Microwave Absorbing Materials

Yuping Duan, Hongtao Guan

• Publisher: Jenny Stanford Publishing
• Year: 2016
• eBook ISBN: 9781315341033
• Edition: 1
• Topic: Physical Sciences
• Subtopic: Biology

With the phenomenal development of electromagnetic wave communication devices and stealth technology, electromagnetic wave absorbing materials have been attracting attention as antielectromagnetic interference slabs, stealth materials, self-concealing technology, and microwave darkrooms.

This book starts with the fundamental theory of electromagnetic wave absorption in loss medium space, followed by a discussion of different microwave absorbents, such as manganese dioxide, iron-based composite powder, conductive polyaniline, barium titanate powder, and manganese nitride. Then, structural absorbing materials are explored, including multilayer materials, new discrete absorbers, microwave absorption coatings, cement-based materials, and structural pyramid materials. Many of the graphics demonstrate not only the principles of physics and experimental results but also the methodology of computing.

The book will be useful for graduate students of materials science and engineering, physics, chemistry, and electrical and electronic engineering; researchers in the fields of electromagnetic functional materials and nanoscience; and engineers in the fields of electromagnetic compatibility and stealth design.

Chapter 1

Fundamentals of Electromagnetic Wave Absorbing Theory

Maxwell’s equations indicate that the time-varying electromagnetic (EM) field is a rotational solenoidal field in the source-free space (ρ = 0, J⇀=0). In other words, electric force lines and magnetic field lines are closed without any endpoints. The electric field and magnetic field cross-link and excite each other to generate EM waves, which are the main form for EM energy to propagate forward.

According to the shape of the phase surface (also known as the wave front plane), waves are classified into plane waves, spherical waves, and cylindrical waves. Among them, a plane wave is the simplest one in structure. In a small region far away from the radiating source, the spherical wave may be approximated as a plane wave. All the field quantities are in a plane normal to the direction of their propagation. The other forms of EM waves are created by mixing plane waves. If the amplitude and direction of the plane-wave electric field are identical on the whole equiphase surface, it can be defined as a uniform plane wave. Thus, it is very important to comprehend and master the transmission characteristics and basic properties of plane waves^{1, 2, 3, 4 and 5}.

Microwave Absorbing Materials

Yuping Duan and Hongtao Guan

Copyright © 2017 Pan Stanford Publishing Pte. Ltd.

ISBN 978-981-4745-10-9 (Hardcover), 978-981-4745-11-6 (eBook)

www.panstanford.com

1.1 Plane Electromagnetic Wave in Lossy Medium Space

In practice, there is more of the space consisting of lost media, although most of the time we think the space is lossy as an approximation. Next we will discuss the planar transmission characteri...

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Contents
• Preface
• 1. Fundamentals of Electromagnetic Wave Absorbing Theory
• 2. Manganese Dioxide Absorbents
• 3. Fe-Based Composite Absorbers
• 4. Conductive Polyaniline
• 5. Other Absorbents
• 6. Hybrid Microwave Absorbers
• 7. Cement-Based Electromagnetic Functional Materials
• 8. Structural Pyramid Materials
• Index