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01:28Standing Waves in a Cavity
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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:
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01:12Mesh Analysis for AC Circuits
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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...
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
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01:20Design Example: Capacitance Multiplier Circuit
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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Origami-based microwave absorber with a reconfigurable bandwidth.
Optics Letters
|March 15, 2021
Summary
This study introduces an origami-based absorber with reconfigurable bandwidth, offering four distinct models for tailored absorption performance. The novel 3D-printed design enables efficient energy dissipation and versatile structural transformation.
Area of Science:
- Electromagnetics, mechanics, and acoustics
- Metamaterials and advanced materials
Background:
- Reconfigurability is essential for advanced functionalities in electromagnetics, mechanics, and acoustics.
- Traditional structural absorbers often lack design flexibility and tunable performance.
Purpose of the Study:
- To demonstrate a novel origami-based absorber with reconfigurable bandwidth.
- To explore the relationship between structural transformation and absorption characteristics.
- To showcase the advantages of 3D printing for fabricating transformable absorbers.
Main Methods:
- Numerical simulations and experimental validation were employed.
- An origami-inspired structure was designed and fabricated using 3D printing.
- The absorber was analyzed in four configurations: flat sheet, single-arch-folded, double-arch-folded, and U-shaped strips.
- Absorption performance across different configurations was measured.
Main Results:
- The proposed structure exhibited four distinct absorption modes: no absorption, single-peak, dual-peak, and ultra-broadband absorption (3.4-18 GHz).
- The origami transformation effectively controlled and enhanced the absorption bandwidth.
- 3D printing facilitated the fabrication of complex transformable designs, including flat sheets and U-shaped strips.
- A significant bandwidth-enhancement effect was observed through structural reconfiguration.
Conclusions:
- The origami-based absorber offers a feasible strategy for tunable energy dissipation.
- The reconfigurable design provides a versatile platform for controlling electromagnetic, mechanical, or acoustic functionalities.
- 3D printing presents a superior method for prototyping such transformable structures.