03/23/22 Antenna Presentation: Carp,Ontario 1 Family Tree of Antennas Family Tree of Antennas David Conn David Conn VE3KL VE3KL • Acknowledgements Acknowledgements • Doug Leach VE3XK Doug Leach VE3XK • Bert Barry VE3QAA Bert Barry VE3QAA • QCWA Members QCWA Members • The Inventors The Inventors • References given in References given in slides slides • ARRL Antenna book ARRL Antenna book
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10/5/2015Antenna Presentation: Carp,Ontario1 Family Tree of Antennas David Conn VE3KL Acknowledgements Acknowledgements Doug Leach VE3XK Doug Leach VE3XK.
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04/19/23 Antenna Presentation: Carp,Ontario 1
Family Tree of AntennasFamily Tree of AntennasDavid ConnDavid Conn VE3KL VE3KL
• AcknowledgementsAcknowledgements • Doug Leach VE3XKDoug Leach VE3XK• Bert Barry VE3QAABert Barry VE3QAA• QCWA MembersQCWA Members• The InventorsThe Inventors• References given in References given in
slidesslides• ARRL Antenna bookARRL Antenna book
04/19/23 Antenna Presentation: Carp,Ontario 2
Why Make a Family TreeWhy Make a Family Tree
• To understand the overall (complex) To understand the overall (complex) picturepicture
• To enable us to select a good antennaTo enable us to select a good antenna
• To organize and compare existing To organize and compare existing designsdesigns Antenna Types
4.4. Small Loops/Wires: Resonant Loading Small Loops/Wires: Resonant Loading CircuitsCircuits
04/19/23 Antenna Presentation: Carp,Ontario 4
Antenna Types 1…6Antenna Types 1…6
5.5. Phased Arrays: Yagi, Collinear, Sterba Phased Arrays: Yagi, Collinear, Sterba Curtain, Rhombic, Four Element Curtain, Rhombic, Four Element Rectangular Array, Many Others …Rectangular Array, Many Others …
6.6. Lens Antennas for UHF/Microwaves: Lens Antennas for UHF/Microwaves: Parabolic Dish, HelixParabolic Dish, Helix … …
Family Tree
04/19/23 Antenna Presentation: Carp,Ontario 5
Amateur Radio
Antennas(index)
RadiationWavesCircuits
Ground/IonosphereTransmission Lines
Simulation/Smith Chart
Receiving AntennasSNR
HFUHF/VHFMF
Microwave
Transmitting AntennasPower
04/19/23 Antenna Presentation: Carp,Ontario 6
Transmitting AntennasTransmitting Antennas
• Performance measured by Gain & Performance measured by Gain & Directivity Directivity
• Polarization (Vertical for MF Transmitters)Polarization (Vertical for MF Transmitters)
04/19/23 Antenna Presentation: Carp,Ontario 7
Receiving Antennas…SNRReceiving Antennas…SNR
• Performance measured by RDF (dB)Performance measured by RDF (dB)
• RDF (Receiving Directivity Factor) defined RDF (Receiving Directivity Factor) defined as peak response in desired direction to as peak response in desired direction to average response in all directions average response in all directions
• Ground/Ionosphere… extremely importantGround/Ionosphere… extremely important
• Consider Polarization: VHF weak signal Consider Polarization: VHF weak signal (DX) uses Horizontal Polarization(DX) uses Horizontal Polarization
Antenna ExamplesAntenna Examples
04/19/23 Antenna Presentation: Carp,Ontario 8
MF AntennasMF AntennasNeed good S/N…not Gain for ReceiveNeed good S/N…not Gain for Receive
• Inverted L, TInverted L, T• Beverage Antenna… the best?Beverage Antenna… the best?• Terminated loops (Pennant, Flag)Terminated loops (Pennant, Flag)• Vertical Phased ArraysVertical Phased Arrays• Vertical GP antennasVertical GP antennas• K9AY LoopK9AY Loop• 4 Square Vertical4 Square Vertical
Green indicates Receive Only AntennaGreen indicates Receive Only Antenna
armarm• Terminated loop classTerminated loop class
04/19/23 Antenna Presentation: Carp,Ontario 17
Small Magnetic Loop Antenna: type 4Small Magnetic Loop Antenna: type 4Very High VoltagesVery High Voltages
http://www.g3ycc.karoo.net/loop.htm
04/19/23 Antenna Presentation: Carp,Ontario 18
Microwave Antenna Array: type 5 & 6Microwave Antenna Array: type 5 & 6Space DiversitySpace Diversity
Transmitter ReceiversWanted Rays
Unwanted Rays
Arrays
04/19/23 Antenna Presentation: Carp,Ontario 19
Arrays AntennasArrays Antennas
►Driven arraysDriven arrays: Collinear, Sterba and : Collinear, Sterba and Bobtail Curtains, two dimensional Bobtail Curtains, two dimensional arrays, three dimensional (lens) arrays, three dimensional (lens) arrays, Log Periodicarrays, Log Periodic
End fire or broadside or End fire or broadside or anyany beam shape beam shape
►Parasitic arraysParasitic arrays: Yagi: Yagi
04/19/23 Antenna Presentation: Carp,Ontario 20
Linear Arrays (Driven)Linear Arrays (Driven)Directivity increases with LengthDirectivity increases with Length
04/19/23 Antenna Presentation: Carp,Ontario 21
Four Element Rectangle.. Easy to Four Element Rectangle.. Easy to VisualizeVisualize
ARRL Antenna Book
04/19/23 Antenna Presentation: Carp,Ontario 22
Collinear ArraysCollinear Arrays
http://www.tpub.com/neets/book10/42i.htm
04/19/23 Antenna Presentation: Carp,Ontario 23
Bobtail Curtain Driven ArrayBobtail Curtain Driven ArrayMaximum Gain 4.5 dBiMaximum Gain 4.5 dBiLow Angle RadiationLow Angle Radiation
ARRL Antenna Book
04/19/23 Antenna Presentation: Carp,Ontario 24
Log Periodic Antenna Array…looks like a Log Periodic Antenna Array…looks like a tapered Yagi but each element is driventapered Yagi but each element is driven
► Very Broad BandVery Broad Band► Dimensions repeat Dimensions repeat