Engineering Electromagnetics
9th Edition
ISBN: 9781260029963
Author: Hayt
Publisher: MCG
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Chapter 14, Problem 14.8P
To determine
The time average Poynting
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Design a Dolph-Tschebyscheff broadside array of 8 elements, 25-dB sidelobe level, and with a spacing of λ/2 between the elements to operate at 3 GHz. Choose a “rectangular patch” or a "dipole" antenna as the array element that operates at 3 GHz. For the final antenna design, determine the:
• Half-power beamwidth (in degrees). How much narrower or wider (in degrees) is thishalf-power beamwidth compared to that of a uniform array of the same number ofelements and spacing?• How much smaller or larger (in dB) is the gain (in dB) compared to that of a uniformarray of the same number of elements and spacing? Justify you answer. Do you expectit? Why?
Design a 5-ELEMENT YAGI-UDA antenna for a 545 GHz frequency, with the following contents:a. Operation and its applicationb. Sketch of the actual antenna with its dimensions completelyc. Its computation
A 0.48520λ0 dipole antenna is made to work at 4 GHz. The antenna is then connected to a 12 V voltage source which has an internal resistance of 25 Ω)
a) Make a diagram of the above system,
b) Is an impedance matching circuit needed? If yes, where should the impedance circuit be inserted and make a diagram of the system with the adjusting circuit,
c) How many cm is the length of the dipole antenna above,
Solve Subparts A,B,C in 25 minutes ASAP
Chapter 14 Solutions
Engineering Electromagnetics
Ch. 14 - A short dipole-carrying current I0 cos t in the az...Ch. 14 - Prepare a curve, r vs. in polar coordinates,...Ch. 14 - Prob. 14.3PCh. 14 - Write the Hertzian dipole electric field whose...Ch. 14 - Prob. 14.5PCh. 14 - Prob. 14.6PCh. 14 - Prob. 14.7PCh. 14 - Prob. 14.8PCh. 14 - A dipole antenna in free space has a linear...Ch. 14 - Prob. 14.10P
Ch. 14 - A monopole antenna extends vertically over a...Ch. 14 - Find the zeros in for the E-plane pattern of a...Ch. 14 - Prob. 14.13PCh. 14 - For a dipole antenna of overall length 2l=,...Ch. 14 - Prob. 14.15PCh. 14 - Prob. 14.16PCh. 14 - Consider a lossless half-wave dipole in flee...Ch. 14 - Prob. 14.18PCh. 14 - Prob. 14.19PCh. 14 - A two-element dipole array is configured to...Ch. 14 - Prob. 14.21PCh. 14 - Prob. 14.22PCh. 14 - Prob. 14.23PCh. 14 - Prob. 14.24PCh. 14 - Prob. 14.25PCh. 14 - Prob. 14.26PCh. 14 - Consider an n-element broadside linear array....Ch. 14 - A large ground-based transmitter radiates 10 kW...Ch. 14 - Signals are transmitted at a 1-m carrier...Ch. 14 - Prob. 14.30P
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- A 0.48520λ0 dipole antenna is made to work at 4 GHz. The antenna is then connected to a 12 V voltage source which has an internal resistance of 25 Ω) a) Make a diagram of the above system, b) Is an impedance matching circuit needed? If yes, where should the impedance circuit be inserted and make a diagram of the system with the adjusting circuit, c) How many cm is the length of the dipole antenna above, d) How much power is emitted when not using the adjusting circuit and e) How much power is emitted when using the adjusting circuit. Solve subparts D,E max 20 minutes ASAParrow_forwardDesign a 5-ELEMENT YAGI-UDA antenna for a 641.14 MHz frequency,with the following contents:a. Sketch of the actual antenna with its dimensions completely and computationarrow_forwardThe normalized radiation intensity of a given antenna is given by(a) U = sin θ sin φ (b) U = sin θ sin2 φ(c) U = sin θ sin3 φ (d) U = sin2 θ sin φ(e) U = sin2 θ sin2 φ (f) U = sin2 θ sin3 φThe intensity exists only in the 0 ≤ θ ≤ π, 0 ≤ φ ≤ π region, and it is zeroelsewhere. Find the(a) exact directivity (dimensionless and in dB).(b) azimuthal and elevation plane half-power beamwidths (in degreearrow_forward
- For a monopole antenna with linearclinear distribution, if the effective length of the monopole is equal to half of wavelength, then estimate the radiation resistance of the monopole.arrow_forwardPlease show all steps A parabolic dish antenna has a diameter of 5 meter, operating at 30 GHz frequency.a) What is the effective area Ae of the antenna? b) What is the antenna power gain in ratio and in dBi?arrow_forward2.) The power density is 4 mW/m² at some distance R from an isotropic antenna. The isotropic antenna is replaced with a different antenna and the power density measured is now 60 mW/m² at the same distance R. What is the gain (in dB) of the second antenna? 3.) The received power at an airplane is calculated as Pr=-43 dBm at a range of 13 miles using free-space propagation. Determine the received power (in dBm) at a range of 52 miles.arrow_forward
- Consider a communication link operating at 15 GHz with the transmitting and receiving antennas gain of 20 dB and 15 dB, respectively. The transmitted power is 15 W and the distance between transmitter and receiver is 12 km. (i) Determine the received signal (in dBm) for the free space condition. (ii) Repeat (i) if plane earth path loss exists and both transmitting and receiving antenna height is 10m. (iii) If there is a 20-meter tall building located at 5 km from the transmitter, determine the minimum height of transmitting and receiving antennas above ground level to ensure unobstructed LOS conditions.arrow_forwardFor an Omni-directional antenna, the measurements show the Half Power Beam Width (HPBW) in vertical and horizontal planes are 30 degree and 20 degree respectively. If this antenna has a loss resistance of 25ohm and efficiency n=0.8, calculate:i. Antenna’s gain in dB;ii. Radiation resistanceiii. How the efficiency of this antenna can be improved? Support your answer with applicable equations and results.arrow_forward"If a receiving antenna has a gain of 26 dB, calculate its effective capture area (m^2) if its operating at 1.7 GHz. Enter only the numerical value. No need for the unit. Use four decimal places (if the answer is not an integer)."arrow_forward
- A pyramidal horn antenna with aperture dimensions of 9 ×8 cm and operating at 5 GHz. What will be the directivity of the antenna?arrow_forwardThe radial component of the radiated power density of an infinitesimal linear dipole of length is given by Wav=ar Wr =arAmsin2(theta)/r2 W/m2 Where Am = Peak value of power density; theta = usual spherical co-ordinate and ar = radial unit vector. Calculate the directivity of the antenna.arrow_forwardThe far-field ranges of the wire antenna given in the figure at 5 GHz Find where it started . .arrow_forward
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