Collinear Antenna Layout With Orthogonal Polarization Isolation
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Solution Overview
Problem
Conventional antenna systems face challenges in achieving high electromagnetic isolation between multiple antennas while maintaining small dimensions, leading to significant crosstalk and noise interference, particularly in applications requiring simultaneous transmission and reception at similar wavelengths.
Innovation Solution
The antenna system employs collinearly arranged antenna modules with mutually orthogonal polarizations and a minimal distance apart, utilizing parasitic antenna circuits and induced current suppression techniques to reduce electromagnetic coupling, achieving isolation of about -45 to -50 dB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between antennas is increased to reduce electromagnetic coupling, then isolation between antennas is improved, but the dimensions of the antenna system increase
Solution Approach 1:
Parasitic antenna circuits are introduced as intermediary elements between the active antennas. These parasitic circuits couple electromagnetically to the active antennas and create opposing phase signals that cancel the coupled interference, achieving high isolation without increasing physical separation distance between antennas
2Reliability
If electromagnetic radiation shields are used to reduce coupling between antennas, then isolation is improved, but the weight and dimensions of the system increase
Solution Approach 1:
Instead of using physical radiation shields, the patent employs parasitic antenna circuits as electromagnetic intermediaries. These circuits actively cancel coupled signals through phase opposition, achieving the same isolation effect without the weight and bulk of conventional electromagnetic shielding materials
Solution Approach 2:
The patent changes the approach from passive physical barriers to active electromagnetic parameter control. By adjusting the coupling and phase relationships between parasitic and active antennas, high isolation is achieved through electromagnetic parameter optimization rather than physical dimension increases
3Productivity
If multiple antennas operate at similar wavelengths simultaneously, then communication efficiency is improved, but crosstalk and noise interference increase
Solution Approach 1:
The patent converts the harmful electromagnetic coupling between simultaneous antennas into a beneficial effect. By introducing parasitic antennas that couple to both active antennas, the system creates opposing phase signals that cancel the harmful interference, allowing simultaneous operation at similar wavelengths with high signal-to-noise ratios
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 suppresses electromagnetic coupling between antennas, allowing for high signal-to-noise ratios and wide azimuthal coverage with reduced system size and weight, enabling efficient simultaneous transmission and reception at similar wavelengths.
Implementation Method 1
Various antenna systems utilize multiple antenna elements to transmit and/or receive electromagnetic signals simultaneously
Implementation Method 2
EM coupling between nearby antenna elements (locally adjacent antennas) is dictated by several factors such as the distance between the antenna elements/modules and their spatial performance
Implementation Method 3
each two locally adjacent antenna modules of said at least two antenna modules operate with substantially mutually orthogonal polarizations of radiation, thereby suppressing EM coupling between the antenna modules
Implementation Method 4
The antenna system employs collinearly arranged antenna modules with mutually orthogonal polarizations and a minimal distance apart, utilizing parasitic antenna circuits and induced current suppression techniques to reduce electromagnetic coupling
Data Source
Figure 1A
Figure 1B~1C
Figure 2A~2B
AI summary
The present invention relates to an antenna system including at least two antenna modules operable for transmitting and/or receiving radiation in certain common frequency band. The at least two antenna modules are collinearly arranged along a common axis so as to provide low gain along the axis, and are spaced apart from one another along this axis by a distance of at least a few nominal wavelengths of the common frequency band. Each two locally adjacent antenna modules of the at least two antenna modules operate with substantially mutually orthogonal polarizations of radiation, thereby suppressing electromagnetic coupling between the antenna modules in the common frequency band.