Antenna Damping Element for Surface Wave Interference Reduction
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Solution Overview
Problem
Current antenna systems, such as Controlled Reception Pattern Antennas (CRPA), face interference from surface waves that are not effectively mitigated by existing choke ring structures, resulting in low anti-jamming performance and failure to consider boundary conditions.
Innovation Solution
A device with a damping element that surrounds connecting elements to damp interference from surface waves, featuring ring-shaped or hollow-cylindrical structures and inner/outer choke rings, allowing antenna elements to interact closely while preventing damping between them, thus enhancing anti-jamming performance and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If choke rings are used to reduce interference from surface waves, then interference attenuation is achieved, but anti-jamming performance remains low and boundary conditions are not considered
Solution Approach 1:
The base unit is divided into multiple segments with connecting elements, allowing antenna elements to be arranged in a structured pattern that enables patch structure formation. This segmentation allows the damping element to extend around connecting elements without extending between them, creating zones of damping while preserving antenna interaction pathways.
Solution Approach 2:
The damping element acts as an intermediary structure that selectively dampens interference waves. It is positioned to extend around connecting elements where interference originates, but deliberately not between connecting elements, allowing it to mediate between interference reduction and antenna element interaction requirements.
2Object-affected harmful factors
If a damping element extends around connecting elements to damp interference, then surface wave interference is reduced, but damping between connecting elements must be avoided to maintain antenna interaction
Solution Approach 1:
The damping element is designed with spatially varying presence: it extends around connecting elements where interference waves originate and need damping, but deliberately avoids extending between connecting elements where antenna element interaction occurs. This local differentiation of damping presence allows simultaneous achievement of interference reduction and antenna functionality.
3Reliability
If antenna elements are arranged close together to form a patch structure, then anti-jamming function is enabled, but interference from surface waves increases
Solution Approach 1:
The damping element is nested around the connecting elements in a manner similar to nested dolls. It surrounds the connecting elements that support the antenna elements, creating a protective configuration. The damping element forms concentric or annular structures around the connecting elements, providing interference damping while allowing the nested antenna elements to maintain their close arrangement for patch structure formation.
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 solution effectively reduces multi-path and EMC interference, providing improved anti-jamming capabilities while maintaining optimal antenna function, and is adaptable to CRPA boundary conditions, effectively shielding antenna elements from surface waves.
Implementation Method 1
Electromagnetic surface waves from multipath or reflection signals propagating along the surface of the choke rings are phase shifted by 180° compared to the wave components propagating above the choke rings. This can cause self-cancellation, causing attenuation of the multipath and reflection signals.
Implementation Method 2
The damping element is advantageously designed as a choke filter. The damping element then comprises ring-shaped or hollow-cylindrical structures that extend around the connecting elements. With a choke filter, the effects of the surface wave conduction can be reduced particularly effectively.
Implementation Method 3
The disruptive influences of surface waves are particularly effectively damped by the damping element if the base unit causes shadowing of the interference waves. This reduces multi-path influences or EMC interference with the device.
Data Source
Figure 1
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AI summary
The invention relates to a device for reducing interference in antennas, wherein the device (1) comprises a base unit (14) for attaching antenna elements (11) and an attenuation element (12, 12') for reducing the field strength of surface waves on the base unit (14), wherein the base unit (14) has at least two connecting elements (13) for connecting to at least two antenna elements (11), and wherein the attenuation element (12, 12') is attached to the base unit (14) and extends around the at least two connecting elements (13). The invention thus provides a device (1) that exhibits improved anti-jamming performance while simultaneously offering good interference shielding.