Wednesday, June 25, 2008

HLSSA software for design slotted waveguides

HLSSA software for design slotted waveguides site is down.
I mention this software many times, but it seems that site from which I downloaded it is down, so I’ll put back online. IF anyone is unhappy whit this - contact me and I’ll stop spreading it!
HLSSA software for design slotted waveguides is here :
This is english version and last according to version that I can find- ver6.1
Here You can find German ver 5.4
Authors are DK3BA and DH6SBN.

Tuesday, June 24, 2008

NL PowerSplitter for wifi applications

I can’t remember direct link to site from where I found this pictures but on them is writhed on them :

Sector Antenna GRAD2487

From this site I can find that the price of this is nearly 200 euros or 260$ !!!
Quick specifications :
Frequency band

2400-2483 MHz

13 dBi
Maximum input power

100 W
Power distribution diagram

Horizontal: 90°;
Vertical: 18°;

50 Ohm
Standing wave coefficient

Mast mount diameter

35-60 mm

1.8 kg
Size, L x W x H

250×160x360 mm
Maximum wind speed

160 km/h

Operating temperatures

-40° … +50° C

N-Type female
Additional information

Input is DC-circuited
In the russian forums for a lot of antennas this last “Input is DC-circuited” is very critical ! There is some sort of fanaticism about this may be the weather there, I’m not sure why.
Here is link to some pictures of the interior from here :

Stacking 4 ATMOS Antennas

Interesting post in zero wireless forum about stacking four atmos antennas.
The result looks very bizarre really :
here is the link :

Cardboard Slotted Waveguide

On You can find interesting antenna projct cardboard slotted waveguide.
Aluminium foil and cardboard is used to build slotted waveguide wifi antenna.
Here some pictures

Last picture is 11Ghz and 2.4Ghz versions compared.
Waveguide is tested and the resuts are very good - more than 14dbi are reached!
This is a good way to fast build and test antennas, also quick modifications are possable.
The bad thing is that You can not solder aluminium - which for this antenna is not a problem.
The author of this post call this “40cents antenna” and he has several different types of antennas builded and tested.
You can find the links on the forums.

12Dbi 180degree Sector WiFi Antenna

Interesting design as You can see.
There are four stacked biquads or bicircles over a corner reflector.
Here is a PDF file whit a dimensions of this wifi antenna : 12dB_sektor_antena.pdf
Interesting moments are grounding and feeding of the circle elements - you can see this here :

Thursday, June 19, 2008

D-Link ANT24-1800 Again …

Thanks to KATTS at we finally have all dimensions of D-Link ANT24-1800 antenna!
In first post I have some mistakes in info about this one in my previous post here.
More info here :

FA20 EM Simulations

On forum I found very interesting article - there are some em simulations of this famous russian antenna. Interesting is that the auhtor made several test with different number of radiating elements.
This is FA20 original design : Next is with 12 patches :
And finally 16 elements :
Here are results for swr in different simulations :
VSWR 8 Dipoles –> minimum at 2.44ghz 1.46; from 2.4 to 2.5ghz <2.5vswr> minimum at 2.45ghz 1.89; from 2.4 to 2.5ghz <2.8vswr> minimum at 2.44ghz 1.96; from 2.4 to 2.5ghz <3.4
SWR results are not very good
This may be due to a different dimensions used by fable to test this design.
He also used very interesting metod to build and test this design. He used aluminium foil and cardboard.

SWR tests of wifi panel antennas

Tere are some interesting result of testing panel antenna for wifi band on Russian site :
Antenna is tested when the pcb print is looking toward to a reflector and back.
You get lower SWR when the pint is looking to a reflector - pictures shows all :

5Ghz Slotted Waveguide

Some photos of my 5ghz slotted waveguide antenna project - never finished and tested due lack of proper hardware to test.
Made from aluminum tube and calculated whit hlssa program.
This is ten slots dual side design.

12Dbi 180degree Sector WiFi Antenna

Interesting design as You can see.
There are four stacked biquads or bicircles over a corner reflector.
Here is a PDF file whit a dimensions of this wifi antenna : 12dB_sektor_antena.pdf
Interesting moments are grounding and feeding of the circle elements - you can see this here :

I never sow biquads to be grounded or feeded like this

Wednesday, June 18, 2008

Small Coax Omni Antenna for WIFI

Found on
I cant find original site of this antenna there is links on Zero13wireless forum.
I cut a lot of coax without any success before time in attempt to make a coax omni antenna.
This thing here is looking different. But maybe will work.

