Hi Hyunwoo,
I'm developing an UWB shield for Arduino with two friends. It's called Pozyx and it will be available May 2015 on kickstarter. It's primarily used for indoor positioning with centimeter precision. But it can also be used for UWB communications. It's also possible to reprogram the shield if you really want to do some custom UWB things.
If you're interested you should check it out or support pozyx on kickstarter!
Cheers,
Samuel