A New Calculation Method for the Characteristic Impedance of Transmission Lines With Modified Ground Structures or Perturbation

Lim, Jongsik; Lee, Jun; Lee, Jae‐Hoon; Han, Sang-Min; Ahn, Dal; Jeong, Yongchae

doi:10.2528/pier10052602

Cited by 20 publications

(11 citation statements)

References 25 publications

(47 reference statements)

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“…The input impedance is a key parameter for capturing the transmission characteristics [29,30]. In the numerical validation, the input impedance calculation is carried out to show the effectiveness of the proposed mesh procedure.…”

Section: Numerical Resultsmentioning

confidence: 99%

Reduced Peec Modeling of Wire-Ground Structures Using a Selective Mesh Approach

Song¹,

Dai²,

Su³

et al. 2012

PIER

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Abstract-The wire-ground electromagnetic coupling structures are quite common in avionics system electromagnetic compatibility (EMC) analysis. The increasing complexities of physical structures make electromagnetic modeling an increasingly tough task, and computational efficiency is desirable. In this paper, a novel selective mesh approach is presented for partial element equivalent circuit (PEEC) modeling where intense coupling parts are meshed while the remaining parts are eliminated. With the proposed approach, the meshed ground plane is dependent on the length and height of the above wires. Relevant compact formulae for determining mesh boundaries are deduced, and a procedure of general mesh generation is also given. A numerical example is presented, and a validation check is accomplished, showing that the approach leads to a significant reduction in unknowns and thus computation time and consumed memories, while preserving the sufficient precision. This approach is especially useful for modeling the electromagnetic coupling of wires and reference ground, and it may also be beneficial for other equivalent circuit modeling techniques.

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Section: Numerical Resultsmentioning

confidence: 99%

Reduced Peec Modeling of Wire-Ground Structures Using a Selective Mesh Approach

Song¹,

Dai²,

Su³

et al. 2012

PIER

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“…Two techniques [6,13] are usually used to compute Z c of microstrip line from S-parameters' behaviour of the line. The value extracted from the former technique is frequency dependent.…”

Section: Developed Extraction Methods For Z C Of Transmission Linementioning

confidence: 99%

Microstrip unequal Wilkinson power divider with 1:11 division ratio

Taher

Farrell

2015

Journal of Electromagnetic Waves and Applications

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In this paper, a 1:11 unequal microstrip Wilkinson power divider (WPD) is presented. Power division is a necessary function in most of the wireless/wireline communication systems. To design 1:11 WPD using an easy-to-fabricate microstrip technology, microstrip line having a very high characteristic impedance (Z c ) value of 315 Ω is needed. Realization of this value is impractical because too thin line is required. Defected ground structure (DGS) provides the hosting microstrip line with high inductance and modest capacitance values simultaneously. As a result, very high impedance could be implemented using practical lines. Novel analytical calculation method is developed to compute Z c of microstrip line loaded with DGS. It is found that circular-patterned DGS could be used to realize the required microstrip line. The designed WPD is fabricated and measured at centre frequency (f c ) equals 1 GHz. The measurements of insertion and reflection losses of the fabricated circuit as well as the isolation between the output ports are in a good agreement with the simulated responses of the designed circuit.

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“…6 clearly shows the effects of these modifications to the resonant frequencies. In practice, shape modification changes the current pattern of the filter, and distributes it along the flexural conductor surface instead of the original simple patch surface; thus, it increases the electrical length [14,15]. The rectangular slot perturbations are optimized to obtain even and odd modes resonant frequencies to be close to each other in order to realize the 3.5 GHz WiMAX passband.…”

Section: Dual-band Bandpass Filter Designmentioning

confidence: 99%

Novel Compact Microstrip Stepped-Impedance Resonator Using Computational Approach and Application to Dual-Band Bandpass Filters

Karimi

Babakan

2015

Wireless Pers Commun

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This paper discusses a novel multi-stub-loaded stepped-impedance resonator (MSLSIR) with a specific feeding structure. The fundamental and higher order modes of resonant frequencies of the stepped-impedance resonator are key parameters involved in the design of a dual-band bandpass filter (DBPF). However, since resonant frequencies are dependent on each other, the overall structure is not compact. The proposed MSLSIR has the advantage of flexible control over one resonant frequency while the other frequency is fixed. Furthermore, the utilization of isosceles right-angled triangular (IRT) and short-circuited stubs as loaded elements improves size miniaturization of DBPF when a low permittivity substrate is used. The analysis of the IRT stub is based on the coupling impedance formulas derived by integration of the associated Green's function. As an application, a DBPF is presented, which operates at 3.5 and 5.2 GHz, corresponding to the WiMAX and WLAN applications, respectively. In addition, a good stopband rejection, up to 3f 1 , is obtained using the defected ground structure technique. An overall good agreement between the calculated, simulated and measured results is observed, thereby confirming the effectiveness of the proposed method.

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A New Calculation Method for the Characteristic Impedance of Transmission Lines With Modified Ground Structures or Perturbation

Cited by 20 publications

References 25 publications

Reduced Peec Modeling of Wire-Ground Structures Using a Selective Mesh Approach

Reduced Peec Modeling of Wire-Ground Structures Using a Selective Mesh Approach

Microstrip unequal Wilkinson power divider with 1:11 division ratio

Novel Compact Microstrip Stepped-Impedance Resonator Using Computational Approach and Application to Dual-Band Bandpass Filters

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