Broadband Patch Antenna Grooves for Full-Duplex Isolation
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Solution Overview
Problem
Full-duplex radio systems face significant performance deterioration due to intra-device self-interference, which current technologies struggle to effectively cancel, especially in broadband communication scenarios.
Innovation Solution
A broadband patch antenna design is introduced, featuring a substrate, a ground plate with specific grooves, and a radiation plate, where the grooves enhance polarization isolation by generating right or left-handed circular polarization, improving self-interference signal cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex radio transmission is implemented, then system capacity is doubled, but intra-device self-interference significantly deteriorates performance
Solution Approach 1:
The antenna is divided into separate transmit and receive ports with distinct radiation plates and feed lines, allowing independent optimization of each port's characteristics to minimize mutual interference while maintaining full-duplex operation
Solution Approach 2:
The ground plate features non-uniform groove distributions at different locations - first and second grooves near transmit port connections, third grooves near receive port connections - creating localized polarization control to improve isolation between transmit and receive paths
2Reliability
If polarization isolation is improved using grooves in the ground plate, then self-interference cancellation is enhanced, but device complexity increases
Solution Approach 1:
The ground plate employs asymmetric groove patterns - first grooves and second grooves positioned differently from third grooves - to create distinct polarization characteristics for transmit and receive ports, improving isolation without requiring complex additional components
Solution Approach 2:
The solution addresses isolation issues by introducing polarization diversity through groove-induced circular polarization, adding a dimensional approach (polarization domain) rather than relying solely on spatial separation
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 design significantly improves polarization isolation and self-interference cancellation, enabling more efficient operation of full-duplex radio systems by effectively reducing unwanted signal interference across ports.
Implementation Method 1
the third groove may be located in a portion of the ground plate which generates right handed circular polarization (RHCP) when a vertical polarization signal is input to the radiation plate through the feed line
Implementation Method 2
a broadband patch antenna for improving isolation between ports in order to remove a self-interference signal in a system supporting full duplex radio (FDR)
Data Source
AI summary
A broadband patch antenna comprises a substrate, a ground plate attached to one surface of the substrate, a radiation plate attached to the other surface of the substrate opposite the one surface of the substrate, and a feed line attached to the other surface of the substrate and having one end connected to the radiation plate. The feed line comprises a first line and a second line. The ground plate has the shape of capital “L” having a first groove, a second groove, and a third groove, and may not comprise a portion corresponding to the radiation plate. The first groove is positioned at a first portion which corresponds to a connection portion between the first line and the radiation plate, the second groove is positioned at a second portion which corresponds to a connection portion between the second line and the radiation plate, and the third groove may be positioned so as to be spaced apart from the first groove and the second groove.