Asymmetric ground rotman lens for multilayer packages

Jaeheung Kim, Woosung Lee, Young Joong Yoon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


An asymmetric ground Rotman lens is presented in this letter. A new design of a Rotman lens is proposed to accommodate a whole beamforming system by providing separate ground layers for antennas and circuits. The lens has three dielectric layers and four metallic layers. The prototype of the lens consists of seven array ports, five beam ports, and six dummy ports. The measured return losses show that all the beam ports are matched to better than 12 dB in the band of interest from 23 to 25 GHz. The radiation patterns were measured in a near field measurement system. It shows that the beam directions are-25 °,-13.6°, 0.2°, 12.4 °, and 24.5° , respectively and the beam widths are 14°, 13.8°, 13°, 13.4 °, and 14.1°, respectively. These results are in good agreement with the simulation. Thus, it is verified that the asymmetric ground lens is one of the best solutions for a compact beamforming system.

Original languageEnglish
Article number6750128
Pages (from-to)303-305
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number5
Publication statusPublished - 2014 May

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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