Improvement in the Low Frequency Performance of Geometric Transition Radar Absorbers Using Square Loop Impedance Layers

Ford, K.L.; Chambers, B.

doi:10.1109/tap.2007.913086

Cited by 16 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the quest for a thin and broadband absorber, a number of researchers in academia and industry have investigated various FSS layers fabricated over traditional dielectric substrates like FR4 and Teflon [13], [16]. The incorporation of microwave absorbing material (MAM) instead of a traditional dielectric substrate can open a new door for researchers [17].…”

Section: Introductionmentioning

confidence: 99%

Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

Panwar

Puthucheri

Agarwala

et al. 2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

The development of thin microwave absorber coatings that operates for a wide range of frequencies is still a challenging task. This work presents a technique of blending a fractal frequency selective surface (FSS) with single-and double-layer coatings. These coatings are comprised of well-optimized micrometer-sized (80-90 m) and nano-sized (20-30 nm) Ti particles based Fe O (80-100 nm) composites. The main objective of this study is to achieve good absorption with wide bandwidth corresponding to reflection loss (RL) dB for less coating thickness ( 1.5 mm). Waveguide measurements are carried out to obtain the effective complex dielectric permittivity ( ) and effective complex magnetic permeability ( ) values of Fe O -Ti based heterogeneous composites. The measured , , , and values are used for the designing of double-layer composite absorbers, where the suitable composite selection, layer preferences, as well as thickness of layers are optimized using a genetic algorithm. The fractal geometry based FSSs have been designed using an iterated function system, which are embedded with single-and double-layer composite absorbers to examine their effect on absorption. A double-layer composite coating with a Sierpinski gasket fractal FSS shows a strong RL of 35.57 dB at 9.5 GHz with broad bandwidth of 4.2 GHz in the range from 8.2 to 12.4 GHz. The total coating thickness is only 1.4 mm. Findings provide an effective and feasible way to develop thin and broadband absorber coatings for various practical applications. Index Terms-Composite materials, fractals, frequency-selective surfaces (FSSs), microwave absorbing materials (MAMs).

show abstract

Section: Introductionmentioning

confidence: 99%

Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

Panwar

Puthucheri

Agarwala

et al. 2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…FSS have found wide use in various applications, not only radar antennas; but also to absorb an incident radiation and hence reduce the radar cross section of a target [18,19]; to provide a reflective surface for beam focusing in reflector antenna system [20][21][22] or to enhance array antenna performances [23].…”

Section: Introductionmentioning

confidence: 99%

A Physical Optics Approach to the Analysis of Large Frequency Selective Radomes

D'Elia¹,

Pelosi²,

Pichot³

et al. 2013

PIER

View full text Add to dashboard Cite

Abstract-State-of-the-art radomes exploit frequency selective media so as to be transparent for the frequencies of the antenna protected by them and opaque to other frequencies. This feature helps in reducing the radar cross section of the antenna and in protecting it from interference. The study of a frequency selective radome is a daunting task, since the radome is usually large in terms of wavelengths, hence full wave analyses are prohibitive. In this paper an approximate technique, based on the physical optics concept, is proposed to attain an estimation of the behavior of a radome shielded antenna in a short time with a commonly available computer. Results are validated against a full wave technique over a relatively small radome.

show abstract

“…Currently, the most widely used broadband anechoic absorbers are made out of carbon impregnated polyurethane (PU) foam in pyramidal, wedge, and in convoluted shapes [3]. Although frequency selective surfaces (FSS) have been studied [4,5], to improve the low frequency performance of these absorbers however, ferrite tiles are still preferred.…”

Section: Introductionmentioning

confidence: 99%

A Simple Technique for Improving the Anechoic Performance of a Pyramidal Absorber

Iqbal¹,

Malek²,

Lee³

et al. 2013

PIER M

View full text Add to dashboard Cite

In this paper, we propose a very simple technique that offers an extra degree of freedom to optimize the design of a tire dustbased absorber with reduced height. Cladding is a technique that is used to enhance the surface properties of a part, and it has been used in many applications for many years. In this technique, a clad layer is created on the core material, and the composition of the clad layer is adjusted to enhance the performance of the core material. We use a rice husk-clad layer to enhance the impedance matching characteristics of the low-loss, tire-dust core, microwave absorber. The overall design is a two-layer, geometrically-tapered, pyramidal structure composed of two lossy waste materials. Our main goal was to make the front surface less reflective (impedance matched), hence the material of the outer layer (clad) of the absorber was selected on the basis of the analysis of the dielectric properties of the candidate materials. Optimum thickness of the clad was obtained by using CST simulation software and found to be 12 mm, for which a reflectivity performance of less than −20 dB was

show abstract

Improvement in the Low Frequency Performance of Geometric Transition Radar Absorbers Using Square Loop Impedance Layers

Cited by 16 publications

References 13 publications

Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

Fractal Frequency-Selective Surface Embedded Thin Broadband Microwave Absorber Coatings Using Heterogeneous Composites

A Physical Optics Approach to the Analysis of Large Frequency Selective Radomes

A Simple Technique for Improving the Anechoic Performance of a Pyramidal Absorber

Contact Info

Product

Resources

About