Family tree of antennas david conn ve3kl
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Family Tree of Antennas David Conn VE3KL PowerPoint PPT Presentation


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Family Tree of Antennas David Conn VE3KL. Acknowledgements. Doug Leach VE3XK Bert Barry VE3QAA QCWA Members The Inventors References given in slides ARRL Antenna book. Why Make a Family Tree. To understand the overall (complex) picture To enable us to select a good antenna

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Family Tree of Antennas David Conn VE3KL

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Family tree of antennas david conn ve3kl

Family Tree of AntennasDavid Conn VE3KL

Acknowledgements

Doug Leach VE3XK

Bert Barry VE3QAA

QCWA Members

The Inventors

References given in slides

ARRL Antenna book

Antenna Presentation: Carp,Ontario


Why make a family tree

Why Make a Family Tree

  • To understand the overall (complex) picture

  • To enable us to select a good antenna

  • To organize and compare existing designs

Antenna Types

Antenna Presentation: Carp,Ontario


Antenna types 1 6

Antenna Types 1…6

  • Resonant Wires: Dipole, Yagi, Quad, Vertical, Moxon Square …….

  • Long wires (non-resonant): Zepp/G5RV…

  • Resistively Loaded: Beverage, Pennant, Rhombic …

  • Small Loops/Wires: Resonant Loading Circuits

Antenna Presentation: Carp,Ontario


Antenna types 1 61

Antenna Types 1…6

5. Phased Arrays: Yagi, Collinear, Sterba Curtain, Rhombic, Four Element Rectangular Array, Many Others …

  • Lens Antennas for UHF/Microwaves: Parabolic Dish, Helix …

Family Tree

Antenna Presentation: Carp,Ontario


Family tree of antennas david conn ve3kl

Radiation

Waves

Circuits

Transmission Lines

Ground/Ionosphere

Transmitting Antennas

Power

Receiving Antennas

SNR

Amateur Radio

Antennas

(index)

Simulation/Smith Chart

Microwave

UHF/VHF

MF

HF

Antenna Presentation: Carp,Ontario


Transmitting antennas

Transmitting Antennas

  • Performance measured by Gain & Directivity

  • Low Loss: Transmitter Matching

  • SWR of 2:1 loses half the power

  • Ground/Ionosphere… dominates

  • Polarization (Vertical for MF Transmitters)

Antenna Presentation: Carp,Ontario


Receiving antennas snr

Receiving Antennas…SNR

  • Performance measured by RDF (dB)

  • RDF (Receiving Directivity Factor) defined as peak response in desired direction to average response in all directions

  • Ground/Ionosphere… extremely important

  • Consider Polarization: VHF weak signal (DX) uses Horizontal Polarization

Antenna Examples

Antenna Presentation: Carp,Ontario


Mf antennas need good s n not gain for receive

MF AntennasNeed good S/N…not Gain for Receive

  • Inverted L, T

  • Beverage Antenna… the best?

  • Terminated loops (Pennant, Flag)

