  Contact force is a natural way for humans to interact with the physical world
around us. However, most of our interactions with the digital world are largely
based on a simple binary sense of touch (contact or no contact). Similarly,
when interacting with robots to perform complex tasks, such as surgery, we need
to acquire the rich force information and contact location, to aid in the task.
To address these issues, we present the design and fabrication of Wi-Chlorian,
which is a 'wireless' sensors that can be attached to an object or robot, like
a sticker. Wi-Chlorian's sensor transduces force magnitude and location into
phase changes of an incident RF signal, which is reflected back to enable
measurement of force and contact location. Wi-Chlorian's sensor is designed to
support wide-band frequencies all the way up to 3GHz.We evaluate the force
sensing wirelessly in different environments, including in-body like, and
achieve force ac-curacy of 0.3N and contact location accuracy of 0.6mm.
