This document discusses the fundamentals of microwave link design. It covers topics such as the frequency ranges used, types of microwave links based on distance (long haul, medium haul, short haul), components of a microwave link including indoor and outdoor units, antennas, and factors that affect microwave link performance such as multipath fading and rain attenuation. It also provides information on polarization, diversity techniques, link budget calculations, and considerations for deploying microwave links.
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
Introduction to basics of wireless networks such as
• Radio waves & wireless signal encoding techniques
• Wireless networking issues & constraints
• Wireless internetworking devices
Introduction to basics of wireless networks such as
• Radio waves & wireless signal encoding techniques
• Wireless networking issues & constraints
• Wireless internetworking devices
Microstrip Antenna for ISM Band (2.4GHz) Applications-A reviewIJERA Editor
The past decade has seen a rapid development of wireless communication systems. This continuous trend is bringing about a wave of new wireless devices placing several demands on the antenna such as size miniaturization, power consumption, simplicity, compatibility with printed-circuit technology, low profile, light weight, lower return loss and good radiation properties. This paper provides a comprehensive review of the research work done in the recent past by various authors on the design and optimization of the planar microstrip antenna operating in ISM band. An exhaustive list of reference has been provided.
Multiband Microstrip Antenna for Wi-MAX Application-A studyIJERA Editor
The wireless revolution is transforming the existing global telecommunications networks into an integrated system providing a broad class of communication services to customers anywhere, anytime in motion or fixed. An antenna is an important device in wireless communication system as its performance will have direct effect on the total system. The continuous shrinking of size of the electronic systems demands small size of antenna elements which can cater the need of multiband operation in order to fit properly in wireless devices without compromising the radiation properties of the antenna. This paper presents a review of the research work done by various authors on the topic multiband microstrip antenna for Wi-MAX application in the recent past.
Performance of modeling wireless networks in realistic environmentCSCJournals
A wireless network is realized by mobile devices which communicate over radio channels. Since, experiments of real life problem with real devices are very difficult, simulation is used very often. Among many other important properties that have to be defined for simulative experiments, the mobility model and the radio propagation model have to be selected carefully. Both have strong impact on the performance of mobile wireless networks, e.g., the performance of routing protocols varies with these models. There are many mobility and radio propagation models proposed in literature. Each of them was developed with different objectives and is not suited for every physical scenario. The radio propagation models used in common wireless network simulators, in general researcher consider simple radio propagation models and neglect obstacles in the propagation environment. In this paper, we study the performance of wireless networks simulation by consider different Radio propagation models with considering obstacles in the propagation environment. In this paper we analyzed the performance of wireless networks by OPNET Modeler .In this paper we quantify the parameters such as throughput, packet received attenuation.
A NEW MODIFIED SYSTEM FOR EQUAL POWER DIVISION WITH LCC FOR WIRELESS APPLCATIONSijistjournal
In this paper, a new modified system for equal power division is implemented with the help of rectangular micro strip patch antenna, Gysel power divider and leakage cancellation circuit. Today’s world power division plays an important role in wireless application areas such as base stations, antenna arrays, handheld devices etc., Here micro strip patch antenna is implemented with FR4 as a substrate material due to its benefits such as low loss and low fabrication cost while the ground material is aluminium due to its conductivity. For a good system, the return loss should be highly desirable and insertion loss should be low. Our proposed system is designed with a combination of micro strip patch antenna, leakage cancellation circuit and Gysel power divider produces equal power division with low loss such as insertion loss is measured as -39.291dB, return loss as -16.11dB and leakage cancellation as 6dB which was designed and simulated in Agilent Advanced Design System software (2009).
Digital transmission of high resolution signal and bandwidth requirement of DACSHIV DUTT
How to select desired bandwidth of DAC when high signal resolution to be transmitted or receive. This presentation will help out to understand how data compression and higher modulations optimized the desired bandwidth. Higher modulations required less bandwidth as number of bit per symbol higher but that is not easy to implement as more susceptible to noise.
Basic blocks to understand RFFE Architecture. how Analog front end and Digital front is different. Basic components like Filter, Mixer, Power Amplifier, circulator, Duplexer, LNA and demodulator working is explained. It can held to design your own front end as RF link budget has been explained in well manner. what to do to avoid saturation of PA?
this presentation has been designed for understanding of ADC function, Continuous and Discrete signal, Nyquist criterian for sampling, quantization error and advantage disadvantage of different type of ADC
DEVELOPMENT OF A SOFTWARE TOOL FOR PLANNING MICROWAVE SYSTEMS AT ABOVE 10 GHz, ESTIMATING CO-CHANNEL INTERFERENCE AND RAIN ATTENUAITON, USING ITU-MODEL ON MATLAB AND TO VALIDATE THE SOFTWARE AGAINST AN INDUSTRY STANDARD (CONNECT) TOOL”
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
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.
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/
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
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.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
2. Microwaves are electromagnetic radiations in the
frequency range 1 GHz to 30 GHz (generally for
Telecom).
3.
4. Small capacity systems generally employ the
frequencies less than 3 GHz while medium and
large capacity systems utilize frequencies ranging
from 3 to 15 GHz. Frequencies > 15 GHz are
essentially used for short-haul transmission.
5. Less affected by natural calamities
Less prone to accidental damage
Links across mountains and rivers are more
economically feasible
Single point installation and maintenance
Single point security
They are quickly deployed
6.
7. As the frequency increases, the length of the link
decreases. Due to the high frequency range (2–
58GHz),the microwave links can be classified into
three main categories:
(a) Long haul
(b) Medium haul
(c) Short haul
8. The frequency of operation of these links is
usually 2–10 GHz. In the best of climatic
conditions and frequency of operation, the
distance covered by the links could range from 80
km to 45 km. These links are affected by multipath
fading.
