4 (a) In general, the media in which the electromagnetic (EM) wave propagates include the free space, lossless dielectrics, lossy dielectrics and good conductors. Classify materials in Table Q.4 into their respective media type for very low (VLF) and extremely high (EHF) operating frequency. Take VLF = 3 kHz and EHF = 30 GHz. Justify based on your calculations. Table Q.4 Conductivity, o (S/m] Relative Relative Material Permittivity, &r Permeability, µr Soil (wet) Soil (dry) 10-3 10 1 10-6 8 1 (b) Wireless underground sensor network (WUSN) is built to monitor soil conditions for precise smart agriculture application. A soil sensor antenna is buried at 20 cm under the ground to communicate with a transceiver placed on the surface of the ground as shown in Figure Q.4. The transceiver operates at 3 kHz. The initial magnitude of electrical field, Eo is 100 V/m. Considering wet soil condition with parameters as in Table Q.4: TEK (i) Determine the attenuation constant, a. (ii) Find the electric field, E with all related parameters value. Assume that the wave is travelling in +z direction. (iii) Find the magnetic field propagating between the transceiver and the sensor. sensor. 14

4 (a) In general, the media in which the electromagnetic (EM) wave propagates include the free space, lossless dielectrics, lossy dielectrics and good conductors. Classify materials in Table Q.4 into their respective media type for very low (VLF) and extremely high (EHF) operating frequency. Take VLF = 3 kHz and EHF = 30 GHz. Justify based on your calculations. Table Q.4 Conductivity, o (S/m] Relative Relative Material Permittivity, &r Permeability, µr Soil (wet) Soil (dry) 10-3 10 1 10-6 8 1 (b) Wireless underground sensor network (WUSN) is built to monitor soil conditions for precise smart agriculture application. A soil sensor antenna is buried at 20 cm under the ground to communicate with a transceiver placed on the surface of the ground as shown in Figure Q.4. The transceiver operates at 3 kHz. The initial magnitude of electrical field, Eo is 100 V/m. Considering wet soil condition with parameters as in Table Q.4: TEK (i) Determine the attenuation constant, a. (ii) Find the electric field, E with all related parameters value. Assume that the wave is travelling in +z direction. (iii) Find the magnetic field propagating between the transceiver and the sensor. sensor. 14

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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