Hello ND
i have spent a little bit of time looking for an answer to your question.sidelobelesser than 30dB=~ no sidelobe level
equation for directivity for a binomial array D=1.77*sqrt(N)=1.77*sqrt(10)=7.48dB
sidelobe's will be seen between a spacing of lambda/2 and 3 quarter of lambda.when the spacing increases beyond 3quarters of awavelength,sidelobe levels are actually higher than the desired lobe.
Regards
Chachito.
---------- Post added at 15:17 ---------- Previous post was at 15:00 ----------
i have a matlab file,where you could actually look up the sidelobelevels for various interelement spacing? would you be interested?
Regards
Chachito.