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Active Core Saturation Prevention in...

Huey, Benjamin Edward.

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Active Core Saturation Prevention in Ferromagnetic Core Loop Antennas.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Active Core Saturation Prevention in Ferromagnetic Core Loop Antennas./
作者:	Huey, Benjamin Edward.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	218 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-07, Section: B.
Contained By:	Dissertations Abstracts International80-07B.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10979251
ISBN:	9780438807570

Active Core Saturation Prevention in Ferromagnetic Core Loop Antennas.
Huey, Benjamin Edward.

Active Core Saturation Prevention in Ferromagnetic Core Loop Antennas. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 218 p.

Source: Dissertations Abstracts International, Volume: 80-07, Section: B.

Thesis (Ph.D.)--Tennessee Technological University, 2018.

This item must not be sold to any third party vendors.

Ferromagnetic core loop antennas with high permeability core materials are typically used in size constrained applications requiring the detection and reception of weak Very Low Frequency (VLF) and Extremely Low Frequency (ELF) signals. However, these antennas have two limitations that constrain their performance in real world applications. First, the high permeability materials are susceptible to saturation in the presence of strong magnetic fields such as those generated by power lines, in research laboratories, or through natural phenomena. Second, the demagnetizing field inside the antenna core limits its effective permeability and prevents receiving the full benefit of the core material's soft ferromagnetic properties. Here, a novel system is presented that actively controls the magnetic flux in the core of the antenna by applying a control signal to an independent set of windings on the same core. This control signal is phase locked to the offending signal and the two signals destructively combine in the core. Also, new methods of optimizing core geometry are explored in an attempt to improve antenna performance. In total, eleven experimental core shapes were simulated using finite element analysis electromagnetic simulation software. These results expand the current body of knowledge on the relationship between core geometry and effective permeability beyond the tradition cylindrical and ellipsoidal geometries. The results show that it is possible to actively cancel the fundamental component of a strong interferer in the core of a high sensitivity ferromagnetic core loop antenna and prevent core saturation. This approach eliminates signal distortion caused by magnetic saturation that cannot be removed using traditional filtering or signal processing in the receiver. Thus, with this novel approach, high sensitivity ferromagnetic core antennas can now be used in applications where they were previously thought unsuitable. Furthermore, simulation and testing of antenna core prototypes have shown that modifications to the geometry of the antenna core's ends can improve effective permeability and result in better antenna performance.

ISBN: 9780438807570Subjects--Topical Terms:

649834
Electrical engineering.

Active Core Saturation Prevention in Ferromagnetic Core Loop Antennas.
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506 $a This item must not be sold to any third party vendors.
520 $a Ferromagnetic core loop antennas with high permeability core materials are typically used in size constrained applications requiring the detection and reception of weak Very Low Frequency (VLF) and Extremely Low Frequency (ELF) signals. However, these antennas have two limitations that constrain their performance in real world applications. First, the high permeability materials are susceptible to saturation in the presence of strong magnetic fields such as those generated by power lines, in research laboratories, or through natural phenomena. Second, the demagnetizing field inside the antenna core limits its effective permeability and prevents receiving the full benefit of the core material's soft ferromagnetic properties. Here, a novel system is presented that actively controls the magnetic flux in the core of the antenna by applying a control signal to an independent set of windings on the same core. This control signal is phase locked to the offending signal and the two signals destructively combine in the core. Also, new methods of optimizing core geometry are explored in an attempt to improve antenna performance. In total, eleven experimental core shapes were simulated using finite element analysis electromagnetic simulation software. These results expand the current body of knowledge on the relationship between core geometry and effective permeability beyond the tradition cylindrical and ellipsoidal geometries. The results show that it is possible to actively cancel the fundamental component of a strong interferer in the core of a high sensitivity ferromagnetic core loop antenna and prevent core saturation. This approach eliminates signal distortion caused by magnetic saturation that cannot be removed using traditional filtering or signal processing in the receiver. Thus, with this novel approach, high sensitivity ferromagnetic core antennas can now be used in applications where they were previously thought unsuitable. Furthermore, simulation and testing of antenna core prototypes have shown that modifications to the geometry of the antenna core's ends can improve effective permeability and result in better antenna performance.
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