Equivalent Circuit Model for a Simple Slot-Shaped DGS Microstrip Line

Woo, Duk-Jae; Lee, Taek-Kyung; Lee, Jae Woo

doi:10.1109/lmwc.2013.2274037

Cited by 21 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equivalent circuit is modeled in Figure B. Whereas the parallel RLC resonator comprises a conventional single‐layered DGS model ( L s , C s , R s ), the proposed structure has another series resonant circuit induced by an additional ground current path. The parasitic parameters from the lower substrate ( L d , C d , R d ) comprise the effect on the resonant frequency shift and Q‐factor improvement, because the total inductance decreases and the total capacitance increases by attaching a low substrate from the Q‐factor at a parallel resonance as follows.

Q = \frac{R}{ω_{o} L} = ω_{o} italicRC

…”

Section: Double‐layered Dgs Transmission Line Designmentioning

confidence: 99%

Design and characterization of the double‐layered defected ground structure transmission line with less radiation loss

Han

Kim

Yoon

et al. 2018

Micro & Optical Tech Letters

View full text Add to dashboard Cite

A double‐layered DGS transmission line is proposed with a smaller DGS size and less radiation loss. Changing the air boundary to a dielectric boundary reduces the effective electric length at the DGS aperture area. An equivalent circuit model is introduced to analyze the DGS transmission line and the resonator circuit designs. Due to the increase in the effective dielectric constant, the proposed structure can be realized with less sensitivity to metallic environments. From the experimental results, the proposed double‐layered DGS can achieve a reduction of 90.1% in size and insensitivity at up to 5 mm of separation from the DGS aperture to the metallic plate.

show abstract

Q = \frac{R}{ω_{o} L} = ω_{o} italicRC

…”

Section: Double‐layered Dgs Transmission Line Designmentioning

confidence: 99%

Design and characterization of the double‐layered defected ground structure transmission line with less radiation loss

Han

Kim

Yoon

et al. 2018

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…Also, the analytically calculated (MATLAB), circuit simulated (ADS), EM simulated (HFSS), measured fundamental resonance frequencies ( f r ), first spurious resonance frequencies ( f s 1 ), and normalized first spurious resonance frequencies ( η = f s 1 /f r ) are summarized in Table . In the circuit simulation, we chose the turn ratio n to be 0.36 where this optimum value was inferred from the 3‐dB bandwidth of the resonance calculated by the EM simulator .…”

Section: Stepped U‐slot Dgsmentioning

confidence: 99%

“…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

Self Cite

View full text Add to dashboard Cite

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....

show abstract

“…2(c) [13]. The L and the C are the inductance and the capacitance of the microstrip line corresponding to the length occupied by the DGS.…”

Section: Circuit Model and Resonance Propertiesmentioning

confidence: 99%

“…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

Self Cite

View full text Add to dashboard Cite

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. ⓒ

show abstract

Equivalent Circuit Model for a Simple Slot-Shaped DGS Microstrip Line

Cited by 21 publications

References 11 publications

Design and characterization of the double‐layered defected ground structure transmission line with less radiation loss

Design and characterization of the double‐layered defected ground structure transmission line with less radiation loss

Modeling stepped U‐slot DGS microstrip line

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

Contact Info

Product

Resources

About