Equivalent Lumped Parameters for a Bend in a Two-Wire Transmission Line.

An accurate acoustic model of a tube in the millimeter or sub-millimeter size should include the losses that occur due to viscosity and thermal conduction, collectively termed thermoviscous losses. These losses are prominent in a boundary layer near the tube walls. Under the assumption that the boundary layer is thick compared to a characteristic geometry length, such as the radius for a circular cross-section, and fills out the entire cross-section, the tube can be described via a lumped parameter model. The lumped parameters have been known for several decades for a tube with circular cross-section, but the equilateral triangular tube has only been investigated in terms of transmission line parameters. The lumped parameters have here been established for the equilateral triangular tube as a truncated series solution of the transmission line parameters. One result observed is that the lumped parameter model for a triangular tube has 38% more viscous loss than a circular tube for a given area.

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Fractional Lumped Parameter Modeling of Transformer Windings under VFTO

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.494-495.1529 ◽

2014 ◽

Vol 494-495 ◽

pp. 1529-1533

Author(s):

Gui Shu Liang ◽

Guang Bo Zhang ◽

Xin Liu

Keyword(s):

Transmission Line ◽

Lumped Parameter Model ◽

Voltage Distribution ◽

High Frequencies ◽

Simulation Process ◽

Lumped Parameter ◽

Lumped Parameter Modeling ◽

Lumped Parameters ◽

Simulation Results ◽

Transient Overvoltage

Very fast transient overvoltage (VFTO) is very dangerous for the transformer which is directly connected to gas insulated substations (GIS). At the same time, due to the continuous increasing of operating frequency in the power system, under the high frequencies of the transmission line calculation and simulation process, it is necessary to consider the frequency-dependent properties of the parameter. In order to study the voltage distribution in transformer windings under VFTO, a new Lumped parameter model which takes into account the fractional characteristics is proposed, named fractional lumped parameter model (FLP). The model divides each turn of transformer windings into proper sections, whose parameters are all lumped parameters. Finally it shows the correctness and validity of the model through the comparation of the experiment datas and simulation results.

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A compact CPW-fed wideband metamaterial-inspired antenna for GSM, WLAN/Wi-Fi, and WiMAX applications

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078716000350 ◽

2016 ◽

Vol 9 (3) ◽

pp. 567-571 ◽

Cited By ~ 1

Author(s):

Ashish Gupta ◽

Raghvendra Kumar Chaudhary

Keyword(s):

Transmission Line ◽

Coplanar Waveguide ◽

Ground Plane ◽

Radiation Efficiency ◽

Asymmetric Structure ◽

Impedance Bandwidth ◽

Radiation Characteristics ◽

Average Gain ◽

Lumped Parameters

A compact coplanar waveguide (CPW)-fed wideband metamaterial-inspired antenna is designed and developed in this paper. The proposed structure is an asymmetric structure in which three rectangular stubs are employed between signal patch and CPW ground plane. It is demonstrated that these stubs provides lumped parameters of conventional epsilon-negative transmission line (ENG-TL). As an advantage of these stubs proposed antenna operates on 1.67–2.76 GHz with −10 dB impedance bandwidth of 49.2%. The proposed antenna having small electrical size of 0.17λ0 × 0.35λ0 × 0.01λ0 at fo = 2.21 GHz. The simulated average gain and radiation efficiency of the proposed antenna is 1.61 dB and 96.33% respectively throughout the bandwidth. Properties such as smaller electrical size, simpler design, consistent radiation characteristics, and ease of fabrication are making this antenna suitable for GSM, WLAN/Wi-Fi, Bluetooth, and WiMAX applications.

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New time-domain model for active mode locking, based on the transmission line laser model

IEE Proceedings J Optoelectronics ◽

10.1049/ip-j.1989.0042 ◽

1989 ◽

Vol 136 (5) ◽

pp. 264 ◽

Cited By ~ 19

Author(s):

A.J. Lowery

Keyword(s):

Transmission Line ◽

Time Domain ◽

Mode Locking ◽

Domain Model ◽

Active Mode ◽

Laser Model ◽

New Time

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Design method for antenna arrays employing ferrite printed transmission line phase shifters

IEE Proceedings - Microwaves Antennas and Propagation ◽

10.1049/ip-map:20020146 ◽

2002 ◽

Vol 149 (1) ◽

pp. 33-40 ◽

Cited By ~ 5

Author(s):

A.D. Brown ◽

L.C. Kempel ◽

J.L. Volakis

Keyword(s):

Transmission Line ◽

Antenna Arrays ◽

Design Method ◽

Phase Shifters

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Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200208 ◽

2020 ◽

Vol 92 (2) ◽

pp. 20502

Author(s):

Behrokh Beiranvand ◽

Alexander S. Sobolev ◽

Anton V. Kudryashov

Keyword(s):

Transmission Line ◽

Terahertz Radiation ◽

Transmission Lines ◽

Software Package ◽

Optical Pulses ◽

Capacitively Coupled ◽

Voltage Difference ◽

Left Handed ◽

Microwave Transmission ◽

Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

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