Checkerboard EBG Surfaces for Wideband Radar Cross Section Reduction
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Solution Overview
Problem
Conventional methods for reducing radar cross section (RCS) are limited in achieving wide-band frequency reduction, as they either rely on shape modification or radar absorbing materials, which have drawbacks in effectiveness and applicability.
Innovation Solution
The use of electromagnetic band gap (EBG) structured checkerboard surfaces with dual-band EBG structures, including square and circular loops surrounding patches, arranged in quadrants to achieve out-of-phase reflections at specific frequencies, thereby broadening the RCS reduction bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional shape modification or radar absorbing material is used to reduce RCS, then RCS reduction is achieved, but the frequency bandwidth is limited
Solution Approach 1:
The checkerboard surface is divided into four quadrants, with each quadrant containing a different EBG structure type (first and second structures in alternating quadrants). This segmentation allows each quadrant to resonate at different frequencies, collectively providing wide-band RCS reduction across multiple frequency ranges.
Solution Approach 2:
The patent combines multiple types of EBG structures (square loops with square patches, circular loops with circular patches) within a single checkerboard surface. These composite EBG structures with different resonant frequencies work together to achieve dual-band and wide-band RCS reduction, overcoming the frequency limitation of single-structure designs.
2Object-affected harmful factors
If single-band EBG structures are used, then RCS reduction is achieved at specific frequencies, but the bandwidth is narrow
Solution Approach 1:
The checkerboard is divided into four quadrants with different EBG structures in each quadrant. This segmentation enables each quadrant to target specific frequency bands, achieving dual-band and wide-band RCS reduction while maintaining a relatively simple overall structure that is easier to manufacture than more complex multi-layer or three-dimensional EBG designs.
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 EBG checkerboard surfaces demonstrate a significant -10 dB RCS reduction over dual-band frequency bandwidths, achieving over 61% and 24% reduction, with improved resonant frequency optimization and field redirection, outperforming traditional designs in bistatic and monostatic RCS patterns.
Implementation Method 1
a first resonant frequency and a second resonant frequency... a third resonant frequency and a fourth resonant frequency
Implementation Method 2
The fields reflected by the first dual-band electromagnetic band gap structures are out-of-phase from fields reflected by the second dual-band electromagnetic band gap structures
Data Source
AI summary
An electromagnetic band gap checkerboard surface including a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant. The first and third quadrants each include a multiplicity of first dual-band electromagnetic band gap structures having a first resonant frequency and a second resonant frequency. The second and fourth quadrants each include a multiplicity of second dual-band electromagnetic band gap structure having a third resonant frequency and a fourth resonant frequency. The first quadrant is directly adjacent to the second quadrant and the fourth quadrant; the third quadrant is directly adjacent to the second quadrant and the fourth quadrant; the first quadrant and the third quadrant are diagonally juxtaposed; and the second quadrant and the fourth quadrant are diagonally juxtaposed.