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A new directional coupler for UHF RFID reader
Author(s) -
Wei Feng,
Shi X. W.,
Huang Q. L.,
Chen D. Z.,
Wang X. H.
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23495
Subject(s) - hybrid coupler , ultra high frequency , power dividers and directional couplers , microstrip , stub (electronics) , microwave , magic tee , rat race coupler , electrical engineering , engineering , electronic engineering , acoustics , physics , telecommunications
A conventional microstrip directional coupler has poor isolation due to its unequal phase velocity between the even and odd modes. In this article, a compact dual‐stub microstrip directional coupler for the UHF RFID reader is proposed. The operating frequency band is 902–928 MHz. It is found that the coupler can obtain a good isolation of −65 dB at 920 MHz. Modeling and simulation results are also presented which are in good agreement with measurement data. © Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1973–1975, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23495