Multi-Stage Antenna Decoupling Circuit for Broadband Isolation
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Solution Overview
Problem
Full duplex radio (FDR) systems face significant performance degradation due to intra-device self-interference, which needs to be effectively canceled to operate efficiently.
Innovation Solution
An antenna device is designed with a multi-stage decoupling network circuit that electromagnetically connects two antennas to cancel self-interference signals. This circuit consists of multiple single decoupling network circuits cascaded together, with each stage adjusting the Y21 parameter to achieve isolation across a broadband frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single decoupling network circuit is used to cancel self-interference, then the circuit complexity is low, but the isolation performance is insufficient across broadband frequencies
Solution Approach 1:
The decoupling network is divided into multiple stages (first stage, second stage, etc.), where each stage contains separate decoupling circuits for different frequency bands. This segmentation allows independent optimization of each stage for specific frequency ranges, achieving broadband isolation performance while keeping individual stages relatively simple.
Solution Approach 2:
The patent transitions from a single-stage decoupling approach to a multi-stage cascaded architecture, adding the dimension of stage multiplication. Each stage processes different frequency bands, and the cascaded configuration combines their effects to achieve broadband isolation that cannot be obtained by a single circuit.
2Adaptability or versatility
If multiple decoupling network circuits are cascaded to achieve broadband isolation, then the isolation performance improves, but the device complexity increases
Solution Approach 1:
The broadband frequency range is segmented into multiple sub-bands, with each decoupling stage targeting specific frequency ranges. This segmentation allows the system to achieve broadband adaptability by combining narrowband solutions, while each individual stage remains relatively simple in structure.
Solution Approach 2:
The cascaded multi-stage decoupling network serves multiple functions simultaneously: each stage provides decoupling for its designated frequency band, and the combination of all stages provides broadband isolation. This multi-functionality achieves versatile broadband performance without requiring a completely different circuit architecture for each frequency band.
3Reliability
If decoupling circuits are added to cancel self-interference signals, then the signal cancellation performance improves, but the manufacturing complexity increases
Solution Approach 1:
The decoupling network is segmented into multiple independent stages that can be designed, fabricated, and tested separately. Each stage targets specific frequency bands and can be manufactured using standard PCB techniques, reducing overall manufacturing complexity compared to designing a single complex broadband circuit.
Solution Approach 2:
The patent employs decoupling circuits with adjustable parameters (such as variable capacitors or inductors) that allow post-manufacturing tuning and optimization. This dynamic adjustability enables fine-tuning of each stage to achieve optimal self-interference cancellation without requiring perfect initial manufacturing precision.
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 multi-stage decoupling network circuit effectively cancels self-interference signals, enhancing isolation between antennas in FDR systems and maintaining performance across a wide frequency band.
Implementation Method 1
a plurality of single decoupling network circuits DN_1 to DN_n for electromagnetically connecting the first antenna and the second antenna to cancel a self-interference signal
Data Source
AI summary
An antenna device comprises: a first antenna; a second antenna; and a plurality of single decoupling network circuits DN_1-DN_n which electromagnetically connect the first antenna and second antenna and remove a self-interference signal, wherein a multi-stage decoupling network circuit in which the DN_1-DN_n are dependent-connected can be configured such that a Y21 parameter of the multi-stage decoupling network circuit becomes equal to or lower than a predetermined value on frequencies f_1-f_n, respectively.