Antennas in 50 minutes or less
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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!

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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


Antennas in 50 minutes or less

The University of Utah mm-resolution Head Model

Furse, Lazzi, Gandhi, “FDTD Computation of Power Deposition in the Head for Cellular Telephones,” Proc. 1996 IEEE APS Symposium


Applications cellular telephones

Applications: Cellular Telephones

SAR Distribution in Adult

- 835 MHz

- Simplified Phone Model

- l /4 antenna

Pandit,McDermott,Lazzi,Furse,Gandhi, “Electrical Energy Absorption in the Human Head,” presented at IEEE Visualization ‘96, S.F., CA 1996


Antennas in 50 minutes or less

SAR Distributions - 835 MHz (adult, 10 year old, 5 year old)

10 year

old

Adult

5 year

old

From: Gandhi, Lazzi, Furse, IEEE Trans. MTT

44(10) 1996


Monopole antenna above ground dipole antenna

Monopole Antenna above Ground =Dipole Antenna


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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