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Related Concept Videos

Bandpass Sampling01:17

Bandpass Sampling

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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....
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Passive Filters01:27

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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.
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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:
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Single-layer angle-selective surface with broad frequency bandwidth and wide angular passband for X-band

Wen Fu, Peng Mei, Gert Frølund Pedersen

    Optics Express
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    Summary

    This study introduces an angle-selective surface (ASS) for stable angular selectivity. The novel metasurface design demonstrates a wide angular passband across a broad frequency range, validated by simulations and experiments.

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    Area of Science:

    • Electromagnetics
    • Metamaterials
    • Antenna Theory

    Background:

    • Metasurfaces offer unique electromagnetic wave manipulation capabilities.
    • Angle-selective surfaces (ASS) are crucial for applications requiring directional control of electromagnetic waves.
    • Achieving broad frequency bandwidth and wide angular passband simultaneously remains a challenge.

    Purpose of the Study:

    • To propose and analyze a novel single-layer dual-resonance metasurface for angle-selective surface (ASS) applications.
    • To investigate the frequency bandwidth and angular passband characteristics of the proposed ASS.
    • To validate the design through circuit modeling, electromagnetic simulations, and experimental measurements.

    Main Methods:

    • Design of a unit cell comprising square and X-shaped slot resonators for dual-resonance behavior.
    • Analysis of the ASS principle from a circuit perspective, establishing and verifying a dual-resonance equivalent circuit model.
    • Electromagnetic simulations and experimental fabrication and measurement to assess performance.

    Main Results:

    • The proposed ASS exhibits good and stable angular selectivity under TE polarization between 10.5 and 11.5 GHz.
    • An angular passband (S21 > -1 dB) was observed, spanning up to 57° at 10.5 GHz and a minimum of 42° at 11.5 GHz.
    • Experimental results closely align with simulation data, confirming the wide angular passband and broad frequency range.

    Conclusions:

    • The developed single-layer dual-resonance metasurface effectively functions as an angle-selective surface.
    • The design achieves a desirable combination of broad frequency bandwidth and wide angular passband.
    • The validated circuit model provides a robust framework for understanding and designing similar ASS devices.