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Related Concept Videos

Passive Filters01:27

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...
Active Filters01:25

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:
Design Example01:23

Design Example

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...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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:
Wave Parameters01:10

Wave Parameters

The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
Bandpass Sampling01:17

Bandpass Sampling

In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2. The spectrum...

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Multimode waveguide: a low-pass filter; supplementary comments.

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Related Experiment Video

Updated: Jun 16, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
07:28

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Multimode waveguide: a low pass filter.

K H Steiner, M Tréheux, R Bouillie

    Applied Optics
    |February 4, 2010
    PubMed
    Summary

    A multimode waveguide functions as a low-pass filter for modulation, as demonstrated by a ray model. This study calculates and analyzes the system's response function for an ideal, straight, and loss-free waveguide.

    Area of Science:

    • Optics and Photonics
    • Waveguide Theory

    Background:

    • Waveguides are crucial components in transmitting optical signals.
    • Understanding their behavior under modulation is essential for signal integrity.

    Purpose of the Study:

    • To investigate the modulation filtering characteristics of multimode waveguides.
    • To model a multimode waveguide using a ray approach.

    Main Methods:

    • Representing the multimode waveguide using a ray model.
    • Calculating the system's response function.

    Main Results:

    • The multimode waveguide acts as a low-pass filter concerning modulation.
    • The response function was derived for an ideal, straight, and loss-free system.

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    Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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    Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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    Conclusions:

    • The ray model effectively demonstrates the low-pass filtering nature of multimode waveguides.
    • This finding has implications for signal processing in optical systems.