator
Solution Approach 2:
The invention utilizes parameter changes in the matching circuit's impedance characteristics to achieve mode-dependent performance. By changing the matching circuit's electrical parameters, the system achieves proper matching for MIMO mode while creating intentional mismatch for SISO mode, thereby controlling the second antenna radiator's participation in signal transmission based on operational requirements
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
This solution prevents performance deterioration in SISO mode by isolating the first antenna radiator from the second antenna radiator's influence, ensuring high efficiency in both MIMO and SISO modes by adjusting the matching circuit's impedance accordingly.
Implementation Method 1
a matching circuit electrically connected to the second antenna radiator, wherein the matching circuit is mismatched with the second antenna radiator in the first frequency band and is matched with the second antenna radiator in the second frequency band
Data Source
AI summary
An electronic device includes a first antenna radiator configured to transmit or receive a signal of a first frequency band and a signal of a second frequency band, a second antenna radiator configured to transmit or receive the signal of the second frequency band, a matching circuit mismatched with the second antenna radiator in the first frequency band and matched with the second antenna radiator in the second frequency band, a radio frequency circuit electrically connected to the first antenna radiator and the second antenna radiator, and a processor configured to control the RF circuit such that the signal of the second frequency band is transmitted or received through the first antenna radiator and the second antenna radiator in a multi-input multi-output mode or such that the signal of the first frequency band is transmitted or received through the first antenna radiator in a single input single output mode.