東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

FindBook

Google Book

Amazon

博客來

Characterization and Applications of Micro- and Nano- Ferrites at Microwave and Millimeter Waves.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization and Applications of Micro- and Nano- Ferrites at Microwave and Millimeter Waves./
作者:	Chao, Liu.
面頁冊數:	1 online resource (145 pages)
附註:	Source: Dissertations Abstracts International, Volume: 77-08, Section: B.
Contained By:	Dissertations Abstracts International77-08B.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10013462click for full text (PQDT)
ISBN:	9781339480084

Characterization and Applications of Micro- and Nano- Ferrites at Microwave and Millimeter Waves.
Chao, Liu.

Characterization and Applications of Micro- and Nano- Ferrites at Microwave and Millimeter Waves. - 1 online resource (145 pages)

Source: Dissertations Abstracts International, Volume: 77-08, Section: B.

Thesis (Ph.D.)--Tufts University, 2015.

Includes bibliographical references

Ferrite materials are one of the most widely used magnetic materials in microwave and millimeter wave applications such as radar, wireless communication. They provide unique properties for microwave and millimeter wave devices especially non-reciprocal devices. Some ferrite materials with strong magnetocrystalline anisotropy fields can extend these applications to tens of GHz range while reducing the size, weight and cost. This thesis focuses on characterization of such ferrite materials as micro- and nano-powder and the fabrication of the devices. The ferrite materials with strong magnetocrystalline anisotropy field are metal/non-metal substituted iron oxides oriented in low crystal symmetry. The ferrite materials characterized in this thesis include M-type hexagonal ferrites such as barium ferrite (BaFe12O19), strontium ferrite (SrFe12O19), epsilon phase iron oxide (ϵ-Fe 2O3), substituted epsilon phase iron oxide (ϵ-Ga xFe2-xO3, ϵ-AlxFe2-xO 3). These ferrites exhibit great anisotropic magnetic fields. A transmission-reflection based in-waveguide technique that employs a vector network analyzer was used to determine the scattering parameters for each sample in the microwave bands (8.2-40 GHz). From the S-parameters, complex dielectric permittivity and complex magnetic permeability are evaluated by an improved algorithm. The millimeter wave measurement is based on a free space quasi-optical spectrometer. Initially precise transmittance spectra over a broad millimeter wave frequency range from 40 GHz to 120 GHz are acquired. Later the transmittance spectra are converted into complex permittivity and permeability spectra. These ferrite powder materials are further characterized by x-ray diffraction (XRD) to understand the crystalline structure relating to the strength and the shift of the ferromagnetic resonance affected by the particle size. A Y-junction circulator working in the 60 GHz frequency band is designed based on characterized M-type barium micro- and nano-ferrite. A new fabrication process using ferrite composite is proposed to integrate the Y-junction circulator into the semiconductor substrate. Theoretical design of a high gain Traveling Wave Tube (TWT) amplifier using a metamaterial (MTM) structure and cold-test of the MTM structure are also included in this dissertation. An SWS working around 6 GHz below the X-band waveguide TE10 cutoff frequency is fabricated.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781339480084Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

FerriteIndex Terms--Genre/Form:

542853
Electronic books.

Characterization and Applications of Micro- and Nano- Ferrites at Microwave and Millimeter Waves.
LDR:03930nmm a2200433K 4500 001 2360609
005 20231009073455.5
006 m o d
007 cr mn ---uuuuu
008 241011s2015 xx obm 000 0 eng d
020 $a 9781339480084
035 $a (MiAaPQ)AAI10013462
035 $a (MiAaPQ)tuftsase:11628
035 $a AAI10013462
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Chao, Liu. $3 3701231
245 1 0 $a Characterization and Applications of Micro- and Nano- Ferrites at Microwave and Millimeter Waves.
264 0 $c 2015
300 $a 1 online resource (145 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 77-08, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Afsar, Mohammed N.
502 $a Thesis (Ph.D.)--Tufts University, 2015.
504 $a Includes bibliographical references
520 $a Ferrite materials are one of the most widely used magnetic materials in microwave and millimeter wave applications such as radar, wireless communication. They provide unique properties for microwave and millimeter wave devices especially non-reciprocal devices. Some ferrite materials with strong magnetocrystalline anisotropy fields can extend these applications to tens of GHz range while reducing the size, weight and cost. This thesis focuses on characterization of such ferrite materials as micro- and nano-powder and the fabrication of the devices. The ferrite materials with strong magnetocrystalline anisotropy field are metal/non-metal substituted iron oxides oriented in low crystal symmetry. The ferrite materials characterized in this thesis include M-type hexagonal ferrites such as barium ferrite (BaFe12O19), strontium ferrite (SrFe12O19), epