Abstract
In this paper, an equivalent circuit model (ECM) for a defected ground structure (DGS) pattern is proposed and evaluated for designing a compact low-pass filter (LPF). The proposed ECM is based on microstrip lines and microstrip-slotline transitions. Every slotlines of the DGS unit are modeled by ideals transmission lines of characteristic impedance and electrical length. Comparison between full-wave EM and circuit simulations illustrates the validity of the proposed ECM.
Highlights
Various etched defects on metallic ground plane, namely, defected ground structure (DGS) have been focused by many researchers
A DGS unit in either microstrip or coplanar waveguide is modeled by lumped elements (LE), i.e, a parallel LC resonant circuit, known as conventional equivalent circuit model (CECM) connected to transmission lines at both sides [1]
It is necessary to establish an accurate technique by developing another equivalent circuit model (ECM), which is derived from DGS physical dimensions and do not need to use EM simulation to achieve it parameters
Summary
Various etched defects on metallic ground plane, namely, defected ground structure (DGS) have been focused by many researchers. Some circuit models based on an inductor and a shorted stub for a spiral DGS and a short stub, additional series transmission lines and a resistor for a dumbbell DGS have been presented in literature [5], [6]. Even though this type of circuit models can present a periodic frequency response, they require a full-wave electromagnetic (EM) simulation in order to determine the values of their elements. The availability of substrate material, which is used in this work, is based on RO4350B Rogers material with a thickness of 0.25 mm, conductor layers of 35 μm and a relative permittivity of 3.63
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