Microwave Sensors Based on Symmetry Properties of Resonator-Loaded Transmission Lines

Figure 4

Resonator-loaded transmission lines useful for the implementation of microwave sensors based on symmetry disruption. (a) Folded SIR-loaded CPW [26]; (b) SIR-loaded microstrip line [29]; (c) CSRR-loaded differential microstrip line. In all the cases, the symmetric configuration that prevents from resonance is shown. In (b), three metal layers are required (the ground plane is not depicted).

(a)

(b)

(c)