The emerging technologies of wireless communication system, on chip and low power sensor nodes give importance to Wireless Body Area Networks (WBAN). WBAN consists of small sensors. It includes many applications such as healthcare, entertainment, gaming, and military applications. It provides instant monitoring anywhere they move that is Ubiquitous healthcare. In this paper we provide a survey on different architectures of Wireless Body Area Networks, which is used for Ubiquitous healthcare monitoring. Different standards and devices used in paper are also discussed. Path loss is very big problem in this Wireless Body Area Networks. It shows great impact on communication. This can be solved by different In-Body communication and different factors.