Non-foster impedance matching sensitivity of electrically small electric and magnetic spherical dipole antennas

Ick-Jae Yoon, S. Christensen, Vitaliy Zhurbenko, Oleksiy S. Kim, Olav Breinbjerg

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The impedance bandwidth (BW) improvement property of a self-resonant folded spherical helix electric dipole and a spherical split ring (SSR) magnetic dipole is compared when a negative reactance element is loaded on the parasitic resonator of the antennas. They have the same electrical size of ka = 0.38 and both approach each lower Q-bound. It is found that the impedance characteristic reacts more sensitively to the loaded element for the SSR antenna due to the inherent two-times higher Q of the magnetic antenna. It is also found that a conventional non-Foster circuit composed of a series negative inductor and a capacitor cannot be used for wide impedance matching of the SSR antenna due to the high sensitivity. Subsequently, a circuit topology that enables more precise matching of the reactive values for widened impedance matching in the high-Q SSR antenna and satisfies the stable operating condition is proposed. It is observed that the improvement ratio of the BW is limited in practical situation. Nevertheless, the measured reflection coefficient of the 3D-printed SSR antenna loaded with the designed active matching circuit shows two-times wider impedance BW than passive matching, verifying the simulated result from the circuit and electromagnetic (EM) simulations.
Original languageEnglish
JournalElectronics Letters
Volume52
Issue number12
Pages (from-to)996-998
ISSN0013-5194
DOIs
Publication statusPublished - 2016

Keywords

  • Electrical and Electronic Engineering
  • 3D printers
  • Antennas
  • Electric impedance
  • Impedance matching (electric)
  • Magnetism
  • Microstrip antennas
  • Reconfigurable hardware
  • Spheres
  • Electromagnetic simulation
  • Impedance bandwidths
  • Impedance characteristics
  • Magnetic antennas
  • non-Foster circuits
  • Operating condition
  • Simulated results
  • Spherical dipole antennas
  • Dipole antennas

Cite this

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title = "Non-foster impedance matching sensitivity of electrically small electric and magnetic spherical dipole antennas",
abstract = "The impedance bandwidth (BW) improvement property of a self-resonant folded spherical helix electric dipole and a spherical split ring (SSR) magnetic dipole is compared when a negative reactance element is loaded on the parasitic resonator of the antennas. They have the same electrical size of ka = 0.38 and both approach each lower Q-bound. It is found that the impedance characteristic reacts more sensitively to the loaded element for the SSR antenna due to the inherent two-times higher Q of the magnetic antenna. It is also found that a conventional non-Foster circuit composed of a series negative inductor and a capacitor cannot be used for wide impedance matching of the SSR antenna due to the high sensitivity. Subsequently, a circuit topology that enables more precise matching of the reactive values for widened impedance matching in the high-Q SSR antenna and satisfies the stable operating condition is proposed. It is observed that the improvement ratio of the BW is limited in practical situation. Nevertheless, the measured reflection coefficient of the 3D-printed SSR antenna loaded with the designed active matching circuit shows two-times wider impedance BW than passive matching, verifying the simulated result from the circuit and electromagnetic (EM) simulations.",
keywords = "Electrical and Electronic Engineering, 3D printers, Antennas, Electric impedance, Impedance matching (electric), Magnetism, Microstrip antennas, Reconfigurable hardware, Spheres, Electromagnetic simulation, Impedance bandwidths, Impedance characteristics, Magnetic antennas, non-Foster circuits, Operating condition, Simulated results, Spherical dipole antennas, Dipole antennas",
author = "Ick-Jae Yoon and S. Christensen and Vitaliy Zhurbenko and Kim, {Oleksiy S.} and Olav Breinbjerg",
year = "2016",
doi = "10.1049/el.2016.0676",
language = "English",
volume = "52",
pages = "996--998",
journal = "Electronics Letters",
issn = "0013-5194",
publisher = "The/Institution of Engineering and Technology",
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}

Non-foster impedance matching sensitivity of electrically small electric and magnetic spherical dipole antennas. / Yoon, Ick-Jae; Christensen, S.; Zhurbenko, Vitaliy; Kim, Oleksiy S.; Breinbjerg, Olav.

In: Electronics Letters, Vol. 52, No. 12, 2016, p. 996-998.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Non-foster impedance matching sensitivity of electrically small electric and magnetic spherical dipole antennas

AU - Yoon, Ick-Jae

AU - Christensen, S.

AU - Zhurbenko, Vitaliy

AU - Kim, Oleksiy S.

AU - Breinbjerg, Olav

PY - 2016

Y1 - 2016

N2 - The impedance bandwidth (BW) improvement property of a self-resonant folded spherical helix electric dipole and a spherical split ring (SSR) magnetic dipole is compared when a negative reactance element is loaded on the parasitic resonator of the antennas. They have the same electrical size of ka = 0.38 and both approach each lower Q-bound. It is found that the impedance characteristic reacts more sensitively to the loaded element for the SSR antenna due to the inherent two-times higher Q of the magnetic antenna. It is also found that a conventional non-Foster circuit composed of a series negative inductor and a capacitor cannot be used for wide impedance matching of the SSR antenna due to the high sensitivity. Subsequently, a circuit topology that enables more precise matching of the reactive values for widened impedance matching in the high-Q SSR antenna and satisfies the stable operating condition is proposed. It is observed that the improvement ratio of the BW is limited in practical situation. Nevertheless, the measured reflection coefficient of the 3D-printed SSR antenna loaded with the designed active matching circuit shows two-times wider impedance BW than passive matching, verifying the simulated result from the circuit and electromagnetic (EM) simulations.

AB - The impedance bandwidth (BW) improvement property of a self-resonant folded spherical helix electric dipole and a spherical split ring (SSR) magnetic dipole is compared when a negative reactance element is loaded on the parasitic resonator of the antennas. They have the same electrical size of ka = 0.38 and both approach each lower Q-bound. It is found that the impedance characteristic reacts more sensitively to the loaded element for the SSR antenna due to the inherent two-times higher Q of the magnetic antenna. It is also found that a conventional non-Foster circuit composed of a series negative inductor and a capacitor cannot be used for wide impedance matching of the SSR antenna due to the high sensitivity. Subsequently, a circuit topology that enables more precise matching of the reactive values for widened impedance matching in the high-Q SSR antenna and satisfies the stable operating condition is proposed. It is observed that the improvement ratio of the BW is limited in practical situation. Nevertheless, the measured reflection coefficient of the 3D-printed SSR antenna loaded with the designed active matching circuit shows two-times wider impedance BW than passive matching, verifying the simulated result from the circuit and electromagnetic (EM) simulations.

KW - Electrical and Electronic Engineering

KW - 3D printers

KW - Antennas

KW - Electric impedance

KW - Impedance matching (electric)

KW - Magnetism

KW - Microstrip antennas

KW - Reconfigurable hardware

KW - Spheres

KW - Electromagnetic simulation

KW - Impedance bandwidths

KW - Impedance characteristics

KW - Magnetic antennas

KW - non-Foster circuits

KW - Operating condition

KW - Simulated results

KW - Spherical dipole antennas

KW - Dipole antennas

U2 - 10.1049/el.2016.0676

DO - 10.1049/el.2016.0676

M3 - Journal article

VL - 52

SP - 996

EP - 998

JO - Electronics Letters

JF - Electronics Letters

SN - 0013-5194

IS - 12

ER -