Miniaturized 3-D cross-type receiver for wirelessly powered capsule endoscopy

Sadeque Reza Khan, Sumanth Kumar Pavuluri, Gerard Cummins, Marc P. Y. Desmulliez

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This paper presents the modeling, implementation, and testing of a cross-type receiver (RX) used for wireless power transfer (WPT) into an endoscopic capsule. A 3-D configuration for the receiver is proposed to increase the wireless link power transfer efficiency (WL-PTE) and enhance its robustness to angular variations of the capsule. The diameter and thickness of the flexible transmitter coils are 200 mm and 185 μm, respectively. The diameter of the miniaturized RX is 8 mm, which is appropriate for integration within current commercially available capsules. Experimental results demonstrate a WL-PTE of 1.3% and complete system efficiency of 0.9% inside a suitable tissue phantom of the relative permittivity of 300 at 5 MHz. A maximum variation of only 8.4% of the WL-PTE across 90° orientation of the RX was also measured. The minimum WL-PTE of 1% is the recorder for 7-cm translational displacement inside the phantom. A simulated specific absorption rate of 0.86 W/Kg was calculated, which is well below the limit allowed for medical applications. A maximum temperature variation of 2.2 °C was also measured for an operating duration of 10 h, which is typical of a capsule journey inside the gastrointestinal tract. The proposed system represents a viable proposition for WPT in capsule endoscopy.
Original languageEnglish
Article number8630861
Pages (from-to)1985-1993
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
Early online date31 Jan 2019
Publication statusPublished - May 2019


  • 3-D cross-type receiver
  • Capsule endoscopy (CE)
  • ferrite rod
  • power transfer efficiency (PTE)
  • specific absorption rate (SAR)
  • wireless power transmission

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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