This document discusses various topics related to antennas and propagation, including:
- The basic functions of antennas for transmission and reception of signals
- Types of radiation and reception patterns that characterize antenna performance
- Common types of antennas like dipole, vertical, and parabolic reflective antennas
- Factors that influence signal propagation over distance like free space loss, noise, multipath interference, and atmospheric effects
- Techniques to improve reliability like diversity combining, adaptive equalization, and forward error correction coding.
Possible media for communication
Introduction to Communication Media
Introduction to Microwave communication
Manufacturers of Microwave
Why Microwave?
Characteristics of microwave
Types of Microwave communication
Types of Microwave Links
Requirements for the microwave communication
What is LOS?
Wave Propagation in the atmosphere
Multi path Propagation
LOS Purpose & requirements
Limitations of Line of Sight Systems
Design of Line of Sight Microwave Links
K- factor
Variations of the ray curvature as a function of k
Fresnel zone
Obstacles & Loses
Knife Edge Obstacles
Smooth Spherical Earth Obstacles
Path Loss
Other losses
Why vertical polarization favorable at high freq
Antenna type & Gain
RECEIVER SENSITIVITY, FADE MARGIN AND SIGNAL TO NOISE RATIO
Fading Margin
Reliability
Possible media for communication
Introduction to Communication Media
Introduction to Microwave communication
Manufacturers of Microwave
Why Microwave?
Characteristics of microwave
Types of Microwave communication
Types of Microwave Links
Requirements for the microwave communication
What is LOS?
Wave Propagation in the atmosphere
Multi path Propagation
LOS Purpose & requirements
Limitations of Line of Sight Systems
Design of Line of Sight Microwave Links
K- factor
Variations of the ray curvature as a function of k
Fresnel zone
Obstacles & Loses
Knife Edge Obstacles
Smooth Spherical Earth Obstacles
Path Loss
Other losses
Why vertical polarization favorable at high freq
Antenna type & Gain
RECEIVER SENSITIVITY, FADE MARGIN AND SIGNAL TO NOISE RATIO
Fading Margin
Reliability
What is Path loss?
Indoor Propogation Models?
Multi-floor model?
Partition attenuation model?
Empirical path loss model?
ITU Model for Indoor Attenuation/ Wall and floor factor model?
FRIIS MODEL?
Log-distance path loss model?
problem definition in research has the basic role in research, hence, this presentation pertaining to identification of problem by the use of different method
Wireless Communication and Networking by WilliamStallings Chap2Senthil Kanth
Hai I'm Senthilkanth, doing MCA in Mepco Schlenk Engineering College..
The following presentation covers topic called Wireless Communication and Networking
by WilliamStallings for BSc CS, BCA, MSc CS, MCA, ME students.Make use of it.
Wireless Communication and Networking
by WilliamStallings Chapter : 2Transmission Fundamentals
Chapter 2
Electromagnetic Signal
Function of time
Can also be expressed as a function of frequency
Signal consists of components of different frequencies
Time-Domain Concepts
Analog signal - signal intensity varies in a smooth fashion over time
No breaks or discontinuities in the signal
Digital signal - signal intensity maintains a constant level for some period of time and then changes to another constant level
Periodic signal - analog or digital signal pattern that repeats over time
s(t +T ) = s(t ) -¥< t < +¥
where T is the period of the signal
Time-Domain Concepts
Aperiodic signal - analog or digital signal pattern that doesn't repeat over time
Peak amplitude (A) - maximum value or strength of the signal over time; typically measured in volts
Frequency (f )
Rate, in cycles per second, or Hertz (Hz) at which the signal repeats
Time-Domain Concepts
Period (T ) - amount of time it takes for one repetition of the signal
T = 1/f
Phase () - measure of the relative position in time within a single period of a signal
Wavelength () - distance occupied by a single cycle of the signal
Or, the distance between two points of corresponding phase of two consecutive cycles
Sine Wave Parameters
General sine wave
s(t ) = A sin(2ft + )
Figure 2.3 shows the effect of varying each of the three parameters
(a) A = 1, f = 1 Hz, = 0; thus T = 1s
(b) Reduced peak amplitude; A=0.5
(c) Increased frequency; f = 2, thus T = ½
(d) Phase shift; = /4 radians (45 degrees)
note: 2 radians = 360° = 1 period
Sine Wave Parameters
Time vs. Distance
When the horizontal axis is time, as in Figure 2.3, graphs display the value of a signal at a given point in space as a function of time
With the horizontal axis in space, graphs display the value of a signal at a given point in time as a function of distance
At a particular instant of time, the intensity of the signal varies as a function of distance from the source
Frequency-Domain Concepts
Fundamental frequency - when all frequency components of a signal are integer multiples of one frequency, it’s referred to as the fundamental frequency
Spectrum - range of frequencies that a signal contains
