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Related Concept Videos

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:
Parallel Resonance01:23

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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:

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An ultra-wide rejection suppressing cell for microwave applications.

Farzin Shama1, Milad Ekhteraei2, Mohsen Hayati3

  • 1Department of Electrical Engineering, Ker.C., Islamic Azad University, Kermanshah, Iran.

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|July 6, 2026
PubMed
Summary

A novel suppressing cell (SC) on RO4003 substrate acts as a low-pass filter for microwave circuits. It offers an ultra-wide stopband up to 50 GHz with minimal insertion loss and compact size.

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Area of Science:

  • Microwave Engineering
  • Materials Science

Background:

  • Microwave circuits require effective filtering components.
  • Suppressing cells (SC) are crucial for signal integrity in high-frequency applications.

Purpose of the Study:

  • To design and fabricate a novel suppressing cell (SC) for microwave circuits.
  • To characterize the filtering performance and physical attributes of the SC.

Main Methods:

  • Implementation of an SC on a RO4003 substrate.
  • Experimental characterization using S-parameters and group delay measurements.

Main Results:

  • The SC functions as a low-pass filter with a 5.7 GHz cutoff frequency.
  • Achieved an ultra-wide stopband from 6.3 GHz to 50 GHz with significant attenuation.
  • Demonstrated low insertion loss (0.5 dB at 1.3 GHz) and compact dimensions (15.3 mm × 10.5 mm).

Conclusions:

  • The novel SC effectively suppresses unwanted frequencies in microwave circuits.
  • The designed SC meets requirements for low-pass filtering with excellent stopband performance.
  • The compact size and stable group delay make it suitable for practical microwave applications.