devton

the main problems with 60ghz is you can not use usual connectors... i would use something like tiny cantenna as feed for dish

you will never know until build one

there is no dielectric in this backfire antenna only radome and about 16-17dbi for such compact antenna...i am not sure and that is why i asked someone with SWR-meter build it and compare with reference 17dbi yagi or panel this double dipole with single feed is PERFECT exactly for Backfire antennas...there is chance that this antenna in real life may perfome even better than _some_ simulators show. but yes,16-17dbi is DEFFINATLY upper limit for this sizes

well, looks at the picture in first post. 17DBI - twice better that is why i so surprised that no one still constructed it

p.s. it looks +2db even if compare with commercially available 2.4 GHz backfire antenna same sizes SO if you got SWR-meter and lot of free time - try to construct it because this 2dipoles feed system is perfect for backfire antennas

which kind of connection for this dipoles? there are options:

when i thinked about this antenna, it was single feed point in my imagination )) so when 2 dipoles connected to 1 feed point it is gonna work like primitive array

Second helix not connected to reflector and may work just as passive reflector! It may be not seen on picture, but it should be behind main helix (between main helix and reflector) in 0.25 wavelength from main helix. Main thing here - just same helixes AND round wire in helix (not stripe). Maybe you can simulate it with small amount of helix turn (3-4-5) ?

single 5 turn helix should be 10 dbi too 0_o?

single 5 turn helix should be 10 dbi too 0_o?

yes it is maybe it took few tryes by moving it on X axis before it work well...

show from different angle looks like IT but i can not understand how it looks in 3d

yes in air i think....if connect second helix to reflector near place where first connected, it wiill be odd omnidirestional antenna with a lot of OHMs and asymmetrical diagram

let say so: on short helix antenna it's better be same round wire for reflector-helix on long helix it may be stripe

i think from same round wire as main to let traditional big reflector work as it should it will work as in yagi antennas where reflector it is just same wire

from head

thanks 0_o not all ideas good, i see...not always bigger is better )) i am talking about amonut of yagis and impedance