Absolute bandwidth - width of the spectrum of a signal
Effective bandwidth (or just bandwidth) - narrow band of frequencies that most of the signal’s energy is contained in
Frequency-Domain Concepts
Any electromagnetic signal can be shown to consist of a collection of periodic analog signals (sine waves) at different amplitudes, frequencies, and phases
The period of the total signal is equal to the period of the fundamenta
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
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Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
2. Introduction
An antenna is an electrical conductor or
system of conductors
TRANSMISSION OF A SIGNAL
Convert Radio frequency electrical energy from
the transmitter to electromagnetic energy
Radiates Electromagnetic energy into space
RECEPTION OF A SIGNAL
Collects electromagnetic energy from space
Convert Electromagnetic signal to Radio
Frequency electrical energy signal back to
receiver
- ,In two way communication the same
antenna can be used for transmission and
reception
3. Radiation Patterns
Radiation pattern
Graphical representation of radiation
properties of an antenna
A common way to characterize the
performance of an antennas
-Depicted as two dimensional cross section
Beam width ( -or half power beam
)width
Measure of directivity of antenna
Reception pattern
’Receiving antenna s equivalent to radiation
pattern
4. Types of Antennas
( )Isotropic antenna idealized
Radiates power equally in all directions
The radiation pattern provides a convenient means of
,determining the beam width of an antenna which is a
.common measure of the directivity of an antenna
, -The beam width also referred to as the half power
,beam width is the angle within which the power
radiated by the antenna is at least half of what it is in
the most preferred direction
5. Types of Antennas
Dipole antennas
H -alf wave dipole antenna
( )or Hertz antenna
-Quarter wave vertical antenna
( )or Marconi antenna
Parabolic Reflective Antenna
A parabola is the locus of all points equidistant
.from a fixed line and a fixed point not on the line
:Focus The fixed point is called Focus
Directix: The fixed line is called Directix
6. Antenna Gain
Antenna gain
The measure of directionality of an antenna
, ,Power output in a particular direction compared to
that produced in any direction by a perfect
( )omnidirectional antenna isotropic antenna
Effective area
is a measure of how effective an antenna is at
receiving the power of radio waves
Related to physical size and shape of antenna
7. Antenna Gain
Relationship between antenna gain
and effective area
G = antenna gain
Ae = effective area
f = carrier frequency
= (»c speed of light 3 ´ 108
/ )m s
λ = carrier wavelength
2
2
2
44
c
AfA
G ee π
λ
π
==
12. Sky Wave Propagation
( - )Frequency range of 2 30 MHz
Signal reflected from ionized layer of
atmosphere back down to earth
,Signal can travel a number of hops
back and forth between ionosphere and
’earth s surface
Reflection effect caused by refraction
Examples
Amateur radio
( )CB radio Citizen band Radio
14. - -Line of Sight
Propagation Above 30 MHz
Transmitting and receiving antennas must be
within line of sight
Satellite communication – signal above 30 MHz
not reflected by ionosphere
Ground communication – antennas within effective
line of site due to refraction
Refraction – bending of microwaves by the
atmosphere
Velocity of electromagnetic wave is a function of the
density of the medium
,When wave changes medium speed changes
Wave bends at the boundary between mediums
15. - -Line of Sight Equations
( )Optical line of sight With no intervening obstacle
, ,Effective or radio line of sight
d = ( )distance between antenna and horizon km
h = ( )antenna height m
= ,K adjustment factor to account for refraction rule of
= /thumb K 4 3
hd 57.3=
hd Κ= 57.3
16. - -Line of Sight Equations
Maximum distance between two antennas for
:LOS propagation
h1 = height of antenna one
h2 = height of antenna two
( )2157.3 hh Κ+Κ
18. Attenuation
Strength of signal falls off with
distance over transmission medium
Attenuation factors for unguided
:media
Received signal must have sufficient
strength so that circuitry in the receiver
can interpret the signal
Signal must maintain a level sufficiently
higher than noise to be received without
error
Attenuation is greater at higher
,frequencies causing distortion
19. Free Space Loss
For any type of wireless communication the
. ,signal disperses with distance Therefore an
antenna with a fixed area will receive less
signal power the farther it is from the
.transmitting antenna
For satellite communication this is the primary
.mode of signal loss Even if no other sources
,of attenuation or impairment are assumed a
transmitted signal attenuates over distance
because the signal is being spread over a
.larger and larger area This form of attenuation
is known as free space loss
20. Free Space Loss
,Free space loss ideal isotropic antenna
Pt = signal power at transmitting antenna
Pr = signal power at receiving antenna
λ = carrier wavelength
d = propagation distance between antennas
