Frequency agility of broadband antennas integrated with a reconfigurable RF impedance tuner

Zhen Zhou, Kathleen L Melde

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

This letter demonstrates the frequency agility that can be achieved when a broadband antenna is integrated with a reconfigurable RF tuner as an impedance matching circuit. The reconfigurable tuner uses a microstrip loaded line structure with four stubs that are each terminated by a varactor diode. The spectral response can be varied by changing the capacitance of the diodes. Input impedance data obtained from measurements on commercially available antennas were used in an Agilent Advanced Design System (ADS) model of the four-stub tuner. The results show that adding the reconfigurable tuner can facilitate excellent frequency agility of the return loss of the broadband antenna over several narrow frequency sub bands.

Original languageEnglish (US)
Pages (from-to)56-59
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Volume6
DOIs
StatePublished - 2007

Fingerprint

Frequency agility
Antennas
Diodes
Varactors
Microstrip lines
Capacitance
Networks (circuits)

Keywords

  • Frequency agile antennas
  • Intelligent RF front ends
  • Reconfigurable tuner

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

Cite this

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AB - This letter demonstrates the frequency agility that can be achieved when a broadband antenna is integrated with a reconfigurable RF tuner as an impedance matching circuit. The reconfigurable tuner uses a microstrip loaded line structure with four stubs that are each terminated by a varactor diode. The spectral response can be varied by changing the capacitance of the diodes. Input impedance data obtained from measurements on commercially available antennas were used in an Agilent Advanced Design System (ADS) model of the four-stub tuner. The results show that adding the reconfigurable tuner can facilitate excellent frequency agility of the return loss of the broadband antenna over several narrow frequency sub bands.

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