Miniature and reconfigurable CPW folded slot antennas employing liquid-metal capacitive loading

Alireza Pourghorban Saghati, Jaskirat Singh Batra, Jun Kameoka, Kamran Entesari

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


Microfluidic channels filled with liquid metal are used to realize miniature and reconfigurable CPW folded slot antennas. The method is based on employing the reactive loading effect of fluid metal bridges on top of the CPW slot antenna. As a result of this reactive loading, the frequency of the antenna reduces and the antenna is miniaturized by a factor of 85%. Also, by changing the configuration of filled and empty channels, each channel can be used as a switch. By using two pairs of microfluidic channels, three different frequency bands of 2.4, 3.5, and 5.8 GHz can be achieved. This translates to a switching ratio (fTR=f2/f1) of more than 2.5. The antenna is realized using common PCB techniques for the antenna circuit board and three-dimensional (3-D) printing technology for PDMS-based microfluidics structure. The antenna circuit board and the PDMS structure are bonded to each other using a very thin spin-coated PDMS layer. Design methodology, simulation, and measurement results of both antenna prototypes are presented. Both the miniature and reconfigurable antennas have similar radiation patterns to a normal CPW folded slot antenna and show low cross-polarization levels at all operating frequencies.

Original languageEnglish
Article number7128694
Pages (from-to)3798-3807
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number9
Publication statusPublished - 2015 Sept 1
Externally publishedYes


  • CPW folded slot antenna
  • Galinstan
  • requency reconfigurable antenna

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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