A quarter-wavelength shorted microstrip antenna with a slot for dual-frequency operation

Takashi Amanq, Norimichi Chiba, Hisao Iwasaki

Research output: Contribution to journalArticle

4 Citations (Scopus)


A novel dual-band internal antenna similar in size to the single-band internal antenna for cellular handsets is proposed. Our approach to realize a small and low-profile dual-band internal antenna is to use the dominant mode (TM10 mode) and the higher-order mode (TM30 mode). In order to use this approach for recent dual-band cellular systems it is necessary to lower the resonant frequency of the higher-order mode (TMao mode). This motivated our development of a new antenna configuration with a slot on the radiation element of a quarter-wavelength shorted microstrip antenna to lower the resonant frequency of the TM30 mode. In this paper, the experimental and the analytical results for this antenna are presented. In the results, by adjusting the location and the length of the slot, the dual-frequency operation can be achieved with the frequency ratio (TM30 modc/TM10 mode) from 2 to 3. In addition, the enhancement of bandwidth is presented.

Original languageEnglish
Pages (from-to)1211-1215
Number of pages5
JournalIEICE Transactions on Electronics
Issue number7
Publication statusPublished - 1999 Jan 1



  • Dual-band
  • Dual-frequency
  • Microstrip antenna
  • Slot

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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