Complex Dielectric Measurements of Forest Fire Ash at X-Band Frequencies

Full-Wave Analysis of Dielectric-Loaded Cylindrical Waveguides and Cavities Using a New Four-Port Ring Network

“…The series expansion used is a generalization of the Dini series expansions [49] as they were developed in [50]. This series expansion is included in Appendix, section B (superindex (3) in function     is a normalization term for the electric field [51,52]. This term is also calculated in Appendix, section C. By equating the magnetic field at port 3 with the inner magnetic field, defined in (6), over the region z=h, we get: Defining the parameter 31 Y as the relation between the magnetic field at port 3 and electric field at port 1, we have: Since the remaining parameters of columns 2, 3 and 4 of the Y-matrix are calculated in a similar way to the parameters in the first column, Y i1 , we do not include here (for the sake of space) how their expressions are determined.…”

“…Highpermittivity materials are used to reduce the dimensions of circuits at lower frequencies. Other important new areas of applications include microwave heating [2] and sensors [3][4][5].…”

A cost effective solution for development of broadband radar absorbing material using electronic waste

“…The negative trend has been observed in the imaginary part of permeability (μ″) for both the wooden templates as well as metallurgical slags and scrap tire cement paste based composites, similar trend has been observed for the electronic-waste composite material. Baum et al [11] has studied the dielectric properties of the powdered forest fire ash of burnt Australian forest species of [25], where author has reported the real and imaginary parts of permittivity values of the samples at 8.0 GHz. It can be seen from Table 1 that, the dielectric and magnetic properties of an electronic waste composite material are found to be in the suitable range for the radar absorption, among other reported work.…”

“…The rice husk-rubber tyre dust based composite material with enhanced microwave absorption over the frequency range of 7 to 13 GHz has been introduced by Cheng et al [10]. The powdered forest fire ash of various trees like eucalypt, bracken fern, she oak, wattle, and cypress [11], sugar cane bagasse [12], and rubber and oil palm leaf [13] are another important class of waste composite materials, which have been recently studied for various applications. But agriculture wastes are eco-friendly and are biodegradable as compared to toxic hazardous electronic-waste.…”

An efficient use of waste material for development of cost-effective broadband radar wave absorber

“…Waste materials are getting considerable interest of researchers due to their good dielectric and magnetic properties, ease of availability, and low cost. [3][4][5][6][7][8] So far, less attention is given to the mineral dust and beach sand-based composite RAMs. In general, the effectiveness of the absorber mainly depends on the EM properties of the material (i.e.…”