Posts Tagged ‘wireless’

5 – 6 GHz Helical Antennas

Thursday, September 13th, 2007


Wow ! It’s a surprise for me to see that helical antennas are working so good on 5ghz to 6ghz band. Here is a company that selling them http://www.q-par.com/products/helical-antennas/5-6-ghz-helical-antenna

GAIN ~10 to 11.5 dBic by specification -who knows 🙂

So if You like to try 5ghz wireless links, You may try helical antennas . I’ll be waiting for results if someone try to build and test this.

Here is the picture of one of this – nothing unusual really:

5GHz Helical Antenna5GHz Helical Antenna

DIY Hi-Gain Antenna on Cheap ;)

Friday, August 31st, 2007


Very Cheap Dipole feeders – they are easy to be build and you do not need a lot or expensive materials. Everything here can be made from wire or scrap /I watch too much scarpwars on Discovery channel 🙂 /

I found some very interesting looking feeders for dishes – VERY cheap to make, first is made only from feeder line 🙂 or simple coax.

http://patraswireless.net/antennas.html

dipoledipole

A simple dipole feed. Good solution to illuminate parabolic constructions (solid, grid etc.) Heliax holds the dipole, as well as feeds the N-type female connector to the back. Tests shown 4 dBi (against Lucent 24 dBi parabolic grid). “

Second is Russian of course http://www.hub.ru/forum/index.php?showtopic=16285

Name of the file is interesting too D_Linc3_008.jpg

d_linc3_008.jpg

Interesting materials – onli several pieces of pcb board are used – very good.

From the same forum are these too –

d1.jpg d2.jpgdipole_construction.gif

Last pic is from http://martybugs.net/wireless/conifermods2.cgi

And for the end howto make wire reflector or DIY Parabolic Grid Reflector

diy reflector

Info is from this : http://www.zero13wireless.net/foro/showthread.php?t=248

19dbi gird blueprint :

19dbi gird blueprint

For me is easy to buy small offset dish – 80cm is around 10 to 15 Euros here.

Wlan Antenna Splitters

Wednesday, July 4th, 2007


At last I have collected a lot of pictures of different wlan antenna splitters .

Some blueprints and links too.

Some dimentions ARE NOT for 2.4ghz !!!

spliter-napoly.jpg napoliwireless.net powersplitter

http://www.uksmg.org/split.htm Similar to up picture but using coaxial cable.

Wilkinson power splitters.

splitter

This is just a pics found in the net or cant remember links for them.

hpim0425.JPGpowersplitter.jpgsplitter

splitter http://home.teleport.com/~oldaker/power_dividers.htm

splitter.gif vhfman.freeuk.com

The idea/may be/ and ps file and this pic 800 mhz splitter are from here http://www.wireless-homebrew.com/wireless/appendixF.html#6

If some one explain me this thing here I’ll buy a couple of bees 😉
“It is possible to use old 800 MHz cellular phone power dividers/combiners at 2.4 GHz because of the 3rd harmonic relationship.

Different designs :

powersp.gif2g4splitern.gif2g4spliter2.gif

spliter-n.gif I found this one completed whit some pics – sorry again can’t find link to original file. Send me a link if You know it.

1.gif2.gifsplitter1.gifsplitter2.gifsplitter3.gif

PCB Splitter wlan design from http://df2ck.de/tech/splitter/

pcb splitter pcb splitter

Coaxial line splitter / divider for four dipoles or biquads

http://www.dynaperl.de/wimo/?w=1217

four bicuad coaxial linefour bicuad coaxial linefour bicuad coaxial linefour bicuad coaxial line

http://www.dynaperl.de/wimo/nachbau/?w=1217

4 biquad dipoles connected using coax line4 biquad dipoles connected using coax line4 biquad dipoles connected using coax line

Next there is another 4 way coax splitter :

4 biquad dipoles connected using coax line

You can search for 23cmhybrid.pdf or Hybrid-Double-Quad-Array-D.pdf

http://www.google.bg/search?q=23cmhybrid.pdf&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

http://www.google.bg/search?q=Hybrid-Double-Quad-Array-D.pdf&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Last this one is without coax :

http://www.frars.org.uk/cgi-bin/render.pl?action=link&url=1162

1162.jpg 1183551009-1162-image-4double_quad_back.jpg

And finally some links :

http://home.iae.nl/users/pe1ogf/power.htm

http://www.hdtvprimer.com/ANTENNAS/merging.html

http://www.ee.bilkent.edu.tr/~microwave/programs/magnetic/mwpower/wilk1.htm

http://rfdesign.com/mag/radio_designing_lc_wilkinson/

http://www.microwaves101.com/encyclopedia/couplers.cfm

http://www.pa3csg.hoeplakee.nl/hybrid/hybrid.html