A larger-sized Kindle Fire may have just passed muster at the FCC, according to documents found by The Digital Reader. While the files have little detail, they do indicate that Amazon intends to release a 4:3 aspect ratio device, which is likely to be a 9.7- or 10-inch version of the Kindle Fire.

Rumors surfaced in July that Amazon would introduce a 10-inch model of the Kindle Fire alongside a refreshed version of the original. The first Kindle Fire has been available for only nine months, but its moderate success has been threatened by the release of Google's Nexus 7 in July.

The relevant document in the FCC filing shows only what appears to be the back of the device, and where the filing company intends to place the FCC certification icon. The Digital Reader also points out that, per Amazon's usual MO, the filing company is an empty front named Harpers LLC.

It's not impossible that Amazon is simply changing the aspect ratio of the 7-inch Kindle Fire in its refreshed version, but it's highly unlikely. The FCC documents are set to be released in full in December, meaning the device will launch some time this fall.