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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Isomerism in Complexes
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Meta-Dome for Broadband Radar Absorbing Structure.

Heijun Jeong1, Toan Trung Nguyen1, Sungjoon Lim2

  • 1School of Electrical and Electronic Engineering, Chung-Ang University, Heukseok-Dong, Dongjak-Gu, 156-756, Republic of Korea.

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This study introduces a novel meta-dome absorber for ultra-wideband radar absorption. The metasurface absorber effectively protects against radar signals across C and X bands with wide incidence angle tolerance.

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Area of Science:

  • Electromagnetics and Metamaterials
  • Radar Technology and Systems

Background:

  • Radomes require effective radar absorption capabilities.
  • Ultra-wideband (UWB) radar systems necessitate advanced absorption solutions.

Purpose of the Study:

  • To propose and demonstrate a meta-dome absorber for UWB radar absorption.
  • To evaluate the absorber's performance across a wide frequency range and incidence angles.

Main Methods:

  • Design of a meta-dome structure utilizing FR-4 dielectric material.
  • Full-wave electromagnetic simulation.
  • Experimental measurements of absorptivity and angular stability.

Main Results:

  • Achieved ultra-wideband absorptivity from 4.6-12 GHz, covering C and X radar bands.
  • Demonstrated wide incidence angle tolerance: 0°-40° (Transverse Electric) and 0°-60° (Transverse Magnetic).
  • FR-4 dielectric material provided effective protection for the metasurface absorber.

Conclusions:

  • The proposed meta-dome absorber offers effective UWB radar signal absorption.
  • The design exhibits robust performance across various polarization and incidence angles.
  • This technology is suitable for enhancing radar stealth and performance.