Tunable thin radar absorber using artificial magnetic ground plane with variable backplane

Simms, S.; Fusco, Vincent

doi:10.1049/el:20061989

Cited by 49 publications

(30 citation statements)

References 3 publications

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“…1 [9], [10], [13], [21]. The mushroom structure is typically characterized by a periodic array of metal patches, connected to the ground plane by vertical conducting vias through a dielectric thin layer [27].…”

Section: A Thin Absorber Based On An Ebg Structurementioning

confidence: 99%

“…Here the so-called mushroom-type EBG structure is used as the high-impedance surface, which has an array of metallic patches connected to the ground plane by thin vias [27]. When the patches on the surface are interconnected by "lumped resistors" (matched with the free space impedance of 377 Ω), the incident RF power is absorbed by them at the resonance frequency where the EBG structure exhibits a high-impedance feature [9], [10], [13], [21]. We propose to directly measure the power consumed by each of the lumped resistors, which is equivalent to the amount of incident RF power absorbed by that resistor.…”

Section: Introductionmentioning

confidence: 99%

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Imaging Radio-Frequency Power Distributions by an EBG Absorber

Yagitani

Keigo

Nojima

et al. 2011

IEICE Trans. Commun.

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SUMMARYA thin electromagnetic band-gap (EBG) absorber is employed to capture the 2-d image of radio-frequency (RF) power distribution. The EBG absorber consists of an array of mushroom unit cells formed on a thin dielectric substrate with a metal backplane, and lumped resistors interconnecting the surface patches of the mushrooms. Around the resonance frequency at which the EBG structure acts as a high-impedance surface, the RF power incident on the surface is absorbed by the lumped resistors which are matched with the incident wave impedance. By detecting directly the amounts of power consumed by the individual resistors, an "RF power imager" can be constructed which captures the 2-d distribution of the RF power illuminating the EBG surface, where polarization discrimination is possible. The resonance (i.e., absorption) frequency is made tunable by adding varactor diodes in parallel with the lumped resistors. The EBG absorber tunable in the frequency range of 700 MHz-2.7 GHz is designed and fabricated, and its performance is evaluated by an equivalent-circuit analysis, simulation and measurement. It is shown that the small resistance of the varactors have a considerable effect on the absorption performance. RF power distributions radiated from a dipole antenna are successfully measured by a matrix of sensitive power detectors installed on the backside of the absorber. Using such an RF power imager, the power distributions of even impulsive RF signals and/or noises can be captured and visualized in situ and in real-time, while the electromagnetic environment is almost undisturbed by the EBG absorber.

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Section: A Thin Absorber Based On An Ebg Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Imaging Radio-Frequency Power Distributions by an EBG Absorber

Yagitani

Keigo

Nojima

et al. 2011

IEICE Trans. Commun.

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“…6 Finally, another study presents an absorber consisting of an artificial magnetic ground plane with surface mount resistors interconnecting a textured surface of square patches. 7 Researchers have developed mechanical and electrical tuning methods for tunable AMCs (or high impedance surfaces) by adjusting the resonant frequency of the unit cell. For example, incorporating varactor diodes into the resonant unit cell of the periodic surface texture produces a tunable impedance surface.…”

Section: Introductionmentioning

confidence: 99%

Reflection characteristics of a composite planar AMC surface

Hwang

Tsai

2012

AIP Advances

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This study investigates the reflection characteristics of a composite Artificial Magnetic Conductor (AMC) surface consisting of multiple orthogonal gradient AMC surfaces arranged in a two-dimensional periodic pattern. The gradient AMC surface in this study consists of square metal patches of variable size printed on a grounded dielectric substrate. Due to the orthogonal placement of the gradient AMC surface, the incident energy of a plane wave normally incident on the composite AMC surface will be reflected into four major lobes away from the impinging direction. To achieve a systematical design, a simple formula based on array antenna theory was developed to determine the reflection pattern of the gradient AMC surface illuminated by a normal incident plane wave. A time-domain full-wave simulation was also carried out to calculate the electromagnetic fields in the structure and the far-field patterns. The scattering patterns of the structure were measured in an electromagnetic anechoic chamber. Results confirm the design principle and procedures in this research. Since such a composite AMC surface can be easily fabricated using the standard printed circuit board technique without via-hole process, it may have potential applications in beam-steering and radar cross section reduction

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“…This λ/4 height limitation makes the Salisbury screen very bulky at low frequencies. In [6][7][8], AMC surfaces, which utilize lossy material, have been used to reduce backscatter from the screen. Another way of using AMC surfaces to control the electromagnetic (EM) scattering from targets is based on shaping.…”

Section: Introductionmentioning

confidence: 99%

A Polarization-Dependent Mutiband Ram Design

Xü¹,

Cao²,

Gao³

et al. 2012

PIER Letters

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Abstract-A polarization-dependent mutiband radar absorbing material (PDM-RAM) composed of polarization-dependent multiband AMC (PDMAMC) and perfect electric conductor (PEC) cells is proposed. The PDMAMC is realized by etching a complementary split ring resonator (CSRR) on the patch of a conventional AMC. Around the two/three operational frequencies of the PDMAMC-elements for different electric field polarizations, the reflections of the PDMAMC and PEC have opposite phases, so for any normal incident plane wave the reflections cancel out. The basic principle is discussed, and a sample is measured. The results show that the proposed method is feasible and effective for the polarization-dependent multiband radar cross section (RCS) reduction.

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Tunable thin radar absorber using artificial magnetic ground plane with variable backplane

Cited by 49 publications

References 3 publications

Imaging Radio-Frequency Power Distributions by an EBG Absorber

Imaging Radio-Frequency Power Distributions by an EBG Absorber

Reflection characteristics of a composite planar AMC surface

A Polarization-Dependent Mutiband Ram Design

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