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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

272
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
272
Parallel Resonance01:23

Parallel Resonance

224
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
224
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

954
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
954
Series Resonance01:17

Series Resonance

196
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
196
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

324
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
324
Resonance in an AC Circuit01:26

Resonance in an AC Circuit

2.1K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
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A Multiband Millimeter-Wave Rectangular Dielectric Resonator Antenna with Omnidirectional Radiation Using a Planar

Tarek S Abdou1, Salam K Khamas1

  • 1Communications Research Group, Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK.

Micromachines
|September 28, 2023
PubMed
Summary

This study introduces a novel millimeter-wave (mmWave) dielectric resonator antenna (DRA) with an omnidirectional pattern, achieved using a planar feed network. This versatile, multiband antenna is validated for on-body and off-body communications.

Keywords:
dielectric resonator antennammWave communicationsmultibandomnidirectional antenna

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Area of Science:

  • Electromagnetics and Wave Propagation
  • Antenna Theory and Design
  • Microwave Engineering

Background:

  • Dielectric resonator antennas (DRAs) are widely used due to their desirable characteristics.
  • Achieving omnidirectional radiation patterns from rectangular DRAs presents unique design challenges.
  • Existing literature lacks reports on planar feed networks for omnidirectional radiation in rectangular DRAs.

Purpose of the Study:

  • To present a novel millimeter-wave (mmWave) dielectric resonator antenna (DRA) with an omnidirectional radiation pattern.
  • To demonstrate the efficacy of a planar feed network for achieving omnidirectional radiation from a rectangular DRA.
  • To explore the multiband capabilities and radiation characteristics of the proposed antenna design.

Main Methods:

  • Design and simulation of a rectangular dielectric resonator antenna (DRA).
  • Integration of a planar feed network to excite specific resonant modes.
  • Excitation of degenerate TE121/TE211 modes for omnidirectional radiation at 28.5 GHz.
  • Excitation of the TE111 fundamental mode and feeding ring-slot resonance for broadside radiation at 17.5 GHz and 23 GHz.

Main Results:

  • The proposed antenna achieved an omnidirectional pattern with 1.9% bandwidth and 4.3 dBi gain at 28.5 GHz.
  • Triple-band operation was demonstrated, with distinct radiation patterns at different frequencies.
  • Simulated results were validated through physical measurements, showing good agreement.

Conclusions:

  • The novel planar feed network successfully enables omnidirectional radiation from a rectangular DRA.
  • The proposed antenna exhibits versatile multiband operation suitable for various communication applications.
  • The validated design offers a promising solution for on-body and off-body communication systems.