Propagation of EM Waves
Dr. Navneet Gupta,
EEE Group
Lecture 8-9
1
EEEC433
Dr. Navneet Gupta
Objective
To discuss
The propagation of waves through space and media
Reflection
Refraction
Diffraction
Our major goal:
To solve Maxwells equation and describe
Antenna measurements
Dr. Navneet Gupta
Lecture:36
From previous lecture
Pr = Pt Gt Gr
4r
2
4r
Pr = Pt + Gt + Gr 20 log10
dB
EIRP = Pt Gt
Effective isotropic radiated power
(EIRP)
The last term represents the free-space transmission
loss, or path los
Radio Link and Radar
Equation
Dr. Navneet Gupta
Lecture: 35
Radio Link and Friis Formula
AA
Pr
= er 2et
Pt
r 2
Pr
= GrGt
Pt
4 r
2
EEEC433
(dimensionless) Friis transmission formula
Dr.Navneet Gupta
2
Friis transmission formula relates the power receive
Antennas and Antenna Arrays
Dr. Navneet Gupta
Lecture-28-30
EEEC433
Dr. Navneet Gupta
1
Basic Concepts
Antenna is a radiator and sensor of EM waves
It is also a transducer and impedance matching
device.
It can be designed to direct EM energy in desired
Waveguide Cavity Resonator
Lecture-27
Dr. Navneet Gupta
EEE group
EEEC433
Dr. Navneet Gupta
1
Mainly used for energy storage.
At high frequencies ( 100 MHz) the RLC circuits
elements are inefficient when used as resonators.
At high frequencies the RLC
Wave Guides
Lecture 23-26
Dr. Navneet Gupta
WAVEGUIDES
TRANSMISION LINES
Give larger BW and lower
signal attenuation
At microwave frequencies (3300 GHz); T-line become
inefficient as a result of skin
effect and dielectric losses
Waveguide can operate
only
Terminated Transmission Line
EEEC 433-Lecture 17
Dr. Navneet Gupta
EEE C433
Dr. Navneet Gupta
Introduction
GENERAL DEFINITION
A transmission line can be defined as a device for
transmission
propagating or guiding energy from one point to
another.
anothe
OBLIQUE INCIDENCE
Dr. Navneet Gupta, EEE Group
Lecture 14-16
Wave propagation in lossless
medium (1 to 2)
Transmission
step-1
Laws of wave
propagation in a
lossy medium (3
to 4)
Receiving
step
EEEC 433
Dr. Navneet Gupta
2
Consider a linearly polarized pl
WAVE POLARIZATION
Dr. Navneet Gupta, EEE Group
Lecture-13
EEEC433
Dr. Navneet Gupta
1
Wave Polarization
Describes the time-varying behaviour of the electric field
intensity vector at a given point in space.
Case-1: Direction of E remains same with time
Plane Waves at Interfaces
Dr. Navneet Gupta
EEE Group
Lecture-10-12
2/9/2009
EEE C433
Dr. Navneet Gupta
1
Normal Incidence -Plane Wave incident on
boundary between two media
2/9/2009
EEE C433
Dr. Navneet Gupta
2
Contd
Ei + Er = Et
Boundary conditions:
Tan
Transmission Lines
Transmission
Circuit and Field theory)
EEE C 433
Lecture 6-7
Dr. Navneet Gupta
EEE Group
GENERAL DEFINITION
A transmission line can be defined as a device for
propagating or guiding energy from one point to
propagating
another. The prop
Time - Varying
Time
Fields
EEE C 433
Lecture 5
Dr. Navneet Gupta
Dr. Navneet
Assistant Professor, EEE Group
Time-Varying Fields
Time-Varying Fields
Stationary charges
electrostatic fields
Steady currents
magnetostatic fields
Time-varying currents
electrom
Electromagnetic Fields and Waves
EEE C 433
Lecture 1-4
Dr. Navneet Gupta
Dr. Navneet
Assistant Professor, EEE Group
1/19/2009
1/19/2009
BITS, PILANI
Gupta
Dr. Navneet
1
Course Description
Course No.
Course Title
: EEE C433
: Electromagnetic Fields
and Wav