Design of passive UHF RFID circulators/duplexers using directional couplers

Fanourios E. Fakoukakis; George A. Kyriacou; John N. Sahalos

doi:10.1109/RFID-TA.2012.6404563

Design of passive UHF RFID circulators/duplexers using directional couplers

Fanourios E. Fakoukakis, George A. Kyriacou, John N. Sahalos

Department of Engineering

Democritus University of Thrace

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The design of passive circulators/duplexers for RFID applications in the UHF band is presented. The design idea is based on the use of simple passive directional couplers, offering simplicity and low cost compared to ferrite devices or active architectures. The Tx/Rx isolation problem is solved exploiting a mismatched load, which creates a cancelling signal on the Rx port. Additional impedance matching is applied at the Tx port, in order to balance the effects of the mismatch load at the input (Tx). Both branch-line and ring couplers are alternatively used, designed mainly for unequal power division between output ports. A variety of design examples is presented, including miniaturized topologies, aiming at the reduction of size and cost. Design frequency is chosen at 900MHz, trying to cover both 860MHz and 910MHz bands.

Original language	English
Title of host publication	2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012
Pages	437-442
Number of pages	6
DOIs	https://doi.org/10.1109/RFID-TA.2012.6404563
Publication status	Published - 2012
Event	2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012 - Nice, France Duration: 5 Nov 2012 → 7 Nov 2012

Other

Other	2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012
Country/Territory	France
City	Nice
Period	5/11/12 → 7/11/12

Keywords

circulators
directional couplers
mismatch load
RFID

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10.1109/RFID-TA.2012.6404563

Cite this

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title = "Design of passive UHF RFID circulators/duplexers using directional couplers",

abstract = "The design of passive circulators/duplexers for RFID applications in the UHF band is presented. The design idea is based on the use of simple passive directional couplers, offering simplicity and low cost compared to ferrite devices or active architectures. The Tx/Rx isolation problem is solved exploiting a mismatched load, which creates a cancelling signal on the Rx port. Additional impedance matching is applied at the Tx port, in order to balance the effects of the mismatch load at the input (Tx). Both branch-line and ring couplers are alternatively used, designed mainly for unequal power division between output ports. A variety of design examples is presented, including miniaturized topologies, aiming at the reduction of size and cost. Design frequency is chosen at 900MHz, trying to cover both 860MHz and 910MHz bands.",

keywords = "circulators, directional couplers, mismatch load, RFID",

author = "Fakoukakis, {Fanourios E.} and Kyriacou, {George A.} and Sahalos, {John N.}",

year = "2012",

doi = "10.1109/RFID-TA.2012.6404563",

language = "English",

isbn = "9781467346566",

pages = "437--442",

booktitle = "2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012",

note = "2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012 ; Conference date: 05-11-2012 Through 07-11-2012",

}

Fakoukakis, FE, Kyriacou, GA & Sahalos, JN 2012, Design of passive UHF RFID circulators/duplexers using directional couplers. in 2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012., 6404563, pp. 437-442, 2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012, Nice, France, 5/11/12. https://doi.org/10.1109/RFID-TA.2012.6404563

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AU - Kyriacou, George A.

AU - Sahalos, John N.

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N2 - The design of passive circulators/duplexers for RFID applications in the UHF band is presented. The design idea is based on the use of simple passive directional couplers, offering simplicity and low cost compared to ferrite devices or active architectures. The Tx/Rx isolation problem is solved exploiting a mismatched load, which creates a cancelling signal on the Rx port. Additional impedance matching is applied at the Tx port, in order to balance the effects of the mismatch load at the input (Tx). Both branch-line and ring couplers are alternatively used, designed mainly for unequal power division between output ports. A variety of design examples is presented, including miniaturized topologies, aiming at the reduction of size and cost. Design frequency is chosen at 900MHz, trying to cover both 860MHz and 910MHz bands.

AB - The design of passive circulators/duplexers for RFID applications in the UHF band is presented. The design idea is based on the use of simple passive directional couplers, offering simplicity and low cost compared to ferrite devices or active architectures. The Tx/Rx isolation problem is solved exploiting a mismatched load, which creates a cancelling signal on the Rx port. Additional impedance matching is applied at the Tx port, in order to balance the effects of the mismatch load at the input (Tx). Both branch-line and ring couplers are alternatively used, designed mainly for unequal power division between output ports. A variety of design examples is presented, including miniaturized topologies, aiming at the reduction of size and cost. Design frequency is chosen at 900MHz, trying to cover both 860MHz and 910MHz bands.

KW - circulators

KW - directional couplers

KW - mismatch load

KW - RFID

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BT - 2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012

T2 - 2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012

Y2 - 5 November 2012 through 7 November 2012

ER -

Design of passive UHF RFID circulators/duplexers using directional couplers

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