TechWeb - Apple's latest patent filing for a handheld computing device reveals that wireless communications will play a part either in an upcoming revision of the iPod or in Apple's long-rumored mobile phone. The patent application, filed in August and published today, summarizes the invention thus: "The portable computing device includes an enclosure that surrounds and protects the internal operational components of the portable computing device. The enclosure includes a structural wall formed from a ceramic material that permits wireless communications therethrough. The wireless communications may for example correspond to RF communications, and further the ceramic material may be radio-transparent thereby allowing RF communications therethrough." With the introduction of Microsoft's wireless-capable Zune media player, analysts have anticipated Apple would add similar capabilities to its iPod. At the very least, this filing demonstrates that Apple's engineers are working on it.