Do It Yourself
(DIY) ANTENNA How to build and
test your own Wi-Fi and WLAN Antenna |
Tin Can Feed |
Click
on the headings below ANTENNAS AMPLIFIERS PROPAGATION Topics |
Sponsors Links ********************* |
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PROPAGATION: | |||
WI-FI
ANTENNA RANGE Standard Wi-Fi or WLAN equipment can be improved by adding "high gain" antenna. The gain of the antenna at each end of a link multiply together and this table attempts to conservatively indicate how far you can expect to get a FULL SPEED CONNECTION by increasing the "gain" of the antenna used at each end of the link. Henry O'Tani (G8OTA) |
TABLE OF EFFECTIVE RANGES OF HIGH
GAIN ANTENNA
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RAIN ATTENUATION |
NOTES on 802.11 rain attenuation
from John Waters |
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G4HFQ POLAR PLOTTING PROGRAM PolarPlot is a
program that lets you see what the polar diagram in knowing more about their beam antennas. You can download
and try out PolarPlot to see if you like the look of it. With
PolarPlot you can measure the polar diagram of the
antenna |
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localmap.exe
View.exe
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G4JNT Microwave Broadband (ATV) path prediction program for PCs A
set of Public Domain programs for plotting microwave
(broadband amateur Mainland Britain only. MicroSoft DOS or Windows. http://www.wlan.org.uk/downloads/g4jnt-atv.zip Terrain.exe |
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VE2DBE "RADIO MOBILE" path
prediction program for PCs Radio Mobile Version 3.5.4
Radio Propagation and Virtual Mapping Freeware by Elevation data For most of the world is available The software also provides 3D views, stereoscopic views, and animation. Freeware by VE2DBE |
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Getting started in "Radio Mobile" G8GTZ (20/3/2002) |
Getting started in "Radio
Mobile" Radio
Mobile is a fantastic program for predicting links and
radio coverage. However, Download in original Word format Noel - G8GTZ |
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ONLINE Terrain Plot (United Kingdom Only) |
Online Terrain Plot
U.K.
This page is an online implementation of a program
used by UK radio amateurs since 1993. |
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KISMET Features Multiple packet
capture sources |
Kismet 802.11b Wireless Network Sniffer (Linux Based) What is it?
Author: Mike Kershaw (dragorn@kismetwireless.net) http://www.kismetwireless.net/index.shtml 5/2002 |
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Net Stumbler NetStumbler.com is a website
dedicated to wireless networking technology and security
of NetStumbler is a Windows
utility for 802.11b based wireless network auditing
written by March 2004 |
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SMART ID - WFS-1 WI-FI Detector It is becoming increasingly
difficult not to be caught up in WiFi traffic since so
many homes A solution
may be at hand with the appearance of two
"pocket-sized" 802.11 detectors Bob
Rudis March 2004 |
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Understanding Antenna Radiation
Patterns
Understanding
and Using Antenna Radiation Patterns All antennas have
directional qualities. They do not radiate power
equally in all directions. http://www.astronantennas.com/radiation_patterns.html March 2004 |
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Click
on the headings below ANTENNAS AMPLIFIERS PROPAGATION Topics |
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ANTENNA: | |||
CanTenna |
CanTenna - WB8ERJ I have come up with my own version of the classic "cantenna" using 4 inch diameter aluminum dryer vent pipe, and a 4 to 6 inch pipe adapter. Although the basic design is the same as other cantenna type antennas, the materials I ended up using are a bit different. Preliminary results show a gain of 15 DBi. Not bad for less than $10 worth of materials! Mike Thompson WB8ERJ Check out Mike's Web pages: http://wb8erj.home.att.net
March 2004 |
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CIRCULAR WAVEGUIDE ANTENNA |
CIRCULAR WAVEGUIDE ANTENNA We have been experimenting with
waveguide antenna, made from old food cans, to One of the antennas made from a J&B whiskey tin. This was evolved primarily
since the Pringle's can antenna. The Pringle's can, being
Author: spacepleb@psand.net http://flakey.info/antenna/waveguide/ Dec 2004 |
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Amateur Antenna #1 This "15 minute
antenna" is a quarter-wave ground-plane antenna with
trough (Photo only) Estimated gain >8 dBi |
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Amateur Antenna #2 A simple concept, the
"circular waveguide antenna" is repeatable
& easy to These are often
calculated and built as efficient amateur dish feeds. Radproject 2000 |
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Amateur Antenna #3 The simple 2.4GHz Double
Quad Antenna is a compact and easy to make |
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Amateur Antenna #4 The European
"ASTRA" Direct Broadcasting Satellite (DBS)
pole mounted http://www.wlan.org.uk/g8ota double-quad.gif
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Simple 23cm
and 13cm Antenna (by S51KQ and S53MV) |
http://www.qsl.net/ik1hgi/atv/23cmante.htm Please
take notice of our Copyright: for commercial use an
explicit permission is necessary by the respective author
!) |
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2.4GHz Backfire Antenna |
2.4GHz Backfire Antenna " At the point at which I needed to build an external antenna for my modified Compaq WL100 card I was faced with many options. Internet searches reveal many designs for this band, some of which provide really good homebrew details and others that left a little to the imagination!. I was looking for a design that promised reasonable gain without excessive size. The short backfire antenna is not a common antenna, promised 14dBi and looked easy to build. Several designs were found and analysed which did reveal a few discrepancies which seem now that been resolved."
