Antenna System With Reflector For Intra-Frequency Interference Cancellation
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Solution Overview
Problem
In full-duplex communication, intra-frequency interference between transmit and receive antennas is a critical issue that existing solutions fail to adequately address without increasing the number of antennas or their distance, leading to inefficiencies in frequency spectrum utilization.
Innovation Solution
An antenna system is proposed that includes a transmit antenna, a receive antenna, and a reflector within a radome, where the signal received by the receive antenna after being reflected by the reflector offsets the intra-frequency interference, achieving phase and amplitude matching to eliminate interference without increasing antenna numbers or distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between transmit and receive antennas is increased to reduce intra-frequency interference, then the isolation between antennas is improved, but the size of the overall antenna system increases
Solution Approach 1:
A reflector is introduced as an intermediary element between the transmit and receive antennas. The reflector redirects the transmitted signal to create a reflected signal path that interferes destructively with the direct interference signal, thereby reducing intra-frequency interference without requiring increased antenna separation distance
Solution Approach 2:
The reflector is positioned and configured to pre-establish a reflected signal path that creates destructive interference with the direct interference signal before the interference reaches the receive antenna. This preliminary anti-action cancels the harmful interference effect without needing to increase physical distance between antennas
2Object-affected harmful factors
If assistance antennas are added to generate offsetting signals to reduce intra-frequency interference, then the isolation between transmit and receive antennas is improved, but the number of antennas increases
Solution Approach 1:
The reflector serves multiple functions: it redirects the transmitted signal to create a reflected path, establishes destructive interference with the direct interference signal, and achieves isolation improvement without requiring additional antenna elements. This multi-functionality resolves the contradiction by eliminating the need for extra assistance antennas
3Volume of moving object
If transmit and receive antennas are placed close together for compact system size, then the volume of the antenna system is reduced, but intra-frequency interference increases
Solution Approach 1:
The reflector acts as a mediator that enables compact antenna placement by creating an artificial interference cancellation mechanism. It redirects signals to establish destructive interference paths, allowing the antennas to be positioned close together without suffering from excessive intra-frequency interference
Solution Approach 2:
The reflector introduces a spatial dimension change by creating indirect signal paths through reflection. This adds reflected signal paths that interfere destructively with direct interference, enabling compact antenna布局 while maintaining isolation through multi-path interference management
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 effectively eliminates intra-frequency interference, enhancing frequency spectrum utilization efficiency by maintaining the existing number of antennas and their spacing, thus improving communication performance.
Implementation Method 1
a signal received by the receive antenna after a transmitted signal of the transmit antenna is reflected by the reflector
Implementation Method 2
the reflector is made by stacking media having different dielectric constants
Implementation Method 3
an amplitude of the signal received by the receive antenna after the transmitted signal of the transmit antenna is reflected by the reflector equals an amplitude of the intra-frequency interference signal generated because the transmitted signal of the transmit antenna is directly received by the receive antenna, and a phase difference is (2n+1)π
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention relates to the communications field, and in particular, to an antenna system. The antenna system includes: a transmit antenna, a receive antenna, a radome above the transmit antenna and the receive antenna, and a reflector within the radome, where a signal received by the receive antenna after a transmitted signal of the transmit antenna is reflected by the reflector offsets an intra-frequency interference signal generated because the transmitted signal of the transmit antenna is directly received by the receive antenna. As a result, according to the embodiments of the present invention, the intra-frequency interference signal of the transmit antenna to the receive antenna may be eliminated without increasing the number of antennas and a distance between antennas.