DW1000 Radio IC

My name is Yuki Maeda and I am writing you from Japan.
I have a question regarding item DW1000 Radio IC that I found on your webpage.
Can we use this product in Japan?

I look forward to hearing from you soon.
Yours sincerely,

DW1000 Radio IC can be used in Japan for R&D only as UWB product with DW1000 can not be certified for Japan standard.
We are however working on a new transceiver which will support a higher channel frequency to address Japan.
So it is possible to research and evaluate the technology in the Lab.

Sir, can you tell me how to calculate range (link budget) to find out -5dB gain antenna is okey for 50 Meter communication on band 5??? please reply urgently…