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Short Backfire Antenna on 5,6 GHz

 I was looking for a design that promised reasonable gain without excessive size. The short backfire antenna is not a common antenna, promised 20dBi and looked easy to build. Several designs were found and analysed which did reveal a few discrepancies which seem now that been resolved. 

A quick look at the finished antenna shows a 'cake tin' style base fed with a elliptical patch as vibrator and a waveguide as sub-reflector.
 

 

anigif.gif

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Nice alternative for a DIY parabolic reflector! Could you provide a cross-section view? Or some ratios for distances?

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,,,thanks buddy,
but it must to know that the antenna is big enough and can not adapt to a parabolic reflector,,,!!!

It has a diameter of about 258mm

screenshot_4509.jpg

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как насчет графика VSWR? этот дизайн мне тоже нравится.

What about the VSWR schedule? I also like this design.

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On 27.08.2017 at 10:05 PM, Admin said:

,,,thanks buddy,
but it must to know that the antenna is big enough and can not adapt to a parabolic reflector,,,!!!

It has a diameter of about 258mm

screenshot_4509.jpg

Hello !

Do you have a dimensional drawing for this type of antenna?

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,,,hy dude..!!!

 I do not know, simulation is long  time ago ...!!!

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,,,Yes, but this small antenna (116mm diameter) can be used in the focus of a parabolic offset...

backfire 5.5ghz romb_01.jpg

backfire 5.5ghz romb_02.jpg

backfire 5.5ghz romb_03.jpg

backfire 5.5ghz romb_04.jpg

backfire 5.5ghz romb_05.jpg

backfire 5.5ghz romb_06.jpg

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Good, these are the dimensions on the SBF antenna above,,,

41.jpg

,,,and the simulations...

SBF 5,5_01.jpg

SBF 5,5_02.jpg

SBF 5,5_03.jpg

SBF 5,5_04.jpg

SBF 5,5_05.jpg

SBF 5,5_06.jpg

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Loops can be very efficient, but small loops sold by most antenna companies are just too short. Best for 20/30/40m would be a 19ft perimeter loop.

Gil.

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,,,what it"s "20/30/40m would be a 19ft perimeter loop."....???
 

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