Many doubles players will ask me, "Why do we always get lobbed over when we go to the net?"
First, you might be approaching the net too fast or getting too close to the net. This will force your opponent to lob. If you like to move backwards and you like to hit overheads while moving backwards, then this could be your strategy.
Second, you might be hitting your approach shots too hard and deep. This might force your opponent to stay deep and defend with a lob. Try mixing in a short, soft defensive chip shot off your approach shot or on your return of a second serve. Hit short cross-court, and follow it in to the net. This will force your opponent to come forward, minimizing the chance that they can hit a successful lob.
Third, when you see your opponents in the typical "up" and "back" position on the court, picture the opponent nearest the net wearing a T-shirt that reads "Non-Lobber." The sooner you can attack the "Non-Lobber" in a point, the less you will be lobbed. Remember, when both of your opponents are at the net, both will be wearing the "Non-Lobber" T-shirts. This is a good time to lob then off the net.
Good luck on the court!