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Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...

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Butler Matrix Based on Substrate Integrated Waveguide Without Crossover and Phase Shifter for Millimeter Waves

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A novel 4x4 Butler matrix using Substrate Integrated Waveguide (SIW) technology offers a compact, low-loss beamforming solution for 5G applications. This design eliminates crossovers and phase shifters, enhancing wideband performance for millimeter-wave systems.

Keywords:
5GButler matrixHybrid couplerSubstrate integrated waveguideVias

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Area of Science:

  • Electrical Engineering
  • Antenna Theory
  • Microwave Engineering

Background:

  • A novel low-loss 4x4 Butler Matrix for 26 GHz operation is presented.
  • The design utilizes an inscribed structure, differing from traditional beamforming networks for 5G.
  • It employs Substrate Integrated Waveguide (SIW) technology for a compact, wideband implementation.

Purpose of the Study:

  • To design and demonstrate a compact, wideband 4x4 Butler Matrix for 5G millimeter-wave applications.
  • To eliminate structural discontinuities, junction losses, and frequency-dependent phase errors inherent in conventional designs.
  • To enable planar and monolithic integration for compact beamforming front ends.

Main Methods:

  • The Butler matrix comprises four hybrid couplers without crossovers or phase shifters.
  • Interdigital and non-metallic vias are incorporated into the coupler design to reduce size and increase bandwidth.
  • Simulations were performed using CST software, and the design was implemented on a Rogers 8085 substrate, interfaced with SIW slot antennas.

Main Results:

  • The matrix achieved an error magnitude loss of 1 dB and a phase error of 1.7°.
  • A broad operational bandwidth of 3 GHz was obtained.
  • Measured results demonstrated four phase-scanning states with return losses below -10 dB at 26 GHz.

Conclusions:

  • The proposed Butler matrix provides a compact, efficient, and low-loss beamforming solution for 5G.
  • It exhibits distinct scanning features without requiring crossovers or phase shifters.
  • The design is well-suited for millimeter-wave beamforming front ends in 5G and future communication systems.