Circuit Model Analysis for Traces that Cross a DGS

Jung, Kibum; Lee, Jong-Kyung; Chung, Yunchul; Choi, Jaehoon

doi:10.5515/jkiees.2012.12.4.240

Cited by 8 publications

(3 citation statements)

References 6 publications

(4 reference statements)

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“…In the design of modified U‐shaped DGSs, the most important property is the resonance frequency. In terms of modeling for simple slot‐shaped DGSs, geometrical models based on the planar transmission line were proposed to give an improved physical insight of the operation principle .…”

Section: Introductionmentioning

confidence: 99%

Modeling stepped U‐slot DGS microstrip line

Woo

Lee

Nam

2016

Micro & Optical Tech Letters

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control voltage V t_l is tuned from 1.2 V to 2 V. At V t_l 5 2V, the TB oscillator operates between 8.44 and 8.71 GHz at high band as the control voltage V t_r is tuned from 0 V to 1.0 V; the TB oscillator operates between 6.74 and 6.86 GHz at middle band, as the control voltage V t_r is tuned from 1.1 V to 2 V. The figure of merit (FOM) is calculated using the following equationwhere L{Dx} is the SSB phase noise measured at Dx offset from x o carrier frequency and P DC is DC power consumption in mW. Table 1 is the performance comparison of VCOs. The phase noises in [10,15], [this] in Table 1 were measured using the same set-up. The phase noise performance of this VCO is better than that of TBVCO in Ref. 10. CONCLUSIONThis letter proposes a TB oscillator using the composite of a lefthanded resonator and a RH resonator. Two pairs of varactors are used to tune and switch the frequency band. In the oscillator, the left-handed and the RH oscillator shares the same fundamental mode at the middle-band, while the low-frequency band uses the left-handed resonator in higher-order odd-mode and the highfrequency band uses the RH resonator in higher-order odd-mode. The frequency gaps between two bands are large for wide-band signal source application. The high band frequency is at 8.5 GHz, the middle-band frequency is at 6.8 GHz, and the low-band frequency is at 4.3 GHz. The high (middle, low)-band FOM is 2184.21(2185.13, 2188.29) dBc/Hz.ABSTRACT: This paper presents an equivalent circuit model for a stepped U-slot defected ground structure (DGS). For a stepped U-slot DGS, the defected structure is simply modeled using a short-circuited stepped impedance coplanar waveguide (CPW) combined with a gap capacitor. The proposed circuit model is advantageous in its ability to accurately control the ratio (g 5 f s1 /f r ) of the fundamental resonance frequency (f r ) to first spurious resonance frequency (f s1 ) by changing the impedance and the electrical length of the CPW in each step. By using this property, two types of resonators with normalized first spurious resonance frequencies (g 5 f s1 /f r ) of 4 and 2 were designed and fabricated. Good agreement between the EM simulations and the experimental results were achieved. V C 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:583-587, 2016; View this article online at wileyonlinelibrary.com.ABSTRACT: In this article, a linearly polarized 2 3 2 patch array uniformly fed by a corporate substrate integrated waveguide network for Ku band is presented. Undesired main beam steering is avoided by means of a fully corporate feeding network, although grating lobes may appear due to greater separation between radiating elements. Moreover, a reduced patch separation to avoid grating lobe appearance leads to an antenna matching coefficient degradation due to the proximity of antenna discontinuities. In consequence, a tradeoff approach has been developed, achieving a measured 4.1% matching bandwidth and a measured gain of 13.27 dBi, which corresponds to an 86% radiation efficiency....

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Section: Introductionmentioning

confidence: 99%

Modeling stepped U‐slot DGS microstrip line

Woo

Lee

Nam

2016

Micro & Optical Tech Letters

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“…In those applications, the key issue is to obtain a simple and accurate circuit model to attain optimized design with an aimed performance. Some equivalent circuit models have been presented and these efforts have provided improved design methods and physical insight into the operation principle of the DGSs .…”

Section: Introductionmentioning

confidence: 99%

A modeling method for dumbbell‐shaped DGS and its parameter extraction

Woo

Lee

Nam

2014

Micro & Optical Tech Letters

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This article presents an equivalent circuit model for a dumbbell‐shaped defected ground structure (DGS) in a microstrip line. The effects of equivalent circuit elements of a dumbbell‐shaped DGS and their magnetic coupling to the host transmission line are modeled as a simple lumped‐element circuit. By adding a virtual capacitor on the narrow etched gap, the values of inductance and capacitance of the dumbbell‐shaped DGS in the ground plane were extracted. Also, other main circuit parameters of the proposed circuit model were extracted using EM simulation result. This article provides one approach for understanding the operating principle of the DGS structures. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2910–2913, 2014

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“…In terms of circuit modeling, many other researchers have presented equivalent circuits for various slot-shaped DGSs. Simple lumped elements circuit models [8,9] and geometric models based on transmission lines were proposed in [10][11][12][13]. These efforts have provided improved physical insight into the operation principle of the DGS.…”

Section: Introductionmentioning

confidence: 99%

A Simple Model for a DGS Microstrip Line with Stepped Impedance Slot-Lines

Woo¹,

Lee²,

Nam³

2015

Journal of electromagnetic engineering and science

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In this paper, a simple equivalent circuit model for a defected ground structure (DGS) microstrip line with stepped impedance slot-lines in the ground plane is presented. In addition, an analytic expression for the resonance frequency of the proposed structure is derived. In equivalent circuit modeling, the capacitance and the inductance of the resonance circuit are evaluated from the dimensions of the etched pattern in the ground plane. The resonance frequencies calculated from the proposed method are compared with those obtained with an electromagnetic (EM) simulation.Key Words: DGS, Equivalent Circuit Model, Stepped Impedance Slot-Line. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

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Circuit Model Analysis for Traces that Cross a DGS

Cited by 8 publications

References 6 publications

Modeling stepped U‐slot DGS microstrip line

Modeling stepped U‐slot DGS microstrip line

A modeling method for dumbbell‐shaped DGS and its parameter extraction

A Simple Model for a DGS Microstrip Line with Stepped Impedance Slot-Lines

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