In this LC circuit, the part of the circuit enclosed by a dashed rectangular box represents the resonator on the top side of the substrate and the elements along route 2 denote the source-load coupling structure.
Once the LC circuit model is created, the circuit can be thoroughly investigated by using a circuit-level simulator.
The equivalent even- and odd-mode one-port half-circuits, shown in Figures 4(a) and 4(b), respectively, can be obtained by opening and grounding the complete LC circuit at its plane of symmetry.
Upon a further survey of the equivalent LC circuit model of BPF A in Figure 2, we can regard the original coupling route that provides coupling between the feedline and the overlapped resonator via [C.
With the elements of the LC circuit optimized to be [L.
However, the attenuation pole location, which corresponds to the resonance frequency of the parallel LC circuit, also shifts toward lower frequency range because of the fact that as the series inductance increases, the resonance frequency of the equivalent parallel LC circuit decreases.
In the previous section, it is shown that the parallel LC circuit represents the equivalent circuit of the proposed DGS section.