A Wideband-to-Narrowband Tunable Antenna Using A Reconfigurable Filter

Pei Yuan Qin, Feng Wei, Y. Jay Guo

Research output: Contribution to journalArticlepeer-review

103 Citations (Scopus)


A novel microstrip circular disc monopole antenna with a reconfigurable 10-dB impedance bandwidth is proposed in this communication for cognitive radios (CRs). The antenna is fed by a microstrip line integrated with a bandpass filter based on a three-line coupled resonator (TLCR). The reconfiguration of the filter enables the monopole antenna to operate at either a wideband state or a narrowband state by using a PIN diode. For the narrowband state, two varactor diodes are employed to change the antenna operating frequency from 3.9 to 4.82 GHz continuously, which is different from previous work using PIN diodes to realize a discrete tuning. Similar radiation patterns with low cross-polarization levels are achieved for the two operating states. Measured results on tuning range, radiation patterns, and realized gains are provided, which show good agreement with numerical simulations.

Original languageEnglish
Article number7038150
Pages (from-to)2282-2285
Number of pages4
JournalIEEE Transactions on Antennas and Propagation
Issue number5
Publication statusPublished - 1 May 2015
Externally publishedYes


  • cognitive radio
  • monopole antenna
  • Reconfigurable antenna
  • wideband antenna


Dive into the research topics of 'A Wideband-to-Narrowband Tunable Antenna Using A Reconfigurable Filter'. Together they form a unique fingerprint.

Cite this