A Strongly Miniaturized and Inherently Matched Folded Dipole Antenna for Narrowband Applications

A novel miniaturized printed folded dipole (FD) antenna has been designed for narrowband sensing applications. It is shown that the antenna may be systematically engineered to achieve matching to a practical source impedance at frequencies well below its half-wavelength resonance using series-<in...

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Bibliographic Details
Published inIEEE transactions on antennas and propagation Vol. 68; no. 5; pp. 3377 - 3386
Main Authors Das, Sanghamitro, Sawyer, David J., Diamanti, Nectaria, Annan, A. Peter, Iyer, Ashwin K.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.05.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Antennas
Dipole antennas
Folded dipole (FD) antenna
Impedance
Loaded antennas
Loading
Matching
Miniaturization
Narrowband
reactive loading
Resonant frequency
UHF antennas
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Summary:A novel miniaturized printed folded dipole (FD) antenna has been designed for narrowband sensing applications. It is shown that the antenna may be systematically engineered to achieve matching to a practical source impedance at frequencies well below its half-wavelength resonance using series-<inline-formula> <tex-math notation="LaTeX">LC </tex-math></inline-formula> loading and asymmetrical arm widths. This approach is used to design an inherently well-matched antenna that does not require an external matching network and demonstrates approximately 75% miniaturization, excellent co- to cross-polarization separation, over 24 dB higher realized gain, and strongly improved radiation efficiency relative to an unloaded FD of the same electrically small size. Experimental validation of a fabricated prototype demonstrates excellent agreement with simulations.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2963232