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Related Concept Videos

Transmission Line Design Considerations01:23

Transmission Line Design Considerations

251
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
251
Lossless Lines01:23

Lossless Lines

205
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
205
Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

488
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
488
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

189
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
189
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

146
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
146
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

232
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
232

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Tapered transmission lines for terahertz systems.

Levi Smith, Walid Gomma, Hadi Esmaeilsabzali

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    |June 22, 2021
    PubMed
    Summary

    This study demonstrates effective terahertz (THz) transmission-line tapers for interconnecting components in complex THz System-on-Chip (TSoC) circuits. These tapers reduce signal loss by transitioning between different transmission line widths up to 2.0 THz.

    Area of Science:

    • Electrical Engineering
    • Terahertz (THz) Technology
    • Microwave Engineering

    Background:

    • Complex terahertz (THz) System-on-Chip (TSoC) circuits necessitate ultra-wideband, low-loss, and low-dispersion interconnections.
    • Transmission lines with varying dimensions and characteristics pose challenges for seamless integration.
    • Tapered transmission lines offer a solution for gradual impedance and dimensional transformation.

    Purpose of the Study:

    • To experimentally and computationally evaluate the effectiveness of transmission-line tapers for THz interconnections.
    • To demonstrate tapers for transitioning between different coplanar-strip transmission-line configurations.
    • To identify design constraints for tapers that minimize detrimental impacts on THz pulse propagation.

    Main Methods:

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  • Utilized experimental measurements and simulations to quantify taper efficacy.
  • Investigated frequencies up to 2.0 THz with 25 GHz spectral resolution.
  • Focused on transitions from 10 μm to 20-40 μm line widths in coplanar-strip configurations.

    • Main Results:

    • Demonstrated successful implementation of transmission-line tapers for THz interconnections.
    • Showcased tapers enabling transition from device-constrained (10 μm) to lower-loss (20-40 μm) dimensions.
    • Quantified the reduction in overall attenuation achieved through these tapered sections.

    Conclusions:

    • Transmission-line tapers are effective for reducing attenuation in THz interconnections.
    • The study provides design insights for optimizing tapered sections in TSoC circuits.
    • Minimal detrimental impact on THz pulse propagation was observed with optimized tapers.