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A Compact Wideband Millimeter-Wave Crossover for Phased Array Antenna Systems in Remote Sensing Applications.

Fayyadh H Ahmed1, Rola Saad1, Salam K Khamas1

  • 1Electromagnetics, Wireless Hardware & RF Devices Group, School of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK.

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Summary

A novel via-less microstrip crossover achieves a 2 dB insertion loss over a wide bandwidth, ideal for millimeter-wave applications. This compact design enhances phased array antenna systems for remote sensing.

Keywords:
crossovermicrostrip-to-coplanar waveguide transitionmillimeter wavephase array antennaremote sensing

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Microwave Engineering

Background:

  • Millimeter-wave (mmWave) systems require efficient signal routing.
  • Traditional microstrip crossovers often involve vias, increasing complexity and cost.
  • Phased array antennas in remote sensing demand high-performance feed networks.

Purpose of the Study:

  • To design and demonstrate a compact, wideband, via-less microstrip crossover.
  • To achieve excellent scattering parameters for improved antenna system efficiency.
  • To enable enhanced performance in remote sensing applications.

Main Methods:

  • Utilized stair-shaped microstrip line (MST) to ground-backed coplanar waveguide (GCPW) transitions.
  • Implemented vertical coupling between microstrip and coplanar hourglass microstrip patches.
  • Fabricated on a single-layer substrate for a compact, via-less configuration.

Main Results:

  • Achieved an insertion loss of approximately 1 dB across the operational bandwidth (9 GHz overlapping bandwidth from 13-22 GHz).
  • Demonstrated a return loss of 10 dB and isolation of approximately 20 dB.
  • The compact design measures 6.5 mm × 7.6 mm, offering a via-less solution.

Conclusions:

  • The proposed microstrip crossover offers effective performance with low insertion loss and high isolation.
  • The design enhances power transfer and port isolation in phased array antenna feed networks.
  • This contributes to increased sensitivity and accuracy in remote sensing systems.