UNIVERSITY OF CALIFORNIA, SAN DIEGO
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
ECE 103
Prof. Duygu Kuzum
Spring 2016
Homework Assignment #4
Due at the beginning of class on Tuesday, 5/10/16
Problem 1:
Problem 2:
Problem 3:
Cons
PROBLEM 8
The code
ang1 = 0:0.05:2*pi; % angles in radians
a=cos(pi/6);
rho1 = (sin(5*pi*cos(ang1)-5*pi*a)./(10*sin(pi/2)*cos(ang1)-pi*a/2);
polar(ang1,rho1,'r-')
The plot
PROBLEM 9
Ordinary End Fire Case
Code
ang1 = 0:0.05:2*pi; % angles in radians
a=(2*
ECE123
Homework 6
1. Knowing that electric currents cause radiation, how can we explain radiation from
apertures, where there is no current? What is the name of this principle? Do magnetic
currents exist, or are they just a mathematical tool?
2. What
ECE123
Homework 3
1. An antenna sees an average temperature of 500K, and it has a bandwidth of 100 MHz.
What is the noise power received from the environment? If the antenna receives a
signal of 1 W, what is the CNR in dB?
2. An isotropic antenna see
ECE123
Homework 1
1. What is the name of the vector S that describes power flow for plane waves? Express it
in terms of E and H. If S is oriented along the +z direction, and E is along the +y direction,
what is the direction of H?
2. What is the rati
ECE123
Homework 2
1. Assume a dipole is 10 cm long, and 1 mm in diameter, is operating at 100 MHz, and is
made of copper. In the small dipole approximation,
a. What is the radius of the reactive near field?
b. What is the radius of the radiating near
ECE123
Homework 4
1. For a uniform (i.e. constant current profile) line source, what is the level of the first
sidelobe relative to the main beam? What is its value expressed in dB?
2. What is the half power beamwidth of the pattern factor (not incl