Carl
Rabe - G6NLC Dec 2014 |
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Double Quad (Bow Tie) |
Double Quad * A compact directional antenna useful for workshop and hand-held operation * Fair gain (14 dBi) * Wide bandwidth (full 802.11b/g spectrum) * More compact than Yagi or circular waveguide types of equivalent gain * Fits a wide range of microwave cooking food containers * Ideal as a feed to a standard domestic satellite dish * Liberal mechanical tolerances * useful as reference antenna * Easy to replicate (- but do use correct gauge wire and thickest & best microwave coax you can afford !) * Can use a 120mm CD as a reflector with slightly diminished performance at 2.4GHz * Can omit the "Sleeve Balun" for ordinary Wi-Fi use * Scalable for many frequencies * See equally practical other variants on this page.. Originally from a German Amateur Radio Microwave Compendium design concept of the 1980's this antenna concept has proven popular for broadband Amateur TV and I have made examples of these from 600MHz to 6GHz. It exploits the 6dB gain from solid plane reflector (not everyone knows that ! ) Henry - G8OTA http://www.wlan.org.uk/g8ota double-quad.gif March 2008 |
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DIY 2.4GHz Yagi Antenna |
Easy to Build WIFI 2.4GHz Yagi Antenna"This antenna will extend the range of your WiFi or 2.4GHz devices (like surveillance cameras) into many miles and kilometers. A yagi antenna is basically a telescope for radio waves. I tired the pringle can antenna and the Yagi beats it hands down in performance." http://www.instructables.com/id/Easy-to-Build-WIFI-24GHz-Yagi-Antenna/
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Antcaptenna A printed
circuit 12 dBi version of the Double Quad, The AntCaptenna (ACA) was born from a
desire to make [Ant Caps are used on
wooden stumps in Western Australia, Rob Clark http://www.erlang-software.com/FreeNet http://members.iinet.net.au/~clark/FreeNet/AntCaptenna/ May 2003 |
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DWL-650 | Adding an Antenna for DWL-650
PCMCIA card a short guide to voiding your warranty by: Will Rachelson < will at c0rtex dot com > The DWL-650 I purchased this card
because it was the cheapest (<$100 @ CompUSA). I knew
that |
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Use a Surplus Primestar Dish as an
IEEE 802.11 Wireless Networking Antenna High gain from a simple DIY
project. Uses a circular waveguide feed for |
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Bi Quad Feed for Primestar
Satellite Dish
Author: Trevor Marshall "That's all there is to it, folks -- you now
have a dish with 27-31 dBi of gain http://trevormarshall.com/biquad.htm see below: WLAN Slotted Waveguide Antennas by the same authorTrevAuor |
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Central States VHF Society Antenna Test Reports |
Central States VHF Society - USA The Central States VHF Society has
conducted Antenna Gain
Comparisons can be made
between antennas measured in different http://www.csvhfs.org/CSVHFANT.HTML Nov 2004 |
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OMNI
DIRECTIONAL ANTENNA DESIGN |
Design of a Planar Omnidirectional
Antenna
Randy Bancroft and Blaine Bateman http://www.centurion.com/pdf/wp_omni_wireless.pdf March 2004 |
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EASY HOMEBREW CO-LINEAR OMNI for 2.4GHz | EASY HOMEBREW CO-LINEAR OMNI for 2.4GHz
A 6dBi Vertical Polarised Omnidirectional Antenna An easy step-by-step guide go making a
homemade wireless antenna, for a fraction http://www.amsterdamwireless.net/workshop-15-12/3.html Oct 2003 |
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Satenna Double Quad type satellite dish feed design... The Satenna is a complete unit: 65cm
satellite TV dish, plus SatCap.