This is the idea :
30mm in the beginig 1/4 wave - may be patching section.
40 mm of outer of coax is used to dephaseing sections.
60 mm sections as 1/2 wave radiators.
And that is.

Cisco 2.2dbi PCB OMNI Antenna

Saved long long ago from an old Russian forum:
The site is running now again, but without a forum, and no new info is available.

DWL2100 or AR2313 AP schematic

Intel internal WiMAX / WiFi card pops up in FCC database

Intel internal WiMAX / WiFi card pops up in FCC database
Some specs and more pictures without white labels

11dbi SMC Panel

First I wish to say that I build and tested this antenna, and I was SURPRISED - how this small device is able to work so good! This small antenna outperform my other two homebuilt 14dbi wifi panels.
I used two one sided pcb to create this, but on the zero forum there are pictures where only thin metal sheets are used, and it works again.
The diameter of the circle is equal to the half wave light of the 2.4ghz wifi band or 62mm , so this antenna may be recalculated for other /5ghz/ frequencies.
Now antenna INFO :
Name of Antenna, model : SMCANT-DIFP11
Data sheet can be found on this link :
Frequency : 2.400 - 2.500 GHzGain : 11 dBiVSWR : < 1.22POLARIZATION : CircularBEAM WIDTH • Horizontal: 70° • Vertical: 70°IMPEDANCE • 50 OhmsDIMENSIONS • 25 x 102 x 102 mm

So here is the interesting part - this one is found disassembled on

Link to the forum

Very small! Great results!
Dimensions of the reflector are 105×105 mm
8 mm gap between two metal plates of the “circle” and the reflector.
Here are my test whit this antenna - the original test was for other but I need something to compare :
Here is the way to stack two of these homebuilt antennas together :

5 - 6 GHz Helical Antennas

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
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:

Backfire Helix Feed

First - I never made any helix antennas, nor spirals or anything similar. Consider this as warning BUT in the HAM world spiral feeders used in dishes is something very often used.

Very simple - small spiral and reflector in front of the dish.
It looks like that in the spirals there are several modes endfire and the normal-mode. This modes are explained on the side, but more reading is needed. Also there is right and left hand rule in these antennas.
On the page is a NEC code witch may be useful to simulate this antenna.
Dimensions on the pictures are given for 2401MHz but the peak for this is around 2.3ghz so for tests whit wifi we must change dimensions a little.
If anyone have the references as PDF - do not bother to send them to me
more pics :

Pac Wireless Feeder 5Ghz

Here is my collection of pictures of PAC Wireless 5ghz feeder.
Please If Anyone have idea what design is used inside and have any pictures - send me a mail or post a comment or contact me.

Horn And Waveguide Feeder for 2.4Ghz

I always wonder haw to feed waveguide or horn from the back - all the designs are feeded from side as usual Cantennas.
Now I have picture - file is pretty old but interesting.

I cannot remember from where I take the PDF file to write a link. Here it is 8602-4.pdf ,I didn’t change the name of the file.
Most interesting is that the connector is on the back - also wide band feeder is used and antenna is DC grounded - which differ from original cantenna design.
I used a lot of cantenas and this will be tested at first possible moment.
Also may be used in slotted waveguides.

2.4Ghz Yagi Antenna for WIFI - using single sided PCB board

don’t like Yagi antennas /sorry/, and I never try to make one , but this look interesting - it is only one side pcb design that differ from the most dual sided similar.
On the side is said that this antenna is a clone to a commercial one, but not a name or model is mentioned.
The dual sided board is needed to make the feeding point of the yagi antenna - here we have something very interesting and different to be able to make all needed parts on one sided PCB board. In fact this is dipole.
Link to the page :
Here is schematic :

On the second picture You can see haw to assemble the dipole - this is the interesting part. This antenna is feeded by dipole not whit loop like most Yagi antennas. Here they make a balun whit the stripped coax and the pcb board.
There is also one aluminum disk used to hold the board that is used as reflector :
On the site is said that this antenna have 11.5dB gain. And for last there is a SWR test for this antenna pretty good results I thing :

The peek is little out of wifi band but we still may get very good results for wlan applications