A Novel Near-field Resonant Parasitic Electrically Small Antenna with A Wide Tuning Range

An electrically small antenna (ESA), designed on the near-field resonant parasitic (NFRP) technology and with a wide tuning range, is proposed. It utilizes a capacitively loaded loop (CLL) as its NFRP element, and tunes its resonant frequency by adjusting CLL's capacitance. Quite difference fro...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2024-02, Vol.23 (2), p.1-5
Main Authors: Chen, Jiahao, Zhou, Yijiang, Xue, Jingkai, Chen, Xing
Format: Article
Language:English
Subjects:
Antenna arrays
Current measurement
Driven elements (antennas)
Electrically small antennas (ESAs)
Frequency measurement
Frequency ranges
Impedance
Impedance matching
Near fields
near-field resonant parasitic (NFRP)
Parasitic elements (antennas)
Prototypes
Resonant frequencies
tunable antennas
Tuning
VHF antennas
Wideband
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Summary:An electrically small antenna (ESA), designed on the near-field resonant parasitic (NFRP) technology and with a wide tuning range, is proposed. It utilizes a capacitively loaded loop (CLL) as its NFRP element, and tunes its resonant frequency by adjusting CLL's capacitance. Quite difference from normal NFRP antennas using one ESA such as a semi-loop antenna (SLA) as the driven element, the proposed antenna employs a composite driven element (CDE), which combines a monopole and a SLA. Analyses reveal the CDE is able to realize good tuning impedance matching and effectively excite the CLL over a wide frequency range. A prototype is designed, fabricated and measured. Results show it achieves a 10-dB tuning bandwidth up to 107.9% (36-117 MHz) with a dimension of only 0.036\lambda \times 0.030\lambda \times 0.018\lambda ( ka =0.18), where \lambda is the wavelength corresponding to the start tuning frequency of 36 MHz.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2023.3332698