  • Vertical Phased Arrays

  • Vertical GP antennas

  • K9AY Loop

  • 4 Square Vertical

    Green indicates Receive Only Antenna

Antenna Presentation: Carp,Ontario


Inverted l t vertical k9ay antennas

Inverted L,T,Vertical,K9AY Antennas

http://www.antennex.com/preview/archive3/ltv.htm

http://www.aytechnologies.com/TechData/LoopInstall.htm

Antenna Presentation: Carp,Ontario


Mf receiving antenna performance

MF Receiving Antenna Performance

RDF, dB

Vertical phased array B/S

13

2 Broadside Beverages 1.75 W

Good

Beverage 1.0 W

8.64

Small 4X4 Square

Dipole

Flag/Pennant

K9AY

80 m high

Vertical Omni

Beverage 0.5 W

Bad

5.0

Cost

Antenna Presentation: Carp,Ontario

Low Dipole

http://www.w8ji.com/antennas.htm


Classic dipole type 1 elevation plot

Classic Dipole: type 1 .. Elevation Plot

35 feet

Ground

RDF = 8.3 dB Good

Antenna Presentation: Carp,Ontario


Classic dipole type 1 azimuth plot

Classic Dipole: type 1 .. Azimuth Plot

Antenna Presentation: Carp,Ontario


Classic vertical ground plane type 1

Classic Vertical Ground Plane: type 1

RDF =5 dB

Antenna Presentation: Carp,Ontario


Two element quad azimuth type 1

Two Element Quad…Azimuth: type 1

RDF = 12.84 dB…high

31 feet high to top

Antenna Presentation: Carp,Ontario


End fed zepp antenna type 2

End Fed Zepp Antenna: type 2

Antenna Presentation: Carp,Ontario


Mf pennant receive only type 3

MF Pennant…Receive only: type 3

  • Ground independent

  • Very Low Gain (-35 dB)

  • RDF = 7.39 dB…OK

  • Cardoid pattern

  • F/B 25 dB

  • Small..20 feet each arm

  • Terminated loop class

Antenna Presentation: Carp,Ontario


Small magnetic loop antenna type 4 very high voltages

Small Magnetic Loop Antenna: type 4Very High Voltages

http://www.

g3ycc.karoo.net/loop.htm

Antenna Presentation: Carp,Ontario


Microwave antenna array type 5 6 space diversity

Microwave Antenna Array: type 5 & 6Space Diversity

Transmitter

Receivers

Wanted Rays

Unwanted Rays

Arrays

Antenna Presentation: Carp,Ontario


Arrays antennas

Arrays Antennas

  • Driven arrays: Collinear, Sterba and Bobtail Curtains, two dimensional arrays, three dimensional (lens) arrays, Log Periodic

    • End fire or broadside or any beam shape

  • Parasitic arrays: Yagi

Antenna Presentation: Carp,Ontario


Linear arrays driven directivity increases with length

Linear Arrays (Driven)Directivity increases with Length

Antenna Presentation: Carp,Ontario


Four element rectangle easy to visualize

Four Element Rectangle.. Easy to Visualize

ARRL Antenna Book

Antenna Presentation: Carp,Ontario


Collinear arrays

Collinear Arrays

http://www.tpub.com/neets/book10/42i.htm

Antenna Presentation: Carp,Ontario


Bobtail curtain driven array maximum gain 4 5 dbi low angle radiation

Bobtail Curtain Driven ArrayMaximum Gain 4.5 dBiLow Angle Radiation

ARRL Antenna Book

Antenna Presentation: Carp,Ontario


Log periodic antenna array looks like a tapered yagi but each element is driven

Log Periodic Antenna Array…looks like a tapered Yagi but each element is driven

  • Very Broad Band

  • Dimensions repeat logarithmically

  • QST Sept. 2002

ARRL Antenna Book

Antenna Presentation: Carp,Ontario


Vhf uhf microwave antennas

VHF/UHF/Microwave Antennas

  • Yagi, Quagi, Quads ….stacked versions

  • Cycloid Dipole…

    Circular Polarization..Repeaters

  • Helix and Helix Arrays

  • Vertical, Jpole

  • Corner Reflectors, Parabolas, Lenses

  • Circuit board patch antenna arrays

Antenna Presentation: Carp,Ontario


The j pole antenna type 1

The J Pole Antenna: type 1

  • Easy to Build

  • No ground plane needed

  • Many designs available

http://www.cebik.com/jp2.html

Antenna Presentation: Carp,Ontario


Cycloid dipole circular polarization repeaters type 1

Cycloid DipoleCircular Polarization…Repeaters: type 1

http://www.wa7x.com/cycloid_info.html

Antenna Presentation: Carp,Ontario


Summary

Summary

  • Tree must include antenna design as well as the physical description

  • Tree must include: ground effects, basics of the ionosphere

  • Tree must link to the most important well proven designs

  • Tree must help amateurs at all levels to select an appropriate antenna

Antenna Presentation: Carp,Ontario


Many thanks especially to the organizers

Many Thanks: Especially to the Organizers

http://www.dxlc.com/solar/

Antenna Presentation: Carp,Ontario


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