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Related Concept Videos

Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the rated...
Three-Winding Transformers01:19

Three-Winding Transformers

Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
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Types Of Transformers01:16

Types Of Transformers

Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

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Inductance: Solid Cylindrical Conductor

To calculate the inductance of a solid cylindrical conductor, consider a 1-meter section of a non-magnetic, current-carrying conductor with radius r. Disregarding end effects and assuming uniform current density, Ampere's law helps determine the magnetic field inside the conductor. This law states that the magnetic field intensity H is concentric and constant within the conductor.
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Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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Published on: March 19, 2016

A novel cylindrical TE(2,1) mode converter.

D A Constable1, X S Fampris, K Ronald

  • 1Department of Physics, SUPA, University of Strathclyde, John Anderson Building, 107 Rottenrow, Glasgow G4 0NG, United Kingdom.

The Review of Scientific Instruments
|October 5, 2010
PubMed
Summary

A new Ka-band mode coupler efficiently converts waveguide modes using slotted designs. This compact device preferentially transmits the desired TE(2,1) mode, showing good performance across a wide frequency range.

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Area of Science:

  • Electromagnetics and Waveguide Technology
  • Microwave Engineering
  • Applied Physics

Background:

  • Mode converters are crucial components in microwave and millimeter-wave systems.
  • Efficiently converting between rectangular and cylindrical waveguide modes is challenging.
  • Existing designs often lack compactness or sufficient mode purity.

Purpose of the Study:

  • To design, construct, and test a novel, compact Ka-band mode coupler.
  • To convert the fundamental TE(1,0) mode in rectangular waveguides to the TE(2,1) mode in cylindrical waveguides.
  • To achieve preferential propagation of the TE(2,1) mode by suppressing the TE(1,1) mode.

Main Methods:

  • Utilized a novel design featuring longitudinal slots in specific current regions.
  • Employed numerical simulations for design optimization and performance prediction.
  • Constructed a prototype and conducted experimental measurements, including far-field analysis.

Main Results:

  • Achieved transmission of the TE(2,1) mode at levels better than -5 dB.
  • Demonstrated operation over a frequency range from approximately 37.5 to 41 GHz.
  • Experimental results showed good agreement with numerical simulations and analytical predictions.

Conclusions:

  • The novel coupler design successfully converts waveguide modes with good performance.
  • The device exhibits desirable characteristics such as mode purity, bandwidth, and ease of construction.
  • This compact mode coupler is suitable for applications prioritizing mode purity and bandwidth over transmission efficiency.