Radar Cross Section Reduction of a Cavity in the Ground Plane

2014 ◽  
Vol 15 (4) ◽  
pp. 895-910 ◽  
Author(s):  
Gang Bao ◽  
Jun Lai
Keyword(s):  
Cross Section ◽  
Ground Plane ◽  
Scattering Problem ◽  
Radar Cross Section ◽  
Optimization Scheme ◽  
Artificial Boundary ◽  
Radar Absorbing Material ◽  
Adjoint State ◽  
Absorbing Material ◽  
Adjoint State Method

AbstractThis paper investigates the reduction of backscatter radar cross section (RCS) for a rectangular cavity embedded in the ground plane. The bottom of the cavity is coated by a thin, multilayered radar absorbing material (RAM) with possibly different permittivities. The objective is to minimize the backscatter RCS by the incidence of a plane wave over a single or a set of incident angles. By formulating the scattering problem as a Helmholtz equation with artificial boundary condition, the gradient with respect to the material permittivities is determined efficiently by the adjoint state method, which is integrated into a nonlinear optimization scheme. Numerical example shows the RCS may be significantly reduced.

scholarly journals DESAIN DAN SIMULASI METAMATERIAL ABSORBER UNTUK APLIKASI RADAR CROSS SECTION REDUCTION

2018 ◽  
Vol 6 (1) ◽  
pp. 38
Author(s):  
Heri Agus Susanto
Keyword(s):  
Cross Section ◽  
Absorption Rate ◽  
Radar Cross Section ◽  
Metamaterial Absorber ◽  
Band 3 ◽  
Radar Absorbing Material ◽  
Absorbing Material ◽  
Tracking Radar ◽  
Triple Band ◽  
Cst Microwave Studio

Adanya suatu permasalahan kendaraan militer pada kapal maritim yang mengalami pendeteksian dan penyerangan dari pesawat tempur karena kapal tersebut terdeteksi oleh adanya radar dari pesawat tempur. Hal ini disebabkan oleh adanya suatu refleksi gelombang elektromagnetik yang mengenai konduktor kapal ketika melakukan tracking radar oleh pesawat. Untuk mengatasi masalah tersebut dapat dilakukan dengan cara mengelabuhi pendeteksian oleh radar pesawat tempur agar tidak dapat melakukan penyerangan ke kapal yaitu menggunakan Radar Absorbing Material (RAM) berupa metamaterial absorber yang diimplementasikan dengan cara melapisi bagian dari body kapal tersebut dengan metamaterial absorber Metamaterial absorber didesain menggunakan perancangan optimum berdasarkan spesifikasi yang telah ditetapkan dan dilakukan simulasi antena dengan menggunakan software CST Microwave Studio 2012. Hasil simulasi metamaterial absorber menunjukkan bahwa metamaterial absorber menghasilkan tiga band (triple band) dari peak S11, dimana band 1 mempunyai nilai S11-parameter -15.547 dB pada frekuensi 8.336 GHz, sehingga menghasilkan nilai absorption rate sebesar 99.92 %. Pada band 2 frekuensi 11.008 GHz mempunyai nilai S11 sebesar -13.278 dB, oleh karena itu menghasilkan nilai absorption rate sebesar 99.78 % dan band 3 dalam frekuensi GHz menghasilkan nilai S11-parameter -8.58 dB pada frekuensi 11.664 GHz, sehingga menghasilkan nilai absorption rate sebesar 98.07 %. Dari hasil simulasi tersebut dapat dikatakan pada tiga band (triple band) dari peak frekuensi mempunyai performansi absorpsi yang baik karena nilai absorption rate lebih besar dari 80 %.

Carbon Nanotubes based composites for electromagnetic absorption- A review

2021 ◽  
Vol 01 ◽  
Author(s):  
Navdeep Singh ◽  
Gagan Deep Aul
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Cross Section ◽  
Radar Cross Section ◽  
Complex Permeability ◽  
Tangent Loss ◽  
Microwave Frequencies ◽  
Radar Absorbing Material ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

: Radar is a delicate detection device and since its evolution different techniques for reducing electromagnetic reflections have been discovered. This paper provide concise review on fundamentals of absorption which reduces radar cross section from stealth target with which radar cross section has effects to survivability and mission capability. The reduction of radar cross section depend on dielectric and magnetic properties of material. The first section reviews the Radar Absorbing Material (RAM) in order to provide a background on fundamentals, various stealth techniques for absorption and its properties at microwave frequencies. The second section reviews the Multi-Walled Carbon Nanotubes and its different composites by encapsulation of other metals, polymers or epoxies into it and its microwave absorption properties were studies at microwave frequencies. Multi-Walled Carbon Nanotubes based composites for microwave absorption are reviewed on the basis of various factors; material composition, reflection loss performance, thickness, complex permittivity, complex permeability, dielectric tangent loss, magnetic tangent loss, bandwidth, and frequency band.

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