Radar cross section of chiral semi-elliptic-cylindrical boss on a ground plane

2013 ◽  
Author(s):  
A.-K Hamid
Keyword(s):  
Cross Section ◽  
Ground Plane ◽  
Radar Cross Section

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 Radar Cross Section Reduction of Low Profile Fabry-Perot Resonator Antenna Using Checker Board Artificial Magnetic Conductor

2018 ◽  
Vol 7 (2) ◽  
pp. 76-82 ◽  
Author(s):  
V. A. Libi Mol ◽  
C. K. Aanandan
Keyword(s):  
Cross Section ◽  
Ground Plane ◽  
Radar Cross Section ◽  
Bottom Surface ◽  
Board Structure ◽  
Magnetic Conductor ◽  
Artificial Magnetic Conductor ◽  
Low Profile ◽  
Fabry Perot ◽  
Checker Board

This paper presents a novel low profile, high gain Fabry-Perot resonator antenna with reduced radar cross section (RCS). An artificial magnetic conductor which provides zero degree reflection phase at resonant frequency is used as the ground plane of the antenna to obtain the low profile behavior. A checker board structure consisting of two artificial magnetic conductor (AMC) surfaces with antiphase reflection property is used as the superstrate to reduce the RCS. The bottom surface of superstrate is perforated to act as partially reflective surface to enhance the directivity of antenna. The antenna has a 3 dB gain bandwidth from 9.32 GHz to 9.77 GHz with a peak gain of 12.95 dBi at 9.6 GHz. The cavity antenna also has reduced reflectivity with a maximum reduction of 14.5 dB at 9.63 GHz.

Superstrate-based patch antenna array with reduced in-band radar cross section

2021 ◽  
pp. 1-13
Author(s):  
S. K. Vyshnavi Das ◽  
Avinash Singh ◽  
Arti A. Gurap ◽  
Hema Singh
Keyword(s):  
Cross Section ◽  
Ground Plane ◽  
Radar Cross Section ◽  
Band Frequency ◽  
Microstrip Patch ◽  
Rectangular Patch ◽  
High Impedance ◽  
Reflecting Surfaces ◽  
High Impedance Surface ◽  
Array Gain

Abstract To design a low radar cross section (RCS) antenna, the major concern is not only to reduce scattering, but also to maintain its radiation parameters, viz. gain, voltage standing wave ratio (VSWR), etc. This paper presents a simple configuration of low RCS microstrip patch array with a periodic structure-based superstrate. The ground of the array is designed as reduced ground plane with high impedance surface elements, viz. rectangular patch and Jerusalem cross. The configuration of superstrate consists of multilayered, viz., two-layered and three-layered structures having partially absorbing and reflecting surfaces. In both the proposed configurations, the array gain of 12.5 dB is maintained with reduced structural RCS over the entire in-band frequency range. The reflection coefficient (~ −20 dB) and VSWR (~ 1.1) of the array are maintained. It is shown that the proposed superstrate-based patch array design has significantly reduced in-band RCS (−18 dBsm) at its resonant frequency.

Wideband radar cross-section reduction of a microstrip antenna using slots

2018 ◽  
Vol 10 (9) ◽  
pp. 1042-1047 ◽  
Author(s):  
Jiakai Zhang ◽  
Haixiong Li ◽  
Qi Zheng ◽  
Jun Ding ◽  
Chenjiang Guo
Keyword(s):  
Cross Section ◽  
Patch Antenna ◽  
Microstrip Antenna ◽  
Ground Plane ◽  
Radar Cross Section ◽  
Microstrip Patch Antenna ◽  
Current Direction ◽  
Microstrip Patch ◽  
Measurement Results ◽  
Wideband Radar

AbstractIn this study, a new microstrip patch antenna with wideband radar cross-section (RCS) reduction is presented. The RCS of the proposed antenna was reduced by subtracting the current-direction slots of the patch, with the radiation performance sustained not only for the current-direction subtraction, but also for the no modification in the ground plane. Modified and reference antenna were fabricated and measured. The simulation and measurement results showed that the modified antenna reduced the in-band and out-band RCS simultaneously with no detriment to the radiation performance. In the frequency band from 3.9 to 8.1 GHz, the RCS of the modified antenna was reduced in the whole band compared with the RCS of the reference antenna. The maximum RCS reduction was 7 dB at a frequency of 6.7 GHz.

A microstrip antenna with reduced in-band and out-of-band radar cross-section

2018 ◽  
Vol 11 (2) ◽  
pp. 199-205
Author(s):  
Jiakai Zhang ◽  
Jiachen Xu ◽  
Yan Qu ◽  
Jun Ding ◽  
Chenjiang Guo
Keyword(s):  
Cross Section ◽  
Microstrip Antenna ◽  
Ground Plane ◽  
Surface Current ◽  
Radar Cross Section ◽  
Frequency Range ◽  
Band Frequency ◽  
Frequency Bands ◽  
Antenna Surface ◽  
Working Frequency

This paper proposes a microstrip antenna with reduced in-band and out-of-band radar cross-section (RCS) by subtracting the area of weak scattered current on the ground plane. Fourteen square slots were subtracted from the ground plane, reducing in-band and out-of-band RCS while maintaining radiation performance. Modified and reference antenna surface current distributions were simulated and analyzed in radiating and scattering modes. Two antenna prototypes were fabricated and measured to verify the simulation. The proposed antenna RCS was reduced compared with the reference antenna in the frequency range 1–4.4 GHz, including in-band and out-of-band frequency bands. Maximum in-band and out-of-band RCS reduction was 16.3 dBsm at the working frequency, and 19.3 dBsm at 3.4 GHz, respectively

scholarly journals Quarter Wavelength Fabry–Perot Cavity Antenna with Wideband Low Monostatic Radar Cross Section and Off-Broadside Peak Radiation

2021 ◽  
Vol 11 (3) ◽  
pp. 1053
Author(s):  
Hassan Umair ◽  
Tarik Bin Abdul Latef ◽  
Yoshihide Yamada ◽  
Tayyab Hassan ◽  
Wan Nor Liza Binti Wan Mahadi ◽  
...  
Keyword(s):  
Cross Section ◽  
Patch Antenna ◽  
Ground Plane ◽  
Radar Cross Section ◽  
Beam Deflection ◽  
Radiation Beam ◽  
Phase Gradient ◽  
Mesh Structure ◽  
Gain Enhancement ◽  
Fabry Perot

Since antennas are strong radar targets, their radar cross section (RCS) reduction and radiation enhancement is of utmost necessity, particularly for stealth platforms. This work proposes the design of a Fabry–Perot Cavity (FPC) antenna which has wideband low monostatic RCS. While in the transmission mode, not only is gain enhancement achieved, but radiation beam is also deflected in the elevation plane. Moreover, the design is low-profile, i.e., the cavity height is ~λ/4. A patch antenna designed at 6 GHz serves as the excitation source of the cavity constructed between the metallic ground plane and superstrate. The superstrate structure is formed with absorptive frequency selective surface (AFSS) in conjunction with dual-sided partially reflective surface (PRS). Resistor loaded metallic rings serve as the AFSS, while PRS is constructed from inductive gradated mesh structure on one side to realize phase gradient for beam deflection; the other side has fixed capacitive elements. Results show that wideband RCS reduction was achieved from 4–16 GHz, with average RCS reduction of about 8.5 dB over the reference patch antenna. Off-broadside peak radiation at −38° was achieved, with gain approaching ~9.4 dB. Simulation and measurement results are presented.

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