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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:

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...

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:

Mesh Analysis for AC Circuits

Mesh Analysis for AC Circuits

In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...

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...

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Related Experiment Video

Updated: Nov 10, 2025

Fabrication and Characterization of Superconducting Resonators

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Split Ring Resonator-Based Bandstop Filter for Improving Isolation in Compact MIMO Antenna.

Hashinur Islam¹, Saumya Das², Tanweer Ali³

¹Department of Electronics and Communication Engineering, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Sikkim 737136, India.

Sensors (Basel, Switzerland)

|April 3, 2021

Summary

This summary is machine-generated.

A novel miniaturized MIMO antenna uses a split ring resonator (SRR) bandstop filter for high isolation without increasing size. This design achieves 39.25 dB isolation, crucial for high-data-rate wireless systems.

Keywords:

MIMO antenna SRR-based bandstop filter decoupling network

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Published on: March 23, 2017

Area of Science:

Wireless communication antenna design
Electromagnetics and applied physics

Background:

Increasing demand for high data rates necessitates advanced antenna solutions.
Multiple-Input Multiple-Output (MIMO) antennas are key for enhanced wireless connectivity.
Achieving high isolation in compact MIMO antennas remains a significant design challenge.

Purpose of the Study:

To develop a low-profile, miniaturized MIMO antenna with high isolation.
To investigate the effectiveness of a split ring resonator (SRR)-based bandstop filter as a decoupling network.
To ensure high isolation without compromising MIMO antenna dimensions.

Main Methods:

Designed a miniaturized MIMO antenna incorporating an SRR-based bandstop filter as a decoupling network.
Integrated two closely spaced monopole antenna elements with the SRR filter.
Employed open-circuit stub lines in the feeding network for impedance matching.

Main Results:

Achieved a high isolation of 39.25 dB at 2.61 GHz.
The antenna exhibited a peak gain of 3.8 dBi and 84% radiation efficiency.
Demonstrated excellent diversity performance with low envelope correlation coefficient (ECC < 0.12) and high diversity gain (DG > 9.95 dB).

Conclusions:

The proposed SRR-based decoupling network effectively enhances isolation in miniaturized MIMO antennas.
The antenna design is suitable for compact wireless devices requiring high performance.
This approach offers a viable solution for future high-data-rate wireless communication systems.