Abstract
The paper presents an improved equivalent circuit parameters extraction method for the dumbbell-shaped defected ground structure (DGS). The new extraction parameters equations are obtained in closed-form expressions, which contain S11 and S21. The DGS unit with center frequency of 5 GHz is designed and fabricated on a TLX substrate with thickness of 1 mm and dielectric constant of 2.55. The circuit simulated results are in good agreement with the measured results. This parameters extraction method can be widely used for the design and analysis of DGS .
Highlights
In the late 1990s, defected ground structure (DGS) was firstly proposed by Korean scholar J
To show the validity of the method, a dumbbell-shaped DGS unit was fabricated on a TLX substrate with 1mm thickness and 2.55 dielectric constant, and the measured results are in good agreement with the simulated results
On the basis of the above principle, steps of the improved LCR equivalent circuit parameters extraction method for DGS are given as follows: 1) The resonant frequency 0, the cut-off frequency c and the terminal impedance Z0 are obtained by frequency response curves; 2) Calculate the equivalent capacitance C and equivalent inductance L by Equations (1) and (2); 3) Calculate R11 and R21 by Equations (5) and (6); 4) The value of parameter R in equivalent circuit is obtained by Equation (7)
Summary
In the late 1990s, defected ground structure (DGS) was firstly proposed by Korean scholar J. DGS is an etched periodic or non-periodic cascaded configuration defect in ground of a planar transmission line [2] (e.g microstrip, coplanar and conductor backed coplanar wave guide), which disturbs the shield current distribution in the ground plane. This disturbance will change characteristics of a transmission line such as the line capacitance and inductance to obtain the slow-wave effect and band-stop property [3,4,5,6]. In this paper, based on the LCR equivalent circuits,an improved parameters extraction method is proposed, which uses the S11 and S21 information and can give better frequency responses of defected ground structure. To show the validity of the method, a dumbbell-shaped DGS unit was fabricated on a TLX substrate with 1mm thickness and 2.55 dielectric constant, and the measured results are in good agreement with the simulated results
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