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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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Parallel-Coupled Microstrip-Lines-Based Miniaturized Balanced Bandpass Filters with Flexible Differential-Fed I/O

Chuan Shao1,2, Guijie Liu1,2, Rong Cai1,2

  • 1School of Information Engineering, Jiangsu College of Engineering and Technology, Nantong 226000, China.

Micromachines
|November 27, 2025
PubMed
Summary

This study introduces a miniaturized balanced bandpass filter with flexible input/output configurations. The novel design offers excellent signal suppression and compact size, crucial for modern RF systems.

Keywords:
balanced filtercommon mode rejectionflexible input/outputminiaturized sizewideband response

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Microwave Engineering

Background:

  • Miniaturized filters are essential for compact Radio Frequency (RF) front-end modules.
  • Conventional balanced bandpass filters often lack flexible input/output (I/O) configurations.
  • Achieving high common-mode and differential-mode suppression simultaneously is a design challenge.

Purpose of the Study:

  • To design and develop a miniaturized balanced bandpass filter with flexible I/O functionality.
  • To enhance common-mode suppression without degrading differential-mode performance.
  • To demonstrate the filter's suitability for integration into compact RF systems.

Main Methods:

  • Design of a balanced bandpass filter using parallel-coupled microstrip lines.
  • Implementation of two distinct, symmetrically arranged I/O port configurations (horizontal and vertical).
  • Introduction of an asymmetrical quarter-wavelength open-circuited stub for improved common-mode suppression.

Main Results:

  • The proposed filter exhibits excellent differential-mode and common-mode suppression in both I/O configurations.
  • The asymmetrical stub significantly broadens the common-mode suppression bandwidth.
  • Fabricated prototypes show good agreement between simulated and measured results, confirming the design's feasibility.
  • Achieved highly compact filter sizes suitable for modern RF modules.

Conclusions:

  • The developed miniaturized balanced bandpass filter offers flexible I/O functionality and superior signal suppression.
  • The novel design, particularly the asymmetrical stub, effectively enhances common-mode rejection.
  • The filter's compact size and performance make it a valuable component for next-generation RF front-end modules.