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Related Concept Videos

Transmission Line Design Considerations01:23

Transmission Line Design Considerations

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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...
159
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

101
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
101
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

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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...
111
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

806
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Clipper Circuit01:18

Clipper Circuit

471
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
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Lossless Lines01:23

Lossless Lines

142
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,...
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Compact Bandwidth-Enhanced 180-Degree Phase Shifter Using Edge-Coupled Multi-Microstrip and Artificial Transmission

Ding He1,2, Jingxin Fan1,2, Zhiqiang Zhu2,3

  • 1Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.

Micromachines
|September 28, 2023
PubMed
Summary

This study introduces a novel compact broadband 180-degree phase shifter using edge-coupled multi-microstrip lines and artificial transmission lines. The design significantly reduces chip area and enhances bandwidth for cost-effective fabrication.

Keywords:
GaAsartificial transmission linebandwidth enhancementcompactedge coupledmicrostrip linephase shifter

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Area of Science:

  • Electrical Engineering
  • Microwave Engineering
  • Circuit Design

Background:

  • Compactness in phase shifter design is crucial for reducing fabrication costs.
  • Existing designs often face limitations in bandwidth and chip area.
  • Wideband phase shifters are essential components in various RF and microwave systems.

Purpose of the Study:

  • To present a novel compact broadband 180-degree phase shifter structure.
  • To achieve enhanced bandwidth and significantly reduced chip area compared to conventional methods.
  • To minimize insertion loss and phase error for improved performance.

Main Methods:

  • Proposed a configuration combining edge-coupled multi-microstrip lines (ECMML) and an artificial transmission line (ATL) with dual-shorted inductors.
  • Incorporated periodic shunt loads of capacitors to reduce line length.
  • Designed and verified the structure using 0.15-micrometer GaAs pHEMT technology for a wideband switched network.

Main Results:

  • Achieved a significant reduction in line length by 35.8% compared to conventional designs.
  • The designed phase shifter demonstrated an insertion loss < 2 dB and return loss > 12 dB.
  • Exhibited a maximum phase error < 0.6° and channel amplitude difference < 0.1 dB across 10-20 GHz.

Conclusions:

  • The novel structure offers a viable solution for compact and high-performance broadband phase shifters.
  • The design advantages include enhanced bandwidth and reduced chip area, leading to lower fabrication costs.
  • The achieved performance metrics validate the effectiveness of the proposed ECMML and ATL configuration.