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Bandwidth broadening for stripline circulator.

Hsien-Wen Chao1, Shi-Yao Wu1, Tsun-Hsu Chang1

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Summary
This summary is machine-generated.

This study broadens circulator operating bandwidth by optimizing a double-Y junction design. The overlapping resonant conditions create a wide bandwidth for S-band communication applications.

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Microwave Engineering

Background:

  • Circulators are essential components in microwave systems.
  • Broadening operating bandwidth is a key challenge in circulator design.

Purpose of the Study:

  • To demonstrate a method for broadening the operating bandwidth of a circulator.
  • To design and fabricate a broadband circulator for S-band communication.

Main Methods:

  • Detailed analysis and simulation of a double-Y junction circulator.
  • Optimization of the central stripline shape using a modified resonant equation.
  • Electromagnetic-wave simulation incorporating simulated bias magnetic field.

Main Results:

  • A circulator design exhibiting broad bandwidth due to overlapping resonant conditions.
  • Fabricated S-band circulator achieved an operating range of 1643-2027 MHz.
  • Measured performance showed insertion loss < 0.35 dB, and reflection/isolation > 20 dB, matching simulations.

Conclusions:

  • The modified resonant equation effectively predicts conditions for broad bandwidth.
  • The optimized double-Y junction circulator design is suitable for S-band communication.
  • The simulation and fabrication results validate the proposed bandwidth enhancement technique.