RF-IPD directional coupler for mobile RFID handset applications

RF-IPD directional coupler for mobile RFID handset applications

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
Electronics Letters — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

To offer RFID services on mobile phones, the RFID reader must be embedded on the handset as a chip. However, the directional coupler, a ceramic passive component used in conventional RFID readers with identical Tx/Rx carrier frequency, has been too large for cellular handset applications. A miniaturised directional coupler design for UHF RFID mobile readers using an IPD (integrated passive device) process is presented. Parallel-coupled line theory has been used for formulation of a T-type and a π-type coupler. Couplers with dimensions of 1.74×1.6 mm and 1.32×1.4 mm were assembled using the IPD process.


    1. 1)
      • B.J. Chang , Y.D. Lee . Mobile RFID technical trends and major issues. IITA Weekly Tech. Trends , 31 - 40
    2. 2)
      • J.E. Jang , H. Lee . A 900-MHz direct-conversion transceiver for mobile RFID systems, IEEE RFIC Symp..
    3. 3)
      • T.Y. Song , J.H. Kim , S.H. Kim , J.S. Park , J.B. Lim . Design of a novel lumped element backward directional coupler based on parallel coupled-line theory. IEEE MTT-S Int. Microw. Symp. Dig. , 213 - 216
    4. 4)
      • R. Mongia , I. Bahel , P. Bhartia . (1999) RF and microwave coupled line circuits.
    5. 5)
      • Y.C. Chiang , C.Y. Chen . Design of lumped-element quadrature coupler. Electron Lett. , 465 - 466
    6. 6)

Related content

An Erratum has been published for this content:
Erratum for ‘RF-IPD directional coupler for mobile RFID handset applications’
This is a required field
Please enter a valid email address