Variable Reactance Antenna Decoupling Circuit
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Solution Overview
Problem
Existing antenna devices face challenges in shifting their operating frequency band while maintaining high isolation between radiation elements, which is crucial for efficient MIMO transmission.
Innovation Solution
The antenna device incorporates a decoupling circuit with variable reactance elements and matching circuits to connect radiation elements, allowing for frequency band shifting while maintaining high isolation by adjusting the reactance values and circuit constants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a variable reactance circuit is used as a connection element to reduce coupling between antenna elements, then isolation between radiation elements is improved, but frequency adaptability deteriorates
Solution Approach 1:
The patent applies dynamics by making the reactance elements variable rather than fixed. The reactance elements can be adjusted dynamically to change their reactance values, enabling the antenna device to adapt to different frequency bands while maintaining high isolation between radiation elements through optimized decoupling at each frequency.
Solution Approach 2:
The patent implements parameter changes by varying the reactance values of the reactance elements in the decoupling circuit. By changing the reactance parameters according to the operating frequency band, the antenna device achieves both high isolation and frequency adaptability, resolving the contradiction between fixed isolation performance and frequency flexibility.
2Manufacturing precision
If fixed circuit constants are used in the decoupling circuit, then manufacturing precision is improved, but frequency shifting capability deteriorates
Solution Approach 1:
The patent resolves this contradiction by introducing variable reactance elements that can be adjusted after manufacturing. The fixed structural parameters maintain manufacturing precision, while the adjustable reactance elements provide frequency shifting capability, combining the benefits of both fixed and variable approaches.
Solution Approach 2:
The patent segments the circuit parameters into fixed structural constants (maintained for manufacturing precision) and adjustable reactance elements (providing frequency adaptability). This segmentation allows the antenna device to benefit from precise manufacturing while enabling frequency band shifting through controlled adjustment of specific reactive components.
3Adaptability or versatility
If complex matching circuits are added to achieve impedance matching across frequency bands, then frequency adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the reactance elements to serve multiple functions simultaneously: they provide decoupling between radiation elements and enable impedance matching across different frequency bands. This multi-functionality reduces the need for separate matching circuits, thereby limiting the increase in device complexity while achieving broad frequency adaptability.
Solution Approach 2:
The patent merges the decoupling function and impedance matching function into a single integrated decoupling circuit structure. By combining these functions rather than implementing them as separate circuits, the patent achieves multi-frequency band operation with minimal increase in overall device complexity.
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 configuration enables efficient operation across different frequency bands with reduced transmission coefficients and return losses, facilitating flexible frequency shifting with minimal changes in circuit constants.
Implementation Method 1
a first reactance element provided in series with the first radiation element between the first point and the first radiation element, and a second reactance element provided in series with the second radiation element between the second point and the second radiation element, and at least one of the first reactance element and the second reactance element is capable of changing a value of reactance
Implementation Method 2
each of the first radiation element and the second radiation element may also be configured so as to resonate in a first frequency band and a second frequency band higher than the first frequency band
Data Source
AI summary
In an antenna device, power is fed from a first port to a first radiation element, and power is fed from a second port to a second radiation element. A decoupling circuit connects the first radiation element and the second radiation element, and includes a bridge element connecting a first point between the first port and the first radiation element and a second point between the second port and the second radiation element to each other. A first reactance element is provided in series with the first radiation element between the first point and the first radiation element, and a second reactance element is provided in series with the second radiation element between the second point and the second radiation element. At least one of the first reactance element and the second reactance element is configured so as to be capable of changing the value of reactance.