Self-Interference Cancellation via Antenna Polarization Isolation
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Solution Overview
Problem
Existing self-interference cancellation devices for wireless communication have large volumes and high costs, making them unsuitable for small mobile communication terminals.
Innovation Solution
A self-interference signal cancellation device comprising a power divider, a self-interference signal reconstruction circuit, a combiner, a transmit antenna, and a receive antenna, with separate arrangement and polarization isolation between the antennas, reducing the need for complex circuits and replacing the circulator, resulting in a smaller and more cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing self-interference cancellation devices are designed for base stations with high performance requirements, then self-interference cancellation effectiveness is improved, but device volume and cost increase excessively
Solution Approach 1:
The patent extracts and removes the circulator component from the traditional self-interference cancellation device, retaining only the essential power divider, reconstruction circuit, and combiner. This extraction principle reduces device volume while maintaining core cancellation functionality suitable for mobile terminals.
Solution Approach 2:
The patent applies polarization isolation specifically at the antenna level with transmit and receive antennas positioned at different locations and orientations. This localized application of isolation techniques achieves effective self-interference cancellation without requiring complex circuitry throughout the entire device, thus reducing overall volume.
2Reliability
If existing self-interference cancellation devices are designed for base stations with high performance requirements, then self-interference cancellation effectiveness is improved, but device cost increases excessively
Solution Approach 1:
By removing the expensive circulator component and using simpler, more cost-effective elements like power dividers and combiners with standard antennas, the patent significantly reduces manufacturing cost while maintaining adequate self-interference cancellation performance for mobile terminal applications.
Solution Approach 2:
The patent employs standard, commercially available components such as power dividers, phase shifters, and antennas that are inexpensive and widely manufactured, rather than specialized high-cost components required in base station equipment, making the solution economically viable for mobile terminals.
3Reliability
If existing self-interference cancellation devices are designed for base stations with high performance requirements, then self-interference cancellation effectiveness is improved, but circuit scale becomes overlarge
Solution Approach 1:
The patent simplifies the circuit architecture by extracting and removing the circulator, leaving only the essential power divider, self-interference signal reconstruction circuit with attenuator and phase shifter, and combiner. This reduced circuit scale is appropriate for mobile terminal integration.
Solution Approach 2:
The patent segments the self-interference cancellation function into distinct modular components: power divider for signal splitting, reconstruction circuit with attenuator and phase shifter for signal manipulation, and combiner for signal combination. This modular segmentation simplifies the overall circuit design and facilitates integration into mobile terminals.
4Object-affected harmful factors
If transmit antenna and receive antenna are arranged at different positions with polarization isolation, then antenna isolation is improved, but device space requirements increase
Solution Approach 1:
The patent applies polarization isolation specifically at the antenna level with transmit and receive antennas positioned at different locations and orientations. This localized application of isolation techniques achieves effective self-interference cancellation without requiring excessive space, as the isolation is concentrated at the critical antenna interfaces rather than requiring large separation distances throughout the device.
Data Source
AI summary
A self-interference signal cancellation device and method are disclosed. A power divider divides a signal source into two paths, with one being connected to a transmit antenna and the other being connected to an input end of a self-interference signal reconstruction circuit. An output end of the self-interference signal reconstruction circuit is connected to a first input end of a combiner. An output end of a receive antenna is connected to a second input end of the combiner and a feedback regulating end of the self-interference signal reconstruction circuit, respectively. The transmit antenna and the receive antenna are arranged at different positions. According to the self-interference signal cancellation device of the present invention, by means of polarization isolation and separate arrangement between the transmit antenna and the receive antenna, high isolation between the antennas can be achieved, thereby reducing requirements for simulation elimination.