Wideband Ka-band printed dipole array antenna with parasitic trapezoidal patch

Chung Yi Li, Yi Jyun Liao, Eric S. Li, Chao Hsiang Liao, Huayan Jin, Yi Da Chen, Kuo Sheng Chin*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review


This work presents a printed Ka-band dipole array antenna with wide bandwidth for millimeter-wave communication applications. The operating band of the proposed antenna ranges from 27.8–38.2 GHz exhibiting a wide bandwidth of 10.4 GHz. A balun structure is designed with interlaced U-shaped bending lines on the upper and lower metal layers to feed the dipole differentially. Parasitic trapezoidal patches are exquisitely placed adjacent to the driven dipoles for coupling, which can enhance bandwidth significantly through multiple resonances. The low-frequency radiation is mainly contributed by the resonance of the dipole, while the high-frequency radiation is affected by both the dipole and the parasitic trapezoidal patch. Due to the trapezoidal patch, the equivalent path length of the resonant current becomes shorter, thus supporting high-frequency resonance. A prototype of the proposed 1 × 2 dipole array antenna was fabricated for validation. The measured –10-dB impedance bandwidth is up to 27.8∼38.2 GHz (or 31.5%) and the realized gain is as high as 8 dBi, which is suitable for advanced millimeter-wave communication applications.

Original languageEnglish
Pages (from-to)538-555
Number of pages18
JournalJournal of Electromagnetic Waves and Applications
Issue number4
StatePublished - 2024

Bibliographical note

Publisher Copyright:
© 2024 Informa UK Limited, trading as Taylor & Francis Group.


  • dipole array
  • Index Terms: 5G antenna
  • Ka-band antenna
  • millimeter-wave antenna
  • parasitic trapezoidal patch
  • wideband antenna


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