Homework 19 Solution.
7.3-11 A horn antenna with a 185.5 137.4cm rectangular aperture has the
following measured parameter values at 0.44GHz : HPE o = 30o , HPH o = 27o ,
and G = 15.5dB .
a. Compute t
Homework 1 Solution.
1. Calculate and compare the power density and electric eld strength for
= 90 for a distance of 20 km from dipole antennas radiating 100 W of
power at 1.25 MHz. Consider antennas
Homework 3 Solution.
2.4-6. A single turn circular loop 15cm in radius is made of 3mm diameter copper wire. Calculate the radiation resistance, ohmic resistance, input
impedance and radiation eciency
Homework 18 Solution.
33. Calculate the gain of a slot antenna of dimensions 29cms 2.0cms for
use at a frequency of 500M Hz . Calculate the center-feed-point impedance
for this antenna.
Solution:
=
3
Homework 17 Solution.
6.1-6 Plot the linear, polar plot of a traveling wave long wire antenna that is
eight wavelengths long.
Solution:
Matlab Code
clc, clear all, close all
L=8;
betaL=pi*L;
theta=lin
Homework 14 Solution.
5.4-9 The input impedance of a driven element in the presence of a shortcircuited parasitic element is 40 45o and is 60 30o when the terminals of
the parasitic element are open-c
Homework 13 Solution.
5.1-13 Use the length reduction procedure for half-wave resonance in Table
5-2 to calculate the resonant frequencies of the two dipoles in Fig. 5-7.
Solution:
For dipole wire wit
Homework 12 Solution.
5.8-1 Show how the normalized principal plane patterns of (5-74) follow from
(5-73). Discuss the electric eld polarization in each plane.
Solution:
E = Eo cos()f (, )
E = Eo cos(
Homework 11 Solution.
14. A cellular telephone monopole antenna of equivalent impedance ZA =
20 j 90 is to be matched for maximum power at the midband transmission
frequency of 837M Hz . Design a two
Homework 8 Solution.
18. Calculate the feed point impedances and radiation patterns for the following 3-element antenna arrays:
a. Side-by-side parallel dipole antennas each of length L = 0.4781 (nomi
Homework 7 Solution.
16. Calculate the radiation patterns and directivities/gains of the following
x-directed antenna arrays of 0.4 dipoles for = 90o , i. e., the xy plane
a.N = 10,
dx
= 0.45, = 0o
dx
Homework 5 Solution.
2.5-11. A Low Earth Orbit (LEO) satellite system transmits 1W at 1.62GHz
using a 29dB gain antenna with spot beams directed towards users on earth
that are a maximum of 1500Km awa
Homework 4 Solution.
2.5-5. The eective aperture of a 1.22 diameter parabolic reector antenna
is 55% of the physical aperture area. Compute the gain in dB at 20GHz .
Solution:
d = 1.22m,
= 0.015m, f =