Wideband Transmitarray Antenna Using Compact 2-bit Filtering Unit Cells

Lehu Wen, Steven Gao, Qi Luo, Wei Hu, Benito Sanz-Izquierdo, Chao Wang, Xue-Xia Yang

Research output: Contribution to journalArticlepeer-review


A wideband transmitarray (TA) antenna using compact 2-bit filtering unit cells is presented with the center frequency designed at 10 GHz. The presented TA antenna features wide bandwidth with a compact aperture size, filtering radiation performance, and low cross-polarization levels. A novel compact 2-bit phasing scheme is first proposed and illustrated by utilizing the resonating characteristics of resonators. The charging and discharging principle of a resonator is utilized to realize a 180° phase shift, while J-invertor originating from the coupling between resonators is utilized to realize a 90° phase shift. Based on the proposed phasing scheme, novel 2-bit compact filtering unit cells are designed with a compact four-copper-layer configuration. Finally, a high-gain TA antenna was designed, fabricated, and measured for radiation performance verification. Due to the elaborately designed unit cells and the cutoff effect of the feed horn, a filtering radiation performance with flat in-band gain and high out-of-band suppressions is obtained. Measured results show that a flat 3-dB gain bandwidth of 21.3% is achieved with a thin thickness of 0.11λ0 . High suppressions of 34.3 and 30.1 dB are measured over the lower and upper out-of-bands. In addition, a low cross-polarization level of −38.5 dB is obtained for high-quality wireless communications.
Original languageEnglish
Pages (from-to)8344-8349
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number10
Publication statusPublished - 10 Jul 2023


  • Resonators
  • Filtering
  • Antenna arrays
  • Antenna feeds
  • Transmitting antennas
  • Couplings
  • Antenna measurements
  • Filtering unit cell
  • resonator
  • transmitarray (TA) antenna
  • wideband array antenna


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