In-line Vector Modulator Integration in Dielectric-filled Waveguide

Jaakko Haarla, Juha Ala-Laurinaho, Markku Lahti, Mikko Varonen, Mikko Kantanen, Jan Holmberg, Ville Viikari

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This article proposes a scalable substrate-integrated waveguide (SIW) module accommodating an in-line vector modulator monolithic millimeter integrated circuit (MMIC). The SIW module is realized with low-temperature co-fired ceramic (LTCC) technology, and it can be inserted in a dielectric-filled waveguide (DFWG). The module combines $\lambda {g}/4$ -transformer-based $E$ plane tapering and SIWs on LTCC with the wire-bonded vector modulator. The proposed active LTCC module and two passive test structures (i.e., a constant-height-SIW module and a SIW module with $E$ plane taperings) are manufactured and tested as in-line modules in a DFWG. The passive test structures with the waveguide-to-DFWG and DFWG-to-SIW transitions measure 3.1 and 4.6 dB of insertion loss on average, respectively, at the 71-81 GHz frequency range. The active LTCC module measurements demonstrate a DFWG with phase and amplitude tuning capability and gain up to 17.6 dB within the same frequency range. A four-channel mock-up module with $\lambda {0}/2$ channel spacing is designed and manufactured to demonstrate the scalability of the design.

Original languageEnglish
Pages (from-to)153-160
Number of pages8
JournalIEEE Transactions on Components, Packaging and Manufacturing Technology
Issue number2
Early online date2023
Publication statusPublished - 1 Feb 2023
MoE publication typeA1 Journal article-refereed


  • Antenna components
  • Antenna feeds
  • Arrayed waveguide gratings
  • E-Band
  • Frequency measurement
  • Gain
  • Low-temperature co-fired ceramic (LTCC)
  • Modulation
  • Phased arrays
  • Prototypes
  • Substrate-integrated waveguide (SIW)
  • Waveguide component
  • Waveguide transitions
  • Wires


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