Radiation efficiency enhancement using lumped inductors for dual-mode mobile phone

Seung Jun Lee, Sung Won Park, Chul Woo Park, Young Sik Kim

Research output: Contribution to journalArticlepeer-review


This letter proposes a radiation efficiency enhancement technique using a lumped inductor for a dual-mode mobile phone.Two planar inverted-F antennas (PIFAs) with a collinear arrangement are used for dual-mode operation at the CDMA band of 824-894 MHz and GSM band of 880-960 MHz. Each antenna is separately connected to a lumped inductor of 4.7 nH. The electric field is more confined on each inverted-F section at its operating band in this configuration and the coupling between PIFAs is less than -10 dB. The simulated and measured results show that radiation efficiency of the proposed antenna is improved by up to 33%. The radiation patterns are similar to those of a dipole antenna with slightly tilted main beam directions due to the PIFA placement.

Original languageEnglish
Pages (from-to)1011-1013
Number of pages3
JournalMicrowave and Optical Technology Letters
Issue number4
Publication statusPublished - 2012 Apr


  • PIFA
  • coupling
  • dual-mode
  • mobile phone
  • radiation efficiency

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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