Question : Using wireless LAN and network card LAN together to double bandwidth

I own a laptop, and I have a wireless LAN card as well as the built-in network LAN card.
The area where I work at has wireless LAN coverage as well as cable network connections. I think the network here works by allocating a certain amount of bandwidth to each connection, so that everyone could share the bandwidth.

Could anyone tell me whether it is possible to use both the wireless LAN and the network LAN card together so that I could achieve double the bandwidth? And how?

I've seen some dialup technology which doubles bandwidth by having two modems on two dialup lines. This shouldn't be any different.

Answer : Using wireless LAN and network card LAN together to double bandwidth

Let's start by analysing your opening statement:

"I think the network here works by allocating a certain amount of bandwidth to each connection, so that everyone could share the bandwidth."

Now, I'm going to assume that you are at either a company or a school/dorm or similar so that a bunch of people share the same internet connection.  The way almost any setup behaves will be that for however many computers are trying to get internet info at the same time, the main connection is equally shared.  Other schemes are possible in theory but would be a pointless administrative headache.  So, if 50 people want downloads at the same time, you get 1/50th.  If you double your speed with a second network card, that becomes 2/50th.  Your best bet is really to convince everyone else to go out to lunch together while you stay in the office because these tiny fractions aren't worth the headache.

To address your main question directly, certain network cards can be ganged.  This requires special drivers and usually level 3 switches.  If you control both ends of the connection, it becomes much easier and a matter of only special drivers.  As Irmoore points out, wireless has lousy bandwith compared to your internal 100Mbit and so isn't worth trying to team.  BTW, I think the DLink 650 is 802.11A and therefore 65Mbits at theoretical max, not 11.  in any case, it's still a shared frequency.

Note that your idea is technically feasable.  There are just a couple of pratical obsticles.  Please write back when you have administrative control over the server or router as well as access to the raw source code for both network adapters' drivers.  Oh, and be sure to install level 3 managed switches because that will help a lot.