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A dual‐port dual‐frequency coaxial dual‐helical antenna with high decoupling
Author(s) -
Zürcher J.F.
Publication year - 2005
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.20883
Subject(s) - decoupling (probability) , coaxial antenna , coaxial , antenna (radio) , port (circuit theory) , physics , electrical engineering , microwave , antenna measurement , engineering , electronic engineering , dipole antenna , telecommunications , control engineering
Abstract In order to obtain a circularly polarized and compact directive antenna for harmonic direction finding (HDF) of small animals using radio‐frequency identification (RFID), a dual‐port, dual‐frequency coaxial dual‐helical antenna is developed. The two frequencies are harmonics (2.45 and 4.9 GHz in our case). The antenna is realized using two coaxial, contradirective helices. Two different principles of realization are tested. The measured decoupling between ports is between 22 and 28 dB for the best antenna. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 1–4, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20883