Active Radar Cross Section Reduction of an Object Using Microstrip Antennas

Sengupta, Sohini; Jackson, David R.; Onofrei, Daniel

doi:10.1029/2019rs006939

Cited by 14 publications

(6 citation statements)

References 35 publications

(32 reference statements)

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“…Table 3 shows the calculated FoM for the same rectangular chirped pulse as in Section 3.1. The FoM values for the chirped rectangular pulse are given for a 50% patch bandwidth using both a CAD method and HFSS with a homogeneous substrate (as explained in [17]), for cases with 6 3 6 resistors and 6 3 6 resistors with two resistors removed near the feed (''w/o 2'').…”

Section: Figure Of Meritmentioning

confidence: 99%

“…In the method discussed here, introduced in [17], a time-varying radar signal that is reflected from a fixed object is cancelled by radiation from a patch antenna that is placed on the object. In order to increase the bandwidth of the patch antenna [18,19], and thus effectively counter wider-band incident signals, a resistor-loaded patch is used.…”

Section: Introductionmentioning

confidence: 99%

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Radar Cross-Section Reduction of an Arbitrary Object Using a Resistor-Loaded Patch

2021

RSL

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Various methods exist for reducing the radar cross section (RCS) of an object. Using radarabsorbent materials or selective sculpting can reduce an object's RCS. Another method is active cancellation, where a source is put on the object to emit a countersignal that interferes with and therefore partially cancels the object-scattered signal (e.g., coming from a radar signal). The study presented here uses a microstrip antenna put on the surface of an object. Microstrip antennas with a bandwidth larger than the bandwidth of the incident radar signal are useful for this purpose. To increase the bandwidth of the patch antenna, a resistor loading approach is presented here. For a wide variety of incident signals in the suggested frequency band, RCS reduction can be achieved using such an antenna. Applications include the reduction of electromagnetic interference, a topic of considerable importance in an environment of ever-increasing spectrum congestion.

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Section: Figure Of Meritmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radar Cross-Section Reduction of an Arbitrary Object Using a Resistor-Loaded Patch

2021

RSL

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“…Therefore, it is important to obtain the dimensions of that area and calculate the amount of the reflected energy. Moreover, RCS is the area intercepting the amount of energy, which, if radiated isotropically, produces the same received energy in the radar [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Implementation of radar cross-sections model for targets with different scattering centers

Aziez

Hamza

Al-Nuaimy

et al. 2022

EEJET

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Target scattering or reflection is used by radar systems to identify and detect targets. The larger the echo that was returned to the radar receiver, the superior the signal-to-noise ratio and the greater the likelihood of detection. The radar cross-section (RCS) determines the quantity of energy reflected from a target in radar systems. This work shows new modeling for radar targets with growing stages of fidelity. We introduce the RCS concept for straightforward point targets and extend this into additional complex states of targets with several scattering midpoints. In addition, we discuss the modeling of fluctuations in RCS with time and briefly consider the case of the polarized signal. Because the receiver and transmitter are co-located, the effort focuses on narrowband mono-static radar techniques. The RCS value changes between scans. We simulate the replicated power of a sent signal over 10,000 scanning over unit incident signals, assuming that the signal illuminates the target just once each dwell. The target is modeled by four scatterers that are placed at four square vertices. All scatterers are cylindrical-point targets on a 0.5-meter square XY plane without losing generality. The acquired results demonstrated how to generate target echoes while accounting for statistical fluctuations. From the relation between RCS and elevation angle variations for cylindrical targets, the obtained result demonstrated that the first two outputs are the same and confirmed that there is no reliance on azimuth angle. The comparison between wideband and narrowband RCS patterns demonstrated that the RCS profiles of the target-matched shallower nulls for azimuth direction are in the range of (40–50) degrees at zero elevation for 4 scatterers’ extended targets.

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“…A number of RCS reduction (RCSR) techniques are employed which are broadly classified as active RCSR and passive RCSR [1]. Active RCSR techniques involve cancelling the radar echoes suitably at the target by employing active devices [2]. One of the passive techniques used to reduce the RCS of a target is the distributed loading [3].…”

Section: Introductionmentioning

confidence: 99%

Resonance Based Discrimination of Stealth Targets Coated With Radar Absorbing Material (Ram)

Anuradha¹,

Balakrishnan²

2021

PIER M

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For the first time, a real sized complex target that is coated with an absorber material is discriminated from the uncoated one using an aspect independent discrimination method based on natural resonances. This resonance based technique provides a real-time, accurate and aspect independent solution for stealth target discrimination. First, the discrimination is studied for a complex shaped aircraft of electrical size 1.5λ. The Perfectly Electrically Conducting (PEC) target is coated uniformly with sintered nickel-zinc-ferrite, a magnetic Radar Absorbing Material (RAM) with complex dielectric and magnetic properties. The resonant range Radar Cross Section (RCS) of the aircraft for different coating thicknesses is computed using the Method of Moments (MoM). The resonances contained in the RCS are extracted using the vector fitting method, and the dominant resonances representing the target are determined by applying the power criteria. The variation in the pole placements with the increasing coating thickness is also studied. A one number quantifier of discrimination -"Risk" in dB is defined to express the amount of mismatch between the compared targets. Further, the discrimination technique is also studied for an aircraft of electrical length, 7λ. A Risk value of 2 dB and more is obtained in this study at all aspects. This demonstrates the capability of the algorithm to discriminate between targets of identical structure but with different material compositions.

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Active Radar Cross Section Reduction of an Object Using Microstrip Antennas

Cited by 14 publications

References 35 publications

Radar Cross-Section Reduction of an Arbitrary Object Using a Resistor-Loaded Patch

Radar Cross-Section Reduction of an Arbitrary Object Using a Resistor-Loaded Patch

Implementation of radar cross-sections model for targets with different scattering centers

Resonance Based Discrimination of Stealth Targets Coated With Radar Absorbing Material (Ram)

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