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Broadband electrically small antenna using two electromagnetically coupled radiators
Author(s) -
Cho Chihyun,
Park Ikmo,
Choo Hosung
Publication year - 2010
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.25164
Subject(s) - monopole antenna , antenna efficiency , helical antenna , random wire antenna , radiation pattern , physics , microwave , dipole antenna , broadband , optics , coaxial antenna , bandwidth (computing) , acoustics , antenna measurement , antenna (radio) , electrical engineering , engineering , telecommunications , quantum mechanics
We propose an electrically small antenna that achieves broad bandwidth with small antenna size. This antenna is composed of a hemispherical disk‐loaded monopole and a hemispherically wound helix to maximize the disk loading effect and the electromagnetic coupling between the two radiating elements in a given space. The fabricated antenna is 10.7 cm in size ( kr = 0.449) and exhibits a measured −3 dB bandwidth of about 30% for a center frequency of 200 MHz. The antenna also achieves a radiation efficiency of over 85% and a transmission loss similar to that of a conventional λ/4 monopole, despite the fact that size of the antenna is about 30% that of the λ/4 monopole. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1369–1372, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25164