c = (» / )speed of light 3 ´ 10 8 m s
where d and λ ( . ., )are in the same units e g meters
( ) ( )
2
2
2
2
44
c
fdd
P
P
r
t π
λ
π
==
21. Free Space Loss
:Free space loss equation can be recast
==
λ
πd
P
P
L
r
t
dB
4
log20log10
( ) ( ) dB98.21log20log20 ++−= dλ
( ) ( ) dB56.147log20log20
4
log20 −+=
= df
c
fdπ
22. Free Space Loss
Free space loss accounting for gain
of other antennas
Gt = gain of transmitting antenna
Gr = gain of receiving antenna
At = effective area of transmitting antenna
Ar = effective area of receiving antenna
( ) ( ) ( ) ( )
trtrtrr
t
AAf
cd
AA
d
GG
d
P
P
2
22
2
22
4
===
λ
λ
π
23. Free Space Loss
Free space loss accounting for gain of
other antennas can be recast as
( ) ( ) ( )rtdB AAdL log10log20log20 −+= λ
( ) ( ) ( ) dB54.169log10log20log20 +−+−= rt AAdf
25. Thermal Noise
Thermal noise due to agitation of electrons
Present in all electronic devices and
transmission media
Cannot be eliminated
Function of temperature
Particularly significant for satellite communication
because of the weakness of the signal received
at satellite substation
26. Thermal Noise
Amount of thermal noise to be found in
a bandwidth of 1Hz in any device or
:conductor is
N0 = noise power density in watts per 1 Hz of
bandwidth
= = .k Boltzmann's constant 1 3803 ´ 10-23
/J K
T = , ( )temperature in kelvins absolute temperature
( )W/Hzk0 TN =
27. Thermal Noise
Noise is assumed to be
independent of frequency
Thermal noise present in a
bandwidth of B ( ):Hertz in watts
, -or in decibel watts
TBN k=
BTN log10log10klog10 ++=
BT log10log10dBW6.228 ++−=
28. Noise Terminology
Intermodulation noise – occurs if signals with
different frequencies share the same medium
Interference caused by a signal produced at a frequency
that is the sum or difference of original frequencies
Crosstalk – unwanted coupling between signal
. .paths e g unwanted signal picked up by
microwave antenna or electrical coupling between
nearby twisted pair or rarely coax cable line
carrying multiple signal
Impulse noise – irregular pulses or noise spikes
Short duration and of relatively high amplitude
,Caused by external electromagnetic disturbances lightning
or faults and flaws in the communications system
29. Expression Eb/N0
Ratio of signal energy per bit to noise
power density per Hertz
The bit error rate for digital data is a
function of Eb/N0
Given a value for Eb/N0 to achieve a desired
,error rate parameters of this formula can be
selected
As bit rate R ,increases transmitted signal
power must increase to maintain required
Eb/N0
TR
S
N
RS
N
Eb
k
/
00
==
30. Other Impairments
Atmospheric absorption – water vapor and oxygen
( –contribute to attenuation 22GHz peak attenuation 15
)GHz low attenuation
Multipath – obstacles reflect signals so that multiple
(copies with varying delays are received mobile
, )telephony there are obstacles in abundance
Refraction – bending of radio waves as they
propagate through the atmosphere
32. Multipath Propagation
Reflection - occurs when signal
encounters a surface that is large relative
to the wavelength of the signal
Diffraction - occurs at the edge of an
impenetrable body that is large compared to
wavelength of radio wave
Scattering – occurs when incoming signal
hits an object whose size in the order of
the wavelength of the signal or less
33. The Effects of Multipath
Propagation
Multiple copies of a signal may arrive
at different phases
,If phases add destructively the signal
,level relative to noise declines making
detection more difficult
( )Inter symbol interference ISI
One or more delayed copies of a pulse
may arrive at the same time as the
primary pulse for a subsequent bit
34. Types of Fading
Fast fading-
900MHz
20 or 30dB change in amplitude over short distance
Slow fading
Due to change in average received power level to
which fluctuation occurs
( - )Flat fading Non selective Fading
In which all frequency components of the received
signal fluctuates in the same proportions
simultaneously
35. Types of Fading
Selective fading
affects unequally the different spectral components
of a radio signal
Rayleigh fading
occurs when there are multiple indirect paths
between transmitter and receiver and no distinct
,dominant path such as an LOS path
Rician fading
best characterizes a situation where there is a
direct LOS path in addition to a number of Sindirect
multipath signals
37. Forward Error
Correction Occurs in digital data
-Transmitter adds error correcting code to
data block
Code is a function of the data bits
-Receiver calculates error correcting code
from incoming data bits
,If calculated code matches incoming code
no error occurred
- ’ ,If error correcting codes don t match
receiver attempts to determine bits in error
and correct
38. Adaptive Equalization
Can be applied to transmissions that carry
analog or digital information
Analog voice or video
,Digital data digitized voice or video
Used to combat inter symbol
( )interference ISI
Involves gathering dispersed symbol
energy back into its original time interval
Techniques
Lumped analog circuits
Sophisticated digital signal processing
algorithms