Permittivity

CHAPTER 3 MICROSTRIP PATCH ANTENNA 3.1 INTRODUCTION In high-performance spacecraft, satellite and aircraft, where low size, low weight, moderate cost, ease of installation are constraints, low profile antenna may be required. To meet these requirements, microstrip antennas can be used [1], [18]. Microstrip antenna technology has been the most rapidly developing topic in the antenna field in the last fifteen years, receiving the creative attentions of academic, industrial, and government engineers

Abstract:- In this paper a seven-band stacked patch antenna design for C, X and Ku band is considered. To generate multiband frequencies micro strip stacked patch antenna is introduced. The proposed structure is a planar structure having all the dimensions in mm and is designed by using a substrate of FR4 having thickness 1.6 mm. This proposed antenna is having seven bands of operation. The considered antenna consists of H-slot loaded fed patch, stacked with dual U-slot loaded rectangular patch.

(DMSO) of different concentration have been measured at 25oC using Time Domain Reflectometry (TDR) technique. The measured values of permittivity ('), dielectric loss (") at 10GHz, static dielectric constant (0) and high frequency limiting dielectric constant () have been used to determine the values of molecular relaxation time (τ), and excesses permittivity (E) of the different composition binary and ternary mixtures. The analysis of the results based on the formation of H-bonded complexes

Enhancement of the conductivity and dielectric properties of PVA/Ag nanocomposite films using γ irradiation. Kamal M. Abd El-Kader , Wahib M. Attia , Ahmed .G. El-Shamy * Physics Department, Faculty of Science, Suez Canal University, Ismailia, Egypt Abstract The influence of gamma irradiation on the electrical and dielectric properties of AgNO3/ PVA films was investigated. The films were prepared by in-situ chemical reduction techniques, then irradiated with different gamma doses (25, 50, 75, 100

Dc conductivity and dielectric spectroscopic for PVA-Ag nanocomposite films The influence of gamma irradiation on the electrical and dielectric properties of AgNO3/ PVA films was investigated. The films were prepared by casting techniques, then irradiated with different gamma doses (25, 50, 75, 100, 125 KGy). The content of the Ag in the PVA film were determined by using atomic absorption spectroscopy (AA), and were found to be 0.4 wt %. The films have been characterized through dielectric spectroscopy

Sensing and Instrumentation Case Study Properties, Processing and Applications of Capacitance Sensors: A Case Study of Capacitance Micrometry Stephen Grant – 01267044 2014 Abstract This is a case study that looks in detail at the properties, process and application of capacitance micrometers. The fundamentals and designs of capacitance micrometers are analyzed in detail in order to assess their viable use within industry. Suitable comparisons with alternatives to capacitance micrometry

The stress–strain curves of the pure SR and SR composites are presented in Figure 3(a), indicating that the stresses at 100% strain and 300% strain increase with increasing content of BT particles. The main reason for the increased stress at definite elongation is the reinforcing effect of the inorganic particles [38]. In addition, the elongation at break of the SR composites decreased after adding BT particles, attributed to the BT particles acting as physical links, thus limiting the flexibility

Theory Electric force can be defined as an attraction or repulsion between two particles that is directly related to the charge of the two particles. So when a different voltage is applied to two metal plates the opposite charges that are applied produce an attraction. To be able to figure out the magnitude of the field on these plates one must know the charges, surface area, and the vacuum dielectric constant. With knowing the value of the electric field one can then calculate the value of the

Where εff = Effective dielectric constant εr = Dielectric constant of substrate h = Height of dielectric substrate W = Width of the patch Consider Figure 4.6 below, which shows a rectangular microstrip patch antenna of length L , width W resting on a substrate of height h . The co-ordinate axis is selected such that the length is along the x direction, width is along the y direction and the height is along the z direction. Figure 4.6 Strip antenna with coordinate axis In order to operate in the

situation, the elastic and electromagnetic properties are negatively associated in example 1 and positively associated in examples 2 and 3. The initial models are critical for the solution of FWI problem. In practice, the initial P-wave velocity and permittivity model could be recovered by velocity analysis, and the initial conductivity model could be provided by electrical resistivity tomography. In