Arab Academy for Science, Technology & Maritime Transport
Antennas Engineering
EC 544

Spring 2014
Antenna Theory
EC 544
Lecture#4
LECTURE 4
NonUniform Arrays
Binomial Arrays
Amplitude Arrays
2 . Array Factor
3.Spacing
A. For No Side Lobes, Select
B. For No Grating Lobes, Select
d /2
d<
General Law of the Array Factor
For
N=2
(AF) 2 = cos u
For N = 3
Arab Academy for Science, Technology & Maritime Transport
Antennas Engineering
EC 544

Spring 2014
Antenna Engineering
EC 544
Lecture#1
Uniform Arrays
Linear, Circular, Planar
Two Isotropic elements array (Far field observation)
If the reference point is chosen to be the physical center of the
array, the array factor will be:
For small values of , the
Arab Academy for Science, Technology & Maritime Transport
Antennas Engineering
EC 544

Spring 2014
Antenna Theory
EC 544
Lecture#5
Chapter 5
Dolph Tchebycheff
Design
Equal Side Lobes
Properties of Tschebyscheff Polynomial
Number of Zeroes = Order of Polynomial (m)
Number of Lobes = m 1
For  1 Z 1
 T m (z) 1
For
 T m (z) 1
z1
All polynomials
Arab Academy for Science, Technology & Maritime Transport
Antennas Engineering
EC 544

Spring 2014
Antenna Engineering
EC 544
Lecture#9
Chapter 9
Horn Antenna
Horn Antenna
The horn is widely used as a feed element for large radio
astronomy, satellite tracking, and communication dishes found
installed throughout the world. In addition to its utility as