OneStopGate.Com
OnestopGate   OnestopGate
   Tuesday, December 3, 2024 Login  
OnestopGate
Home | Overview | Syllabus | Tutorials | FAQs | Downloads | Recommended Websites | Advertise | Payments | Contact Us | Forum
OneStopGate

GATE Resources
Gate Articles
Gate Books
Gate Colleges 
Gate Downloads 
Gate Faqs
Gate Jobs
Gate News 
Gate Sample Papers
Training Institutes

GATE Overview
Overview
GATE Eligibility
Structure Of GATE
GATE Coaching Centers
Colleges Providing M.Tech/M.E.
GATE Score
GATE Results
PG with Scholarships
Article On GATE
Admission Process For M.Tech/ MCP-PhD
GATE Topper 2012-13
GATE Forum




GATE 2025 Exclusive
Organizing Institute
Important Dates
How to Apply
Discipline Codes
GATE 2025 Exam Structure

GATE 2025 Syllabus
Aerospace Engg..
Agricultural Engg..
Architecture and Planning
Chemical Engg..
Chemistry
Civil Engg..
Computer Science / IT
Electronics & Communication Engg..
Electrical Engg..
Engineering Sciences
Geology and Geophysics
Instrumentation Engineering
Life Sciences
Mathematics
Mechanical Engg..
Metallurgical Engg..
Mining Engg..
Physics
Production & Industrial Engg..
Pharmaceutical Sciences
Textile Engineering and Fibre Science

GATE Study Material
Aerospace Engg..
Agricultural Engg..
Chemical Engg..
Chemistry
Civil Engg..
Computer Science / IT
Electronics & Communication Engg..
Electrical Engg..
Engineering Sciences
Instrumentation Engg..
Life Sciences
Mathematics
Mechanical Engg..
Physics
Pharmaceutical Sciences
Textile Engineering  and Fibre Science

GATE Preparation
GATE Pattern
GATE Tips N Tricks
Compare Evaluation
Sample Papers 
Gate Downloads 
Experts View

CEED 2013
CEED Exams
Eligibility
Application Forms
Important Dates
Contact Address
Examination Centres
CEED Sample Papers

Discuss GATE
GATE Forum
Exam Cities
Contact Details
Bank Details

Miscellaneous
Advertisment
Contact Us


Home » GATE Study Material » Electronics and Telecommunication » Antennas

Antennas

Looking for GATE Preparation Material? Join & Get here now!

** Gate 2013 Question Papers.. ** CEED 2013 Results.. ** Gate 2013 Question Papers With Solutions.. ** GATE 2013 CUT-OFFs.. ** GATE 2013 Results.. **

Antennas

Antenna, RF feeder and RF connector topics



RF antennas (or aerials) are an essential element of any radio communications link, whether it is for a high power transmitter like those used for broadcasting, or low power ones like those used wireless technologies such as WLAN or remote control and sensing applications.
Apart from the power levels, RF antennas are used across the whole radio spectrum, from ELF right up to the microwave bands. Whatever the power, and the frequency, the basic RF antenna design theory remains the same, although the practical approach has to change to meet the differenting mechanical requirements.

Although RF antenna design and theory can involve a considerable amount of involved mathematics, there is much that can be achieved with only a minimum of mathematics, and most RF antenna engineers do not need a Ph.D in advanced calculus.


RF Antenna Basics


Electromagnetic waves and basic antenna operation
Polarisation
impedance - including radiation resistance, loss resistance and efficiency
Resonance and bandwidth
Directivity and gain


Feeders


The ideal position for an antenna is rarely in the optimum position for the transmitting or receiving equipment. As a result a form of transmission line or feeder is required to transfer the signals and power to and from the antenna.

Coaxial feeder
Coax cable loss or attenuation the reasons for it and how to minimise it.
Coax cable power rating
Coax cable velocity factor
RF coax cable data and specifcations
Environmental factors relating to coax cables
Balanced feeder
Waveguide basics
Waveguide data
Antenna RF diplexer - although not a feeder, a diplexer is sometimes included in the feed system of an antenna.
 

RF coax cable connectors

A wide variety of RF connectors are available for making connections to coaxial cable. These connectors including BNC, C-type, N-type, UHF (Amphenol) connector, SMA, SMB, SMC and many more are able to be used in a variety of applications.

Coax cable connectors - general overview
BNC connector
TNC connector
C-Type connector
N-Type connector
SMA connector
SMB connector
UHF connector
 

The dipole antenna


The dipole antenna is one of the most basic forms of antenna available. It is widely used on its own, and it is also used as the "driven" element in many other types of antenna.

The dipole antenna
Folded dipole
 

The vertical antenna


Vertical antennas are widely used in many areas, and are particularly widely used for mobile applications because they radiate all around them in the horizontal plane. This means that they do not need redirecting as the mobile station moves. The quarter wave vertical is the simplest, but there are many other designs that provide improved performance and gain.

Quarter wave vertical
Five eighths wavelength vertical
J pole vertical antenna

Directional antennas


There is a good variety of different types of directive antenna that can be used. Although the yagi antenna is the most popular, it is by no means the only one, and other designs and approaches are more applicable in many instances.

