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Admin

Biquad Antenna

175 posts in this topic

hi admin, this is my first posting on your fine forum.

Could the sma connector be soldered into the tube and fed with rg402 semi rigid coax ,instead of crimping and the 1.8 cu wire.

cheers.

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,,,hi buddy,

I do not think it would be a good solution," to think about it...!!!

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many thanks for the quick reply.

I guess its also unwise to use brass instead of copper ?

cheers.

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Thank you.

I've built this one in the past (Marty Bugs) website I believe. 

The only thing I don't like about this design is the heavy LMR400 coax feed.

I prefer to use rg402 type coax.

I have my biquad antennas mounted on a mast outdoors - I soldered a 100mm length of 15mm Di, cu tube to the rear of the reflector, as a mounting point to a mast, will this approach upset the antenna gain?

Cheers. 

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Ok, it does not matter the type of coaxial cable, but the inside diameter of the pipe must can be pressed on the coaxial cable

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Thanks,  I've built hf and vhf antennas but im finding ghz frequencies a whole new ball game and a steeper learning curve. 

Cheers. 

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With this biquad form, you can get a bandwidth increase...

Dimensions are given on the axis of symmetry of the Cu Wire

4c.jpg

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hello.. 

i've built omnidirectional quad antenna in cst. according from a journal, if we add a reflector about 1/4 Lamda from the center of the structure we got higher gain..

but in my simulation, i got smaller gain. i dont understand, i think i wrong on coaxial probe. please help me hehehe.. thank you very much

 

journal 2.PNG

journal.PNG

port.PNG

quad.PNG

with reflector.PNG

 

farfield without reflector.PNG

farfield with reflector.PNG

Edited by Luthfi Gibrani
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Hi buddy,

I like your achievement, but you must to know that the gain of a cp cross biquad is negative, that is it is less than a single dipole because of the power split to feed two antenna elements from the same source,by cross-polarization, you lose about 6 dBi.

Okay , I tried this solution without the results being spoken on the internet

,,,try this option too...

BiQuad-Top-view-actual-size.png

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On 1/16/2017 at 10:36 PM, Admin said:

,,,a biquad antenna on PCB(10,5dBi) and panel antenna with 4biquad(16.5dBi)...

 

55.jpg

50.jpg

 

The Best ....!!!

 

 

screenshot_3395.jpg

92.JPG

Hi admin,can i use this on 5200 Mhz frakens?

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Buddy, these antenna parameters are calculated for 2442 MHz frequency, for 5200 MHz they do not fit.

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On 4/18/2018 at 9:06 PM, TomCat said:

Hi admin,can i use this on 5200 Mhz frakens?

,,,no,

if you want for the 5.2 GHz frequency ,tell me...?!

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3 hours ago, Admin said:

,,,no,

if you want for the 5.2 GHz frequency ,tell me...?!

Hi admin,i resize the dimension and got vswr 1.003 on 5.2Ghz in CST.i like this biquad design so much. thanks.

test52.cst

Edited by TomCat
Missing Attachment
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okay buddy, I'm glad that you work with the CST...!!!

Please, post your results, here in the forum...!!!

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Hi, is this model available, but with a double bi quad element? I would really appreciate a .cst file!

 u.jpg

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 ,,,coto, if you know cst, why do not you try this option...!!?? 

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17 hours ago, Admin said:

 ,,,coto, if you know cst, why do not you try this option...!!?? 

I know a bit of CST but I'm not experienced enough to create this model unfortunately... :( 

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,,,okay,I will try to do a cst modeling for you...!!!

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I would err on the side of caution, measure from the bottom most part of the upper antenna to the upper most part of the lower antenna.

The reflector and metallic structure of one antenna can have a detuning effect on not only the active elements but the tuned reflector and director elements of the neighboring antenna.

 

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On 8/11/2019 at 0:25 PM, Admin said:

 ,,,coto, if you know cst, why do not you try this option...!!?? 

Hi 

can you please share model coto detail

and do you have this model ?

 

 

14564008.jpg.a9cdc8d532e9bb0a4e7fc1b759aad569.jpg

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