Frequency scanning probe for microwave imaging

Microwave imaging techniques have attracted considerable attention as a result of their multiple potential applications in different fields, such as industrial nondestructive testing, detection of buried or concealed objects, noninvasive medical diagnostics, etc. Different theoretical methods and measurement setups have been proposed, based on illuminating the object under investigation with single frequency [1], multi-frequency [1, 2, 3] or Ultra Wide Band (UWB) signals [4]. The scattered radiation is usually measured in different spatial directions (angular diversity), in order to increase the image resolution.