Curved Rod Shielding for Phased Array Antenna Protection
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Solution Overview
Problem
Conventional mechanical protection methods for phased array antennas, such as metal shields and Frequency Selective Surfaces, interfere with electromagnetic wave transmission and are not effective in preventing damage from threats.
Innovation Solution
A shield comprising a plurality of rods made from electrical conducting materials, arranged in parallel with curved transverse cross-sections, providing mechanical protection while allowing electromagnetic wave transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal shield is used for mechanical protection, then the antenna is protected from damage, but the transmission of electromagnetic waves is blocked
Solution Approach 1:
The shield is segmented into multiple thin rods arranged in parallel, spaced apart from each other. This segmentation allows electromagnetic waves to pass through the gaps between rods while the collective structure provides mechanical protection. The rod width is specifically controlled to be below 1/20th of the wavelength, and spacing is optimized to maintain both protection and transmission capabilities.
Solution Approach 2:
Different regions of the shield have different properties: the rods provide mechanical strength and threat protection, while the gaps between rods allow electromagnetic wave transmission. The curved transverse cross-section of each rod is designed with specific dimensions (width below 1/20th wavelength, depth significantly less than width) to optimize local electromagnetic interaction while maintaining mechanical integrity.
2Loss of energy
If conventional polarizing filters with thin metal strips are used, then electromagnetic wave polarization is achieved, but mechanical protection capability is insufficient
Solution Approach 1:
The metal strips are replaced with rods having curved transverse cross-sections (circular, egg-shaped, or elliptical). This curvature provides several advantages: enhanced mechanical strength compared to flat strips, improved aerodynamic characteristics, and maintained electromagnetic compatibility. The curved geometry allows the rods to better withstand mechanical threats while preserving the electromagnetic wave transmission properties through proper dimensional control.
3Reliability
If Frequency Selective Surfaces are used, then radar radome protection is achieved, but the solution is unsuitable for phased array antennas
Solution Approach 1:
The invention changes key parameters from conventional FSS designs: using three-dimensional rods with curved cross-sections instead of two-dimensional patterns, controlling rod width to be below 1/20th of wavelength, and optimizing spacing between rods. These parameter changes make the shield compatible with phased array antenna requirements while maintaining protection capabilities, enabling both mechanical protection and electromagnetic wave transmission necessary for phased array operation.
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 shield effectively protects phased array antennas from potential damage while maintaining electromagnetic wave transmission and reception capabilities.
Implementation Method 1
the rods being in parallel spatial relationship one to another, the rods each having a respective curved transverse cross-section... providing mechanical protection while allowing electromagnetic wave transmission
Data Source
AI summary
A shield is provided for an antenna, the shield including a plurality of rods, each rod having at least an external surface made from an electrical conducting material, the rods being in parallel spatially spaced relationship one to another, the rods each having a respective curved transverse cross-section. Also provided is an antenna installation, including an antenna and such a shield. The antenna has a forward antenna face for emitting and/or receiving electromagnetic radiation. The shield is spaced forward of the forward antenna face by a forward spacing.