9. The frequency of operation of these links is
usually from 11 GHz to 20 GHz. Depending upon
the climatic conditions and frequency of operation,
the hop length can vary between 40 km and 20
km. These links are also affected by multipath
fading and rain fading.
10. These links operate in high frequency ranges
(23–58 GHz) and thereby cover shorter
distances. At lowerfrequency ranges in this
band, links are affected by both multipath and
rain fading. At higher frequencies,when the hop
length is only a few kilometres, the multipath
phenomenon does not have a significant effect.
However, the impact of rain is quite severe.
11.
12. Above figure shows a simple microwave link.
Major components that constitute a microwave
link are:
(a) Indoor unit
(b) Outdoor unit
(c) Antenna
(d) RF low loss cables/Waveguide
(e) Microwave tower
13. Also called IDU, it usually contains the radio modem; i.e.
it acts as a termination point which convert the signal
into a radio signal sent across the microwave link, using
modulation schemes.
Indoor units are usually located in a protected
environment, i.e. within cabinets inside a building or
similar structure.
They are not exposed to the environmental conditions
like the outdoor units.
15. It converts the modulated low frequency signal into a
high frequency radio signal. The OU contains radio
frequency transmitters and receivers. Due this feature, it
is also known as a radio transceiver.
The received signal usually passes the low noise
amplifier (LNA), which strengthens the weak signals.
This is followed by automatic gain control (AGC), which
ensures equality of the signal strength when entering the
radio receiver.
The OU gets electrical power and the low frequency
modulated signal from the IU through coaxial cable/
waveguides connections
16. An antenna interacts with free space; hence its
understanding becomes critical for the microwave link
planning engineers. An antenna is defined as the structure
that transfers the electromagnetic energy from the free
space into transmission lines and vice versa.
There are many types of antennas: horn, parabolic, flat or
planar, lens, yagi, array, etc.
The application of the antenna depends upon its electrical
and mechanical characteristics.
17. RF low loss cables are used for 6/7GHz link.
Cables are limited to pass the high frequency
because its lumped component L and C form LPF
circuit.
Waveguide are used for 15/18GHz link.
It has the capability to pass the high frequency
because its depends on the dimension of
waveguide.
18. Earth’s atmosphere plays a vital role in the
propagation of microwaves.
the atmosphere contains several minute layers,
each having its own pressure, temperature and
water vapour content.
Refractive index of a particular media can be
defined as
19. As pressure, temperature and humidity all change
with height, the refractive index also changes with
height, as refractivity varies with pressure,
temperature and humidity. This also means that
the radio refractivity N also changes with height:
N ∝ η (3.12)
η= 1.000 300
20.
21. We can define K Factor using above information
K-Factor = R / R`
where
R = Radius of ray beam curvature
R` = Radius of earth
K=4/3 for earth's atmosphere.
Fig. shows value of K according to path traveled
by MW wave.
23. • Vertical Polarization is less affected by rain fading. Rain
droplets are generally flattened with increase in size and
thus Vertical polarization is less affected.
• However, horizontal polarization is very much used to
avoid interference but they are more prone to rain
fading, in case nearby areas are using Vertical
Polarization.
24. So, vertical polarization is generally used for high
frequency links, because high frequencies are
less affected by rain fading and horizontal
polarization is generally used to avoid
interference. However, this cannot be treated as
rule. Each operator is free to decide.
25. Diversity in MW Links is a sort of redundancy in
network. They also help overcome various factors
which affect MW links.
In regions where multipath fading conditions exist,
it is necessary to incorporate diversity into the
system design.
Two types of Diversity in MW links
1. Frequency Diversity
2. Space Diversity
26. • Frequency Diversity calls for use of two different
frequencies for same MW link. This is normally avoided
because two frequency allocation means double the
annual fee payable for frequency. Frequency diversity is
generally meant to overcome frequency interferences
and various other factors.
27. • Space Diversity uses two MW antennas at each side
and is best suited to overcome Reflection of MW
waves. Signal is received by both antennas called
Main Antenna and Diversity Antenna. This diversity
also helps a lot in areas of high wind because if one
antenna gets misaligned, network can function
without fail from another.
Note:-
Neither space diversity nor frequency diversity
provides any improvement or protection against rain
attenuation.
28. • From the figure above we can see that apart from
direct line of sight (LOS) we need to leave some
space above and below it to allow deviation of MW
wave from its original path. Fresnel zone is nothing
but distance below and above a point which should be
clear for LOS communication.
Fig :MW Communication
29.
30. where
rn = radius of fresnel zone. Generally we consider
n=1 i.e. first fresnel zone clearance.
d1 = distance of point from Point A
d2 = distance of point from Point B
34. Now we will see link budget of MW link i.e. we will
analyze gains and losses and calculate received
power at other end.
Fig : Link Budget for MW Link
35. • From Fig. it can be seen clearly that received
power at Point B can be calculated as
• RxA = TxA + GA - Lfs - Arain + GB
where
• TxA = Transmit Power
• GA = Gain of Antenna A
• Lfs = Free Space Loss
• Arain = Attenuation due to rain
• GB = Gain of Antenna B
36. A microwave link frequently is used to transmit
signals in instances in which it would be
impractical to run cables.
If you need to connect two networks separated by
a public road,
for example, you might find that regulations
restrict you from running cables above or below
the road. In such a case, a microwave link is an
ideal solution.
37. • In areas with lots of rain, use the lowest frequency
band to handle such projects.
• Microwave hops over or in the vicinity of the large
water surfaces and flat land areas can cause
severe multipath fading. Reflections may be
avoided by selecting sites that are shielded from
the reflected rays.
• Hot and humid coastal areas