scholarly journals Influence of Microcracks on Silver/Polydimethylsiloxane-Based Flexible Microstrip Transmission Lines

2020 ◽  
Vol 11 (1) ◽  
pp. 5
Author(s):  
Daye Ding ◽  
Ruozhou Li ◽  
Jing Yan ◽  
Jiang Liu ◽  
Yuming Fang ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Transmission Lines ◽  
Equivalent Circuit Model ◽  
Circuit Element ◽  
Actual Measurement ◽  
Rf Signals ◽  
Rf Devices ◽  
Composite Conductor ◽  
Flexible Radio ◽  
Transmission And Reflection

Microcrack is commonly seen as a defect in materials that affects the performance of flexible radio frequency (RF) devices. Here, we investigate the influence of microcracks on the RF characteristics of flexible microstrip by stretching flexible microstrip that is based on polydimethylsiloxane (PDMS) substrate and an Ag microparticles/PDMS (AgMP/PDMS) composite conductor. The RF characteristics of the microstrip were monitored with a variety of tensile displacements. An equivalent circuit model of the microstrip with microcracks was proposed to reveal the mechanisms. The fitting results matched the actual measurement well. In addition, the morphology of the microcracks was characterized by SEM and the direct-current (DC) resistance was monitored. The results show that the changes in equivalent circuit element parameters (R, L, C) are due to the change in the conductive pathways, which affect the transmission and reflection of the RF signals.

Scalable wideband equivalent circuit model for silicon-based on-chip transmission lines

2017 ◽  
Vol 38 (6) ◽  
pp. 065004
Author(s):  
Hansheng Wang ◽  
Weiliang He ◽  
Minghui Zhang ◽  
Lu Tanh
Keyword(s):  
Equivalent Circuit ◽  
Transmission Lines ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
On Chip ◽  
Silicon Based

Lightning Overvoltage Analysis and Calculation of 330kV Overhead Transmission Line

2014 ◽  
Vol 556-562 ◽  
pp. 1588-1591
Author(s):  
Xiu Bin Zhang ◽  
Ding Jun Wen ◽  
Ya Ming Sun ◽  
Hong Gang Chen
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
High Voltage ◽  
Transmission Lines ◽  
Equivalent Circuit Model ◽  
Voltage Level ◽  
High Voltage Transmission Line ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Pollution Flashover

Lighting is one of the important reasons of transmission line trip accident. For 330kV and above ultra high voltage transmission line, lighting flashover more frequently occur. To reduce tripping rate effectively and fundamentally, lightning over voltage level should be analyzed besides anti-pollution flashover. In this paper, a simplified equivalent circuit model of a 330kV overhead transmission lines is established. The lightning over voltage of the transmission is analyzed and calculated. Method to reduce the lightning overvoltage is discussed.

Single-layer fully-planar extended-composite right-/left-handed transmission lines based on substrate integrated waveguides for dual-band and quad-band applications

2013 ◽  
Vol 5 (3) ◽  
pp. 213-220 ◽  
Author(s):  
Miguel Durán-Sindreu ◽  
Jordi Bonache ◽  
Ferran Martín ◽  
Tatsuo Itoh
Keyword(s):  
Equivalent Circuit ◽  
Transmission Lines ◽  
Metal Layer ◽  
Equivalent Circuit Model ◽  
Single Layer ◽  
Dual Band ◽  
Lumped Element ◽  
Left Handed ◽  
Lumped Elements ◽  
Band Pass

The implementation and application of single-layer fully-planar extended-composite right-/left-handed transmission lines (E-CRLH TLs) in substrate-integrated waveguide (SIW) technology are presented. The multiband CRLH behavior of these artificial lines is explained by considering the lumped element equivalent circuit model. The potential of these lines for dual-band and quad-band applications is demonstrated by designing and fabricating a quad-band Y-junction power divider and two dual-band band-pass filters. The main relevant advantage of SIW-based E-CRLH TLs over other E-CRLH lines is fabrication simplicity, since only a single metal layer must be etched and lumped elements are avoided. The fabricated prototypes exhibit very reasonable performance. It is remarkable that for dual-band band-pass filters, standard Chebyshev responses can be obtained to a very good approximation.

scholarly journals CRLH Transmission Lines for Telecommunications: Fast and Effective Modeling

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Juanjuan Gao ◽  
Guizhen Lu
Keyword(s):  
Resonance Frequency ◽  
Equivalent Circuit ◽  
Transmission Lines ◽  
Cell Model ◽  
Extraction Procedure ◽  
Equivalent Circuit Model ◽  
Parameter Extraction ◽  
Circuit Model ◽  
Unit Cell ◽  
Parallel Resonance

A different parameter extraction approach based on zero immittances for composite right/left-handed (CRLH) structure is presented. For lossless unit cell equivalent circuit model, LC parameters of series and parallel branches are extracted according to series resonance frequency and parallel resonance frequency, respectively. This approach can be applied to symmetric and unbalanced CRLH structures. The parameter extraction procedure is provided and validated by T-type unit cell model. The responses of distributed prototype and extracted equivalent LC circuit model are in good agreement. The equivalent circuit modeling can improve the degree of freedom in the CRLH TLs design. This parameter extraction method provides an effective and straightforward way in CRLH metamaterials design and applications in telecommunication systems.

scholarly journals Parameter Extraction for Equivalent Circuit Model of RF Devices Based on a Hybrid Optimization Method

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1133 ◽  
Author(s):  
Zhimin Guan ◽  
Peng Zhao ◽  
Qizhong Lao ◽  
Xianbing Wang ◽  
Gaofeng Wang
Keyword(s):  
Equivalent Circuit ◽  
Global Minimum ◽  
Extraction Procedure ◽  
Equivalent Circuit Model ◽  
Optimization Method ◽  
Parameter Extraction ◽  
Circuit Model ◽  
Spiral Inductor ◽  
Rf Devices ◽  
Global Minimum Search

One major difficulty of parameter extraction for an equivalent circuit lies in applying an optimization algorithm to efficiently approach the global minimum. Traditional genetic algorithm (GA) is able to find the global minimum but it has very low convergence rate. On the other hand, direct search method may be easily trapped in local minima. In this work, an improved parameter extraction method which is capable of effectively performing the global minimum search is proposed. This method combines GA and Powell’s method to efficiently determine circuit elements of an equivalent circuit model. A spiral inductor and an interdigital capacitor are used as design examples to illustrate the extraction procedure and validate the proposed hybrid method.

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