A frequency-reconfigurable slot loop antenna using ferroelectric MIM capacitors

Hsiao Yun Li, Shiu Cheng Chen, Hai Ping Chen, Wei Cheng Ran, Jia Shiang Fua

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A frequency-reconfigurable antenna based on periodically loading ferroelectric MIM capacitors along a slot loop is designed, fabricated, and measured. The antenna is fabricated on a 430-m-thick sapphire substrate with a total area of 1×1 cm2. The size of the slot loop is 2.5×2.5mm2. By changing the bias voltage of the ferroelectric varactors from 0V to 7V, the resonant frequency of the varactor-loaded antenna can be tuned from 5.57 GHz to 7.33 GHz, corresponding to a tuning range of 27.3%, while keeping the return loss greater than 10 dB. At 5.57 GHz, the size of the slot loop is 0.046×λ0.046 0 2. When biased at 7V, the antenna gain is 10.8 dBi at 7.35 GHz. Under 0-V bias, the Pin,1 dB of the tunable antenna is 18.8dBm at 5.6 GHz.

Original languageEnglish
JournalIEICE Electronics Express
Issue number16
StatePublished - 2013


  • Ferroelectric capacitors
  • Reconfigurable antennas
  • Slot loop antennas


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