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Related Concept Videos

Passive Filters01:27

Passive Filters

536
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...
536
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....
171

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A Dual-Passband Frequency Selective Surface with High Angular Stability and Polarization Insensitivity.

Yi Li1, Yan Ma1, Peng Ren1

  • 1The State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China.

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Summary

A novel dual-passband frequency selective surface (FSS) offers stable transmission across wide angles for both TE and TM modes. This polarization-insensitive design achieves high performance for dual-band applications.

Keywords:
dual passbandfrequency selective surface (FSS)high angular stabilitypolarization insensitivity

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Area of Science:

  • Electromagnetics and Applied Physics
  • Metamaterials and Metasurfaces
  • Microwave Engineering

Background:

  • Frequency Selective Surfaces (FSS) are crucial for filtering electromagnetic waves.
  • Achieving dual-passband characteristics with high angular stability and polarization insensitivity remains a challenge.
  • Existing FSS designs often struggle with performance degradation at oblique incidence angles.

Purpose of the Study:

  • To propose and validate a novel dual-passband frequency selective surface (FSS).
  • To demonstrate high angular stability and polarization insensitivity for the designed FSS.
  • To achieve efficient dual-band filtering at specific microwave frequencies.

Main Methods:

  • A unit structure comprising circular, annular, and cross apertures was designed.
  • Electromagnetic simulations were performed to analyze the FSS performance.
  • Experimental measurements were conducted to validate the simulated results.

Main Results:

  • The designed FSS exhibits dual-passband characteristics at 8.45 GHz and 12.76 GHz.
  • Insertion loss was maintained below 1 dB for both passbands.
  • Stable transmission was observed for TE modes up to 86° and TM modes up to 83°.
  • Excellent agreement between simulated and experimental results was achieved.

Conclusions:

  • The proposed FSS design successfully achieves dual-passband filtering with excellent angular stability and polarization insensitivity.
  • The demonstrated performance validates the feasibility of the proposed unit structure for advanced microwave applications.
  • This work contributes a robust FSS design for applications requiring dual-band frequency selection under diverse incidence conditions.