Hybrid HMSIW Cavities Antenna With a Half-Pentagon Ring Slot for Bandwidth Enhancement

Dian Widi Astuti, Yuyu Wahyu, Fitri Yuli Zulkifli, Eko Tjipto Rahardjo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A substrate-integrated waveguide (SIW) antenna is an implementation of a waveguide antenna in a microstrip antenna. The microstrip antenna, as a low-profile antenna, suffers from narrow impedance bandwidth. This paper proposes a novel bandwidth enhancement method for solving a narrow impedance bandwidth. Bandwidth enhancement was achieved by using quad-resonant frequencies. The quad-resonant frequencies are resulted from the hybrid half-mode substrate-integrated waveguide (HMSIW) cavities between the inner and outer cavities. The inner HMSIW cavity has a half-pentagon ring slot that disturbs the TE101-inner, TE102-inner, TE202-inner, and TE103-inner modes, whereas the outer HMSIW cavity consists of two outer quarter-mode substrate-integrated waveguide (QMSIW) cavities. The outer HMSIW cavity generated the TE102-outer and TE202-outer modes. The hybrid cavities were fed simultaneously using a port with a quarter-wavelength feed transmission line. The hybrid HMSIW cavities generated resonant frequencies that were close to each other. Additionally, this method was applied to the X-band frequency with a low-profile substrate. The simulated impedance bandwidth and peak realized gain was 33.86% (8.98-12.64 GHz) and 7.97 dBi, while the measured impedance bandwidth and peak gain were 31.83% (9.14 - 12.6 GHz) and 7.62 dBi, respectively. Strong agreement was observed between the measurement and simulation results.

Original languageEnglish
Pages (from-to)18417-18426
Number of pages10
JournalIEEE Access
Publication statusPublished - 2023


  • A half-pentagon ring slot
  • bandwidth enhancement
  • half-mode substrate-integrated waveguide antenna
  • hybrid cavities
  • quad-resonant


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