A Multiport Chip-Scale Dielectric Resonator Antenna for CMOS THz Transmitters

Nadav Buadana, Samuel Jameson, Eran Socher

Research output: Contribution to journalArticlepeer-review


The practicality of terahertz (THz) CMOS radiating transmitters is limited by the power produced by CMOS circuits above the transistor fmax and the efficiency of on-chip antennas due to silicon substrate conductance and dimension sensitivity. In this article, we propose a new way of designing CMOS transmitters at THz frequencies by considering the silicon substrate as a dielectric resonator antenna. It is shown that sizing the substrate is the main contributor to determine the transmitter directivity and efficiency. We further propose a dense multiport approach to increase the radiated power from the silicon chip. To demonstrate the validity of this approach, a 1.45 × 1.45 mm2 65-nm CMOS chip was designed with a 5 × 6 dense array of excitation ports implemented using injection-locked third-harmonic voltage-controlled oscillators with digital control. The measured chip achieves a record radiated power of +9 dBm, an equivalent isotropic radiated power (EIRP) of +24 dBm, and the total power efficiency of 1.9% at 0.28 THz.

Original languageEnglish
Article number9108405
Pages (from-to)3621-3632
Number of pages12
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number9
StatePublished - Sep 2020


  • CMOS
  • dielectric resonator antenna
  • harmonic voltage-controlled oscillator (VCO)
  • millimeter wave (mm-Wave)
  • on-chip antenna
  • sub-terahertz (THz)
  • wireless injection locking


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