Tamas Priskin netted the only goal of the match with a neat finish in the 78th minute to put one foot into the final of the competition but the Gunners boss is targeting a much better showing when his side hosts the Championship outfit in a fortnight.
"We didn't create many chances," said Wenger. "Ipswich defended very well and we were caught out.
"We had no spark, Ipswich were sharper than us and we made a defensive mistake which they took advantage of.
"But we're at home in the second leg and that could make all the difference."