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Updated: May 28, 2026

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Wideband Linearly Polarized Over-2-Bit Transmitarray Antenna for Millimeter-Wave Applications.

Yuanjun Shen1, Xuli Feng2, Tianling Zhang1

  • 1National Key Laboratory of Radar Detection and Sensing, Xidian University, Xi'an 710071, China.

Micromachines
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

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This study presents a wideband transmitarray antenna (TA) for millimeter-wave frequencies, achieving over 2-bit phase shift. The novel design demonstrates high gain and efficiency, suitable for advanced communication systems.

Area of Science:

  • Electromagnetics and Wave Propagation
  • Antenna Theory and Design
  • Millimeter-Wave Technology

Background:

  • Transmitarray antennas (TAs) are crucial for beamforming in modern wireless systems.
  • Achieving high phase resolution and wide bandwidth in TAs remains a significant challenge, especially in the millimeter-wave band.
  • Existing TA designs often struggle to meet the demands for precise phase control and broad operational frequencies.

Purpose of the Study:

  • To design and demonstrate a wideband, linearly polarized transmitarray antenna (TA) with over 2-bit phase resolution.
  • To utilize a novel receiving-transmitting (R-T) scheme for enhanced phase control in the millimeter-wave band.
  • To validate the performance of the proposed TA design through simulation and experimental measurements.

Main Methods:

Keywords:
linearly polarizedover-2-bittransmitarray antennawideband

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  • The TA unit cell comprises two rectangular patches connected by a metalized via, incorporating bent branches.
  • A 180° phase shift is achieved by rotating the receiving patch, while a continuous 90° phase shift is obtained by tuning connection points.
  • A 20x20 TA prototype was fabricated and measured to assess its electromagnetic performance.

Main Results:

  • The TA achieved an over-2-bit phase shift across the 18-30 GHz range.
  • Measured 1 dB and 3 dB gain bandwidths were 24.9% (24.47-31.43 GHz) and 46.96% (20.45-33 GHz), respectively.
  • Peak gain reached 25.17 dBi with a peak aperture efficiency of 55.2%, closely matching simulation results.

Conclusions:

  • The developed R-T scheme transmitarray antenna successfully provides wideband operation and high phase resolution in the millimeter-wave band.
  • The experimental results confirm the design's effectiveness and its potential for high-performance wireless applications.
  • This work contributes a robust design methodology for advanced millimeter-wave antenna systems.