You can make your own Satenna by
simply buying or building a SatCap,
Rob Clark http://www.erlang-software.com/FreeNet http://members.iinet.net.au/~clark/FreeNet/index.htm May 2003 |
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Vertically
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Vertical Co-axial Sleeve Co-linear
Array A
vertically polarised omnidirectional co-linear sleeve
dipole array consisting of a number of stacked
omni-directional elements. with about 9dBi gain as shown..... Radproject 2000 |
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Vertically Polarised 6dBi Co-Linear www.guerrilla.net You
have seen them in catalogs for $150 to $250. Now you can
build one for a The collinear antenna was historically used by
repeater sites, stacking various http://www.guerrilla.net/reference/antennas/2ghz_collinear_omni/ |
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Backfire Antenna |
Wlan antenna 2.4 GHz Do-It-Yourself
"My antenna has found been about
2 dB better gain than the Freedom antenna, ( This >14dBi
measured gain should make a good dish feed for an
Ex-Astra European 11 July 2001 Martti Palomaki |
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Circular Polarised |
Circular Polarised Helical Directional Antenna A high
performance circularly polarised directional antenna with
a http://www.wlan.org.uk/helix.gif W0OQC Feb 1998 |
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The "Truth" About
Horizontally Polarized Omni-Directional Antennas There are about 5,000 different
antenna designs in existence. |
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Measured Performance Of The WB0QCD
Alford-Slot Antenna You've seen the ads.
"5.6dBd gain...flat VSWR and good gain bandwidth First, the good
news. The WB0QCD Alford-Slot antenna is a mechanically |
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How to Make a Simple 2.425GHz
Helical Aerial for Wireless ISM Band Devices A comprehensive
and well written DIY constructional article from Australia (excellent case study example) Jason Hecker |
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Improved Helical Antenna Design for
802.11b WLAN - by PA0HOO The
Disappointment The
dimension were OK, all sizes were according to the known
formulas. The Experiment Detailed examination of the antenna design Looking
into detail, there IS a difference between de ordinary
Helix antenna Detailed examination of the antenna design Looking
into detail, there IS a difference between de ordinary
Helix antenna The
main question is, could our PVC plumber tube actually
cause the Study
books say that the traveling velocity is reversed
proportional with It
appears that PVC has a fairly high dielectric
constant. Jan 2003 |
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INEXPENSIVE MULTI-MEGABAUD MICROWAVE DATA
LINK .....some
inexpensive antenna, radio, and computer interface
hardware which A whole spectrum of new user applications and the possibility of a nationwide or even worldwide digital Amateur network are two major areas made possible by faster hardware. Originally published in Ham Radio Magazine December 1989 (A great case study - applicable to current 100Mb and 1Gb DIY link development) http://www.qsl.net/k3pgp/Notebook/Gunnplexers/N6gn/10ghzdata.htm |
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Purdue University Group Project |
Purdue University - 2.45 GHz Yagi
Antenna -
Lafayette Indiana USA Useful project to design a directional disc Yagi of17.5dB gain for point to point WLAN applications..... Has anyone a current link to this excellent project? ed. Purdue University: http://www.purdue.edu/ November 2004 |
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Wireless Internet
Access in Latvia
Guntis Barzdins
Rainis
blvd.29, Riga LV1459, LATVIA |
WIRELESS INTERNET ACCESS IN LATVIA
The Latvian
Research Network LATNET was established in Guntis Barzdins |
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WinProp
Prediction of wave
propagation in indoor, urban and terrain scenarios. |
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WLAN Slotted Waveguide Antennas Unlike wideband antennas like the BiQuad, slotted waveguides are resonant
antennas, Author: Trevor Marshall http://www.trevormarshall.com/waveguides.htm see above: Bi Quad Feed for Primestar Satellite Dish by the same author |
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Downpipe Antenna Slotted Waveguide type for 11 -14dBi horizontal polarisation... The downpipe antenna was born after seeing the
success of the However, 95 x 45 x 0.4 mm ZincAlum downpipe is
readily available Rob Clark http://www.erlang-software.com/FreeNet http://members.iinet.net.au/~clark/FreeNet/Waveguide/#Downpipe May 2003 |
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Horizontal Polarized - Wide-sector
directional antenna. A typical amateur constructed high
performance wide sector directional |
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USB adaptors & DIY antennae "Poor Man's WiFi" ? |
USB
adaptors & DIY antennae "Poor Man's WiFi" ?
Harbour
10Km Link Oct 2005 |
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What is Wi-Spy™?Wi-Spy™
is the world's smallest 2.4 GHz spectrum analyzer*.
Wi-Spy is
Wi-Spy is a
fraction of the cost of traditional spectrum analyzers! |
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Click
on the headings below ANTENNAS AMPLIFIERS PROPAGATION Topics |
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AMPLIFIERS: | |||
500mW Booster |
Pen WLAN Booster WLAN & Wi-Fi 802.11 b/g Booster( Indoor/Outdoor) 500mW PEN BOOSTER 2.4G + Panel 12dBi Pro Base 3M 500mW Indoor PENBOOSTER with RPTNC to RPSMA adapter +
2.4G http://uk.wifi-link.com/product.php?class1_id=13&class2_id=392&class3_id=587 Dec 2010 |
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