Multi-Antenna Decoupling Circuit With Shared Susceptance Resonators
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Solution Overview
Problem
Existing decoupling circuits for multi-antenna systems require a large number of susceptances, leading to increased circuit loss and impedance matrix restrictions, particularly in compact wireless communication devices where antenna spacing is limited.
Innovation Solution
A decoupling circuit design utilizing three susceptance circuits connected in a specific configuration, including parallel resonance circuits and transmission lines, to reduce mutual coupling and reflection with a minimal number of susceptances, allowing for effective impedance matching and reduced restrictions on the antenna configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a decoupling circuit corresponding to one frequency is designed using three susceptances with two matching circuits, then the decoupling circuit can reduce mutual coupling at one frequency, but the number of susceptances increases to nine and circuit loss increases
Solution Approach 1:
The patent combines multiple susceptances into shared components. Specifically, the third susceptance circuit is shared between the first and second parallel resonance circuits, reducing the total number of susceptances from nine to five. This merging approach maintains the decoupling function while reducing circuit loss by eliminating redundant components.
Solution Approach 2:
The decoupling circuit is designed to handle multiple frequency bands using the same set of susceptances. The first and second parallel resonance circuits are configured to operate at different frequencies (first frequency and second frequency respectively), allowing the same circuit structure to provide decoupling across multiple frequency bands without requiring separate matching circuits for each frequency.
2Reliability
If a decoupling circuit corresponding to one frequency is designed using three susceptances with two matching circuits, then the decoupling circuit can reduce mutual coupling at one frequency, but the number of susceptances increases to nine and device complexity increases
Solution Approach 1:
The patent merges the third susceptance circuit as a shared component between the first and second parallel resonance circuits. This reduces the total count of susceptances from nine to five, simplifying the device structure while maintaining the ability to reduce mutual coupling effectively across multiple frequency bands.
Solution Approach 2:
The circuit design uses universal components that serve multiple functions. The first and second parallel resonance circuits share the third susceptance circuit and can operate at different frequencies, reducing device complexity by eliminating the need for separate matching circuits for each frequency band.
3Volume of moving object
If antennas are mounted close together in a compact communication device, then the device size is reduced, but coupling between antennas increases and communication performance deteriorates
Solution Approach 1:
The patent introduces a decoupling circuit as an intermediary between the first and second antennas. This circuit includes susceptance circuits that are connected to the antennas through transmission lines, acting as a mediator to reduce mutual coupling between the closely spaced antennas while allowing them to be mounted in a compact configuration.
Solution Approach 2:
The decoupling circuit changes the electrical parameters (impedance, susceptance) between the antennas to reduce coupling. By adjusting the susceptance values of the first, second, and third susceptance circuits, the circuit transforms the coupling characteristics between antennas, enabling compact antenna placement while maintaining communication performance.
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 proposed decoupling circuit effectively reduces mutual coupling and reflection at one or two frequencies with a smaller number of susceptances, minimizing circuit loss and impedance matrix restrictions, making it suitable for compact multi-antenna systems.
Implementation Method 1
the first susceptance circuit is a first parallel resonance circuit, the second susceptance circuit is a second parallel resonance circuit
Data Source
AI summary
A decoupling circuit includes: a first transmission line whose first end is connected to the first antenna element; a second transmission line whose first end is connected to the second antenna element; a first susceptance circuit whose first end is connected to a second end of the first transmission line; a second susceptance circuit whose first end is connected to a second end of the second transmission line and whose second end is connected to a second end of the first susceptance circuit; a third susceptance circuit whose first end is connected to the second end of the first susceptance circuit and whose second end is connected to the ground conductor; a first input and output terminal connected to the first end of the first susceptance circuit; and a second input and output terminal connected to the first end of the second susceptance circuit.