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Passive Filters

Passive Filters

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 frequency...

Parallel Resonance

Parallel Resonance

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:

Characteristics of Series Resonant Circuit

Characteristics of Series Resonant Circuit

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:

Active Filters

Active Filters

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:

Series Resonance

Series Resonance

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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Related Experiment Video

Updated: May 24, 2026

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Broadband metamaterial absorber based on coupling resistive frequency selective surface.

LiangKui Sun¹, HaiFeng Cheng, YongJiang Zhou

¹Key Laboratory of Advanced Ceramic Fibers and Composites, College of Aerospace and Materials Engineering, National University of Defence Technology, Changsha 410073,China. slk_0_1999@yahoo.com.cn

|March 16, 2012

Summary

Researchers developed a wideband metamaterial absorber using a lossy frequency selective surface (FSS) and a metallic ground plane. This novel design achieves over 90% absorption across a broad 2-18 GHz frequency range.

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Area of Science:

Electromagnetics
Materials Science
Nanotechnology

Background:

Metamaterials offer unique electromagnetic properties.
Broadband absorbers are crucial for applications like stealth and sensing.
Existing absorbers often have limited bandwidth or complex structures.

Purpose of the Study:

To design and fabricate a compact, broadband metamaterial absorber.
To achieve high absorption across a wide frequency range (2-18 GHz).
To investigate the effect of coupled elements on absorption bandwidth.

Main Methods:

Design of a metamaterial unit cell with coupled crisscross and fractal square patches.
Fabrication of the metamaterial absorber.
Experimental measurement of absorption performance.
Analysis using equivalent circuit models and numerical calculations.

Main Results:

The metamaterial absorber exhibits reflectivity below -10 dB from 2-18 GHz.
Coupling between FSS elements enhances absorption bandwidth by creating a third absorption null.
Experimental results validate the numerical predictions.

Conclusions:

The proposed metamaterial absorber demonstrates broadband performance.
The design is compact and realizable.
This work contributes to the development of efficient electromagnetic wave absorbers.