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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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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:
497
Parallel Resonance01:23

Parallel Resonance

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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:
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Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

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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...
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Series Resonance01:17

Series Resonance

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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...
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Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
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Updated: Dec 26, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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A Switchable High-Performance RF-MEMS Resonator with Flexible Frequency Generations.

Zeji Chen1,2,3, Xiao Kan1,2,3, Quan Yuan1,2

  • 1Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, P. R. China.

Scientific Reports
|March 18, 2020
PubMed
Summary
This summary is machine-generated.

This study presents a switchable radio frequency micro-electro-mechanical system (RF-MEMS) resonator capable of multi-frequency generation. Optimized electrodes enable high Q-factor operation across multiple whispering gallery modes, crucial for advanced wireless communications.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Physics

Background:

  • Multi-frequency resonators are essential for future wireless communication systems requiring reconfigurable and compact devices.
  • Existing resonators often lack the ability to generate multiple frequencies within a single device, limiting their application scope.

Purpose of the Study:

  • To develop a switchable radio frequency micro-electro-mechanical system (RF-MEMS) resonator with multi-frequency generation capabilities.
  • To optimize electrode configurations for effective excitation and sensing of multiple whispering gallery modes (WGMs).

Main Methods:

  • Design and fabrication of an RF-MEMS resonator utilizing multiple electrodes for driving and sensing.
  • Optimization of electrode span angle for simultaneous excitation of WGMs (2nd to 7th modes).
  • Theoretical analysis of driving/sensing principles and investigation of air damping effects on resonator performance.

Main Results:

  • Demonstrated simultaneous excitation of multiple WGMs with high quality (Q) values exceeding 10^4.
  • Achieved frequency ranges from 53-176 MHz and 112-366 MHz for different resonator radii.
  • Showcased mode enhancement and suppression using multi-electrode configurations, improving spectrum peak by over 6 dB.
  • Observed significant Q-value improvement (at least two times) in vacuum due to reduced air damping.

Conclusions:

  • The developed switchable RF-MEMS resonator offers high-performance multi-frequency generation.
  • This technology can significantly reduce power consumption, simplify circuitry, and minimize footprint in advanced RF front-end systems.
  • The findings have strong potential for applications in next-generation wireless communication technologies.