Yagi
Log periodic beam antenna
Parabolic reflector
Horn antenna
 

Wideband antennas


Most antennas are only able to operate over a narrow bandwidth. There are some techniques that enable the bandwidth of an antenna to be increased considerably, and also some desgigns that are able to operate over very wide bandwidths.

Discone
Log periodic beam antenna
 

Loop antennas


Where directivity and small size are required, loop antennas may often provide an answer. Although different types of loop have slightly different properties, they are able to provide a good antenna solution in many circumstances.

Loop antenna overview
Ferrite rod antenna
 

Applications


Antennas can be used in many applications from reception of terrestrial and satellite television to point to point radio, short wave radio and much more.

Satellite antennas for satellite television and other satellite applications
 

Antenna installation


When installing an antenna many points must be considered. Location, type of antenna, method of installation and many other items all affect the antenna installation. Safety is also a crucial element because if the antenna is not installed correctly the antenna may collapse.

Antenna height
Antenna installation materials - choosing the correct materials to minimise corrosion
How to install coax cable - some key points to note



Discussion Center

Discuss/
Query

Papers/
Syllabus

Feedback/
Suggestion

Yahoo
Groups

Sirfdosti
Groups

Contact
Us

MEMBERS LOGIN
  
Email ID:
Password:

  Forgot Password?
 New User? Register!

INTERVIEW EBOOK
Get 9,000+ Interview Questions & Answers in an eBook. Interview Question & Answer Guide
  • 9,000+ Interview Questions
  • All Questions Answered
  • 5 FREE Bonuses
  • Free Upgrades
GATE RESOURCES
 
  • Gate Books
  • Training Institutes
  • Gate FAQs
  • GATE BOOKS
     
  • Mechanical Engineeering Books
  • Robotics Automations Engineering Books
  • Civil Engineering Books
  • Chemical Engineering Books
  • Environmental Engineering Books
  • Electrical Engineering Books
  • Electronics Engineering Books
  • Information Technology Books
  • Software Engineering Books
  • GATE Preparation Books
  • Exciting Offers



    GATE Exam, Gate 2009, Gate Papers, Gate Preparation & Related Pages


    GATE Overview | GATE Eligibility | Structure Of GATE | GATE Training Institutes | Colleges Providing M.Tech/M.E. | GATE Score | GATE Results | PG with Scholarships | Article On GATE | GATE Forum | GATE 2009 Exclusive | GATE 2009 Syllabus | GATE Organizing Institute | Important Dates for GATE Exam | How to Apply for GATE | Discipline / Branch Codes | GATE Syllabus for Aerospace Engineering | GATE Syllabus for Agricultural Engineering | GATE Syllabus for Architecture and Planning | GATE Syllabus for Chemical Engineering | GATE Syllabus for Chemistry | GATE Syllabus for Civil Engineering | GATE Syllabus for Computer Science / IT | GATE Syllabus for Electronics and Communication Engineering | GATE Syllabus for Engineering Sciences | GATE Syllabus for Geology and Geophysics | GATE Syllabus for Instrumentation Engineering | GATE Syllabus for Life Sciences | GATE Syllabus for Mathematics | GATE Syllabus for Mechanical Engineering | GATE Syllabus for Metallurgical Engineering | GATE Syllabus for Mining Engineering | GATE Syllabus for Physics | GATE Syllabus for Production and Industrial Engineering | GATE Syllabus for Pharmaceutical Sciences | GATE Syllabus for Textile Engineering and Fibre Science | GATE Preparation | GATE Pattern | GATE Tips & Tricks | GATE Compare Evaluation | GATE Sample Papers | GATE Downloads | Experts View on GATE | CEED 2009 | CEED 2009 Exam | Eligibility for CEED Exam | Application forms of CEED Exam | Important Dates of CEED Exam | Contact Address for CEED Exam | CEED Examination Centres | CEED Sample Papers | Discuss GATE | GATE Forum of OneStopGATE.com | GATE Exam Cities | Contact Details for GATE | Bank Details for GATE | GATE Miscellaneous Info | GATE FAQs | Advertisement on GATE | Contact Us on OneStopGATE |
    Copyright © 2024. One Stop Gate.com. All rights reserved Testimonials |Link To Us |Sitemap |Privacy Policy | Terms and Conditions|About Us
    Our Portals : Academic Tutorials | Best eBooksworld | Beyond Stats | City Details | Interview Questions | India Job Forum | Excellent Mobiles | Free Bangalore | Give Me The Code | Gog Logo | Free Classifieds | Jobs Assist | Interview Questions | One Stop FAQs | One Stop GATE | One Stop GRE | One Stop IAS | One Stop MBA | One Stop SAP | One Stop Testing | Web Hosting | Quick Site Kit | Sirf Dosti | Source Codes World | Tasty Food | Tech Archive | Software Testing Interview Questions | Free Online Exams | The Galz | Top Masala | Vyom | Vyom eBooks | Vyom International | Vyom Links | Vyoms | Vyom World
    C Interview Questions | C++ Interview Questions | Send Free SMS | Placement Papers | SMS Jokes | Cool Forwards | Romantic Shayari