Engineering Electromagnetics
9th Edition
ISBN: 9780078028151
Author: Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher: Mcgraw-hill Education,
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Chapter 11, Problem 11.4P
Small antennas have low efficiencies (as will be seen in Chapter 14), and the efficiency increases with size up to the point at which a critical dimension of the antenna is an appreciable fraction of a wavelength, say
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Chapter 11 Solutions
Engineering Electromagnetics
Ch. 11 - Show that Ex8 = Aej(k0z+) is a solution of the...Ch. 11 - Prob. 11.2PCh. 11 - Prob. 11.3PCh. 11 - Small antennas have low efficiencies (as will be...Ch. 11 - Consider two x-polarized waves that...Ch. 11 - A uniform plane wave has electric field E8 =...Ch. 11 - Prob. 11.7PCh. 11 - An electric field in free space is given in...Ch. 11 - An example of a nonuniform plane wave is a surface...Ch. 11 - Prob. 11.10P
Ch. 11 - A uniform plane wave at frequency f= 100 MHz...Ch. 11 - Repeat Problem 11.11, except the wave now...Ch. 11 - Let jk = 0.2 + jl.5 m -1 and y = 450 +J60 for a...Ch. 11 - Describe how the attenuation coefficient of a...Ch. 11 - A 10-GHz radar signal may be represented as a...Ch. 11 - Consider the power dissipation term. E.jdv, in...Ch. 11 - Prob. 11.17PCh. 11 - Given, a 100-MHz uniform plane wave in a medium...Ch. 11 - Prob. 11.19PCh. 11 - Prob. 11.20PCh. 11 - Prob. 11.21PCh. 11 - Prob. 11.22PCh. 11 - Prob. 11.23PCh. 11 - (a) Most microwave ovens operate at 2.45 GHz....Ch. 11 - Let jk = 0.2 + jl.5 m-1 and y\ = 450 +j60 Q for a...Ch. 11 - Prob. 11.26PCh. 11 - Prob. 11.27PCh. 11 - Prob. 11.28PCh. 11 - Consider a left circularly polarized wave in free...Ch. 11 - Prob. 11.30PCh. 11 - Prob. 11.31PCh. 11 - Prob. 11.32PCh. 11 - Given a wave for which Es=10ejxax+18ejxejayV/m. in...Ch. 11 - Given, a general elliptically polarized wave as...
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- A rectangular waveguide has dimensions a = 6 cm and b = 4 cm.a) Over what range of frequencies will the guide operate single mode?b) Over what frequency range will the guide support both TE10 and TE01modes and no others?arrow_forwardThe directivity of the infinitesimal (ideal dipole) is equal to the directivity * of short dipole, that is because they have the same length They have the same gain they have the same normalized field they have the same electric fieldarrow_forward2. For a slab dielectric waveguide with n₁, n₂ for the refractive indices of the core and classing, respectively, what is the minimum slab thickness to accommodate two TE modes propagating in it? The mode's vacuum wavelength is 2o.arrow_forward
- a) Define Guide wavelength with the formula? b) A rectangular waveguide working in dominant electric mode has an operating frequency of 10 GHz and the highest cut-off wavelength the waveguide can allow is 4.58 cm. What is the broader dimension of the waveguide.arrow_forwardConsider a GaAs LED with a refractive index of 3.66. The LED's surface is coated with a dielectric with a refractive index of 2.07. Some of the emitted photons are not transmitted due to internal reflection. What is the minimum angle of incidence for total internal reflection to occur? Express your answer in degree (°).arrow_forwardElectrical Engineering 1) A 90° degree corner reflector, in conjunction with a /2 dipole feed, is used in a radar tracking system. One of the requirements for such a system is that the antenna, in one of its modes of operation, has a null along the forward symmetry axis. To accomplish this, what should be the feed spacing from the vertex (in wavelengths)? Give all the possible values of the feed-to-vertex spacing.arrow_forward
- This subject is antenna and wave propagation of ece pls solve neatly and faster thanksarrow_forward4. A particular planar waveguide comprises a guiding layer of refractive index equal to 1.454 bound top and bottom by material of refractive index 1.450. a) What is the maximum thickness of this waveguide for single-mode operation at a wavelength of 1550 nm. b) If the thickness of the above waveguide is reduced to 70% of the maximum for single mode operation at 1550 nm, what is the new cut-off wavelength for single-mode operation? ANS: a) 7.19 μm and b) 1.08 µm.arrow_forward3.9 Explain what is meant by the critical bending radius for an optical fiber. A multimode graded index fiber has a refractive index at the core axis of 1.46 with a cladding refractive index of 1.45. The critical radius of curvature which allows large bending losses to occur is 84 um when the fiber is transmitting light of a particular wavelength. Determine the wavelength of the transmitted light. Ans: 0.86 µmarrow_forward
- A material has an attenuation coefficient of 0.5 dB per centimeter and its scattering coefficient is negligibly small. What fraction of incident light can pass through a 2-centimeter thickness? a. 0.5 b. 0.25 c. 0.79 d. 0.01 e. None; the material is opaquearrow_forwardelectromagnetic theoryWhat is the solid angle unit? a) radb) mc) srd) sarrow_forward2. A symmetric dielectric slab waveguide is to guide light at wavelength A= 1.30 µm. The slab thickness is to be d = 5.00 um, and the refractive index of the surrounding material is n2 = 1.450. %3D Determine the maximum allowable refractive index of the slab material that will allow single TE and TM mode operation.arrow_forward
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How does an Antenna work? | ICT #4; Author: Lesics;https://www.youtube.com/watch?v=ZaXm6wau-jc;License: Standard Youtube License