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A Balanced Substrate Integrated Waveguide Phase Shifter with Wideband Common-Mode Suppression.

Wei Zhang1,2,3, Jin Shi1,2,3, Gangxiong Wu1,2,3

  • 1School of Information Science and Technology, Nantong University, Nantong 226019, China.

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|February 25, 2023
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Summary
This summary is machine-generated.

This study introduces a novel slotted substrate integrated waveguide (SIW) phase shifter. It achieves wideband common-mode (CM) suppression and a wide phase shift range, offering a simple, effective design for RF applications.

Keywords:
balanced phase shiftercommon-mode suppressionsubstrate integrated waveguidewideband

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Microwave Engineering

Background:

  • Substrate Integrated Waveguides (SIW) are essential components in modern microwave circuits.
  • Developing balanced phase shifters with effective common-mode (CM) suppression is crucial for signal integrity.
  • Existing designs often face limitations in bandwidth and phase shift range for CM suppression.

Purpose of the Study:

  • To propose and validate a novel slotted substrate integrated waveguide (SIW) based balanced phase shifter.
  • To achieve wideband common-mode (CM) suppression and a wide phase shift range.
  • To demonstrate a simple and manufacturable structure with high performance.

Main Methods:

  • Utilizing the mode selectivity of TE20 and TE10/TE30 modes within the SIW for differential-mode (DM) signal transmission and CM suppression.
  • Incorporating slots to enhance the bandwidth of CM suppression.
  • Employing a phase slope counteraction between slots and delay lines to achieve wideband phase shift with low deviation.

Main Results:

  • The proposed SIW phase shifter demonstrates wideband CM suppression with a relative bandwidth of up to 59%.
  • Achieved wide phase shift ranges (45°, 90°, 135°, 180°) with a relative operating bandwidth of 20% for each.
  • Exhibited low insertion loss (minimum 0.41 dB) and high return loss (greater than 15 dB).

Conclusions:

  • The developed slotted SIW phase shifter offers significant advantages in wideband CM suppression and phase shift capability.
  • The design presents a simple, easily fabricated structure suitable for various RF applications.
  • The performance metrics surpass those of current state-of-the-art phase shifters.