Microwave sensor for measuring the moisture of masonry surfaces comprising a microstrip resonator coupled with an open coaxial probe

The measurement device includes a microwave sensor, a microwave analyzer which is essentially composed of a microwave signal generator and a microwave power meter, and a processing unit to which the analyzer is interfaced. The sensor includes a resonator and an open coaxial probe . The resonator is produced by means of a length of microstrip line , terminating with the probe and short-circuited at one end A. The microstrip is produced on a laminate of low-loss dielectric material . The collector plate forming the ground is indicated with . Operating on the microstrip are two weakly coupled ports with coaxial output, indicated with and respectively.