In joining the group, Microsoft hinted that support for the group's proposal would supported by future versions of Windows.
"With WiMedia Alliance, we are demonstrating our commitment to help the industry develop specification and interoperability programs that ensure best-of-breed wireless experiences with Windows-based PCs," Kosar Jaff, product unit manager in Microsoft's Windows Division, said in a statement.
The group, which recently combined with the MultiBand OFDM Alliance Special Interest Group, has said it will release the first version of its physical layer specification for UWB by the end of June. Other members of the group include Hewlett-Packard, Intel, Nokia, Samsung, Sony and Texas Instruments.
By contrast, another UWB proposal has been championed by Motorola and Freescale Semiconductor is further along in the development process but has far less industry support.