Electrically small antennas with miniaturized impedance matching circuits for semiconductor amplifiers

Keiji Yoshida, Yukako Tsutsumi, Haruichi Kanaya

Research output: Contribution to journalArticle

9 Citations (Scopus)


In order to reduce the size of a wireless system, we propose a design theory for the broadband impedance matching circuit which connects an electrically small antenna (ESA) to a semiconductor amplifier. We confirmed its validity for the case of connection between a small slot loop antenna with a small radiation resistance of Ra= 0.776 Ω and a semiconductor amplifier with high input impedance of ZL = 321 - j871 Ω with the aid of the simulations by the electrical circuits using transmission lines as well as the electromagnetic field (EM field) simulator. We also made experiments on this antenna with matching circuits using high temperature superconductor YBCO thin films on MgO substrates.

Original languageEnglish
Pages (from-to)1368-1374
Number of pages7
JournalIEICE Transactions on Electronics
Issue number7
Publication statusPublished - Jul 2005


All Science Journal Classification (ASJC) codes

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

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