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Antennas -- in 50 Minutes or Less!. Cynthia Furse Department of Electrical and Computer Engineering Utah State University [email protected] Introduction to Antennas. Antenna Parameters Types of Antennas Where to find out more. Antenna Parameters. Radiation Pattern Directivity Gain

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Antennas in 50 minutes or less

Antennas -- in 50 Minutes or Less!

Cynthia Furse

Department of Electrical and Computer Engineering

Utah State University

[email protected]


Introduction to antennas
Introduction to Antennas

  • Antenna Parameters

  • Types of Antennas

  • Where to find out more


Antenna parameters
Antenna Parameters

  • Radiation Pattern

    • Directivity

    • Gain

    • Planes ( E or H, Elevation or Azimuth)

    • Lobes (HPBW, FSLBW, etc.)

  • Input Impedance

  • Link Budget


Common types of antennas
Common Types of Antennas

  • Wire Antennas

    • Dipoles, Monopoles, Monopoles above Gnd

  • Patch, Printed circuit board antennas

  • Slots, apertures

  • Dishes, Reflector Antennas

  • Arrays


Dipole antenna
Dipole Antenna

From:http://www.qth.com/antenna/dipole.gif,plot.gif


Folded dipole
Folded Dipole

From:http://www.qth.com/antenna/fdipole.gif


Monopole antenna
Monopole Antenna

From: http://www.letstalk.com//Images/mits-ah-129.GIF


Monopole antenna1
Monopole Antenna

From:http://www.letstalk.com//Images/5-a.gif



V antenna
V-Antenna

v.gif

From:http://www.qth.com/antenna/v.gif


Loop antenna
Loop Antenna

From:http://www.downeastmicrowave.com/graphics/kbloop.gif


Pagers
Pagers

From: http://www.letstalk.com//Images/13-a.gif


Discone antenna
Discone Antenna

From: http://www.northcountryradio.com/discfig.htm


Reflector dish antenna
Reflector (Dish) Antenna

From: http://www.dssdirectv.com/chanmas1.jpg


Arecibo observatory puerto rico
Arecibo Observatory -- Puerto Rico

From: http://www.naic.edu/about/photos/aoviews/tescop.jpg


Arecibo observatory
Arecibo Observatory

From:http://www.naic.edu/about/photos/aoviews/wideao.jpg


Arecibo observatory1
Arecibo Observatory

From: http://www.naic.edu/about/photos/aoviews/tescop4.jpg


Horn antennas
Horn Antennas

From: http://www.tmo.hp.com/tmo/datasheets/Images/img-HP11966J-1lg.gif


Conical horn antenna
Conical Horn Antenna

From: http://www.afcsat.com/CH14_MOT2.jpg


Gps antennas
GPS Antennas

From:http://www.lowe.co.uk/gpsant.jpg


Gps antenna
GPS Antenna

SEN 67157549

SENSOR SYSTEMS L1

From:http://gracie.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL/Models/Images/SENS67157549.s.jpg


Gps antenna with choke ring
GPS Antenna with Choke Ring

SEN 67157549+cr

SENSOR SYSTEMS L1 WITH CHOKE RING

From:http://gracie.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL/Models/Images/SENS671575+cr.s.jpg


Gps antenna1
GPS Antenna

LEI AT302

From:http://gracie.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL/Models/LEI_AT302.shtml


Antenna arrays
Antenna Arrays

Two Elements -- Pattern adds

constructively or destructively

From: http://server5550.itd.nrl.navy.mil/projects/HAARP/images/ant/pat1.gif


Antenna arrays1
Antenna Arrays

More Elements:

Higher Directivity

Sidelobes

From: http://server5550.itd.nrl.navy.mil/projects/HAARP/images/ant/pat2.gif


Scanning antenna array
Scanning Antenna Array

Changing the phases on the element

feeds can make a scanning array.

From:http://server5550.itd.nrl.navy.mil/projects/HAARP/images/ant/pat3.gif


Arrays
Arrays

From:http://www.qth.com/antenna/tiny2rl.gif


Yagi uda arrays
Yagi-Uda Arrays

From: http://cust.iamerica.net/dwhowell/yagimax.jpg


Satellite antenna array
Satellite Antenna Array

From:http://www.qth.com/antenna/hfsatrl.gif


Haarp observatory
HAARP Observatory

HAARP (High frequency Active Auroral Research Program) is to be a major Arctic facility for upper atmospheric and solar-terrestrial research. HAARP is being built on a DoD-owned site near Gakona, Alaska.

From:http://server5550.itd.nrl.navy.mil/projects/HAARP/images/ohd.jpg


Haarp antenna array
HAARP Antenna Array

The HF antenna system to be used for Active Ionospheric Research at the HAARP site will assist other facility instruments in the study the overhead ionosphere. As a result, it too has been designed to optimize or restrict the transmission pattern to lie within a narrow overhead region. To achieve this desirable antenna pattern, the HAARP system uses an "array" of individual antenna elements. The HAARP antenna array is similar or identical to many other types of directive antenna types in use for both military and civilian applications including air traffic control radar systems, long range surveillance systems, steerable

communication systems and navigation systems.

From:http://server5550.itd.nrl.navy.mil/projects/HAARP/images/twr/pan2.jpg


Haarp feed sytem
HAARP -- Feed Sytem

From:http://server5550.itd.nrl.navy.mil/projects/

HAARP/images/ant/tpile.jpg


Haarp matching networks
HAARP -- Matching Networks

From: http://server5550.itd.nrl.navy.mil/projects/HAARP/images/ant/amu.jpg


Corner reflector antenna
Corner Reflector Antenna

From: http://www.northcountryradio.com/crfigs.htm


Anything radiates fan tenna
Anything Radiates …Fan-tenna

From:http://www.qth.com/antenna/fanfull.gif


The bottom line
The Bottom Line

  • ANYTHING radiates. Sometimes you want it to, and sometimes you don’t.

  • To choose an antenna for your design, prepare a LINK BUDGET to determine the necessary gain and directivity of your antenna.

  • Don’t forget MATCHING NETWORKS to prevent reflection between your antenna and your circuit.


Antenna references on the web
Antenna References on the Web

General: http://www.ee.surrey.ac.uk/Personal/D.Jefferies/antennas.html

GPS Antennas

Lowe Industries :http://www.lowe.co.uk/antrev2.htmlhttp://www.lowe.co.uk/antrev2.html

Antenna Calibration: http://gracie.grdl.noaa.gov/GRD/GPS/Projects/ANTCAL/index.shtml

Ham:

North Country Radio: http://www.northcountryradio.com/techtips.htm

Antenna Elmer: http://www.qth.com/antenna/antenna.htm

HAARP Observatory: http://server5550.itd.nrl.navy.mil/projects/HAARP/ant3.html

Arecibo Obervatory: http://www.naic.edu/aboutao.htm


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