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Related Concept Videos

Design Example01:23

Design Example

350
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
350
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

293
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:
293
Design Example: Underdamped Parallel RLC Circuit01:17

Design Example: Underdamped Parallel RLC Circuit

352
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...
352
Parallel Resonance01:23

Parallel Resonance

246
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:
246
Active Filters01:25

Active Filters

883
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
883
Passive Filters01:27

Passive Filters

570
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
570

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Design of a Frequency Selective Rasorber Based on a Band-Patterned Octagonal Ring.

Xiaojun Huang1, Yutao Ma1, Xiaoyan Li2

  • 1College of Communication and Information Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.

Materials (Basel, Switzerland)
|March 11, 2023
PubMed
Summary

This study introduces a novel dual-polarization frequency-selective rasorber (FSR) with a wide passband and dual absorption bands. Experimental verification confirms its performance, making it suitable for advanced electromagnetic applications.

Keywords:
band-patterned octagonal ringdual-polarizationfrequency selective rasorberin-bandlow-profile

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Area of Science:

  • Electromagnetic Metamaterials
  • Microwave Engineering
  • Applied Physics

Background:

  • Frequency-selective surfaces (FSS) are crucial for controlling electromagnetic wave propagation.
  • Existing FSS designs often struggle with achieving simultaneous wideband absorption and low insertion loss passbands.
  • Developing low-profile, dual-polarized devices with stable angular performance remains a challenge.

Purpose of the Study:

  • To design and investigate a novel, low-profile, dual-polarization frequency-selective rasorber (FSR).
  • To achieve a wide passband with low insertion loss situated between two distinct absorptive bands.
  • To analyze the FSR's working mechanism and validate its performance through simulation and experimentation.

Main Methods:

  • Design of a lossy frequency selective surface using band-patterned octagonal ring and dipole slot elements.
  • Equivalent circuit modeling to explain parallel resonance and electromagnetic behavior.
  • Investigation of surface current and energy distribution to elucidate the working principle.
  • Electromagnetic simulations to predict performance metrics under normal incidence.
  • Fabrication and experimental verification of the designed FSR prototype.

Main Results:

  • Achieved a wide reflectionless bandwidth (S11 < -10 dB) from 5.2 to 14.8 GHz.
  • Demonstrated a low insertion loss passband (S21 > -3 dB) between 9.62 and 11.72 GHz.
  • Obtained lower and upper absorptive bandwidths from 5.02 to 8.80 GHz and 12.94 to 14.89 GHz, respectively.
  • Confirmed dual-polarization capability and angular stability of the proposed FSR.
  • Experimental results closely matched simulation predictions.

Conclusions:

  • The proposed novel octagonal ring and dipole slot-based FSR effectively integrates a low-loss passband between dual absorption bands.
  • The FSR exhibits excellent dual-polarization and angular stability, validated by both simulation and experimental measurements.
  • This design offers a promising solution for applications requiring selective control over multiple frequency ranges in a compact form factor.