Abstract: A passive wireless sensor is disclosed. The sensor has at least a measurand sensitive member and an electromagnetically resonant member positioned proximate to each other. The resonant member comprises a preselected resonance frequency, such that it scatters at least a portion of an interrogating signal as a scattered signal proximate to its resonance frequency, and the measurand sensitive member alters the scattered signal as a function of the measurand to change the shape of the scattered signal. The reactive field of the sensor is kept within the sensor to minimize environment interference and to maximize its signal strength. Almost bond-free packaging mitigates problems with delamination or internal stresses due to differing coefficients of thermal expansion.

Abstract: A circuit for processing radio frequency signals. The circuit can include a substrate board that has at least one dielectric layer (100) having a first set of substrate properties over a first region (102). The first set of substrate properties can include a first permittivity and a first permeability. A second region (140) can be provided with a set of second substrate properties. The second region can have a second set of substrate properties including a second permittivity and a second permeability. The second permittivity can be different than the first permittivity and/or the second permeability can be different than the first permeability. A first transmission line (102) having at least one discontinuity can be coupled to the second region (108). The discontinuity can include a bend, corner, non-uniformity, break in the transmission line, or a junction between the first transmission line and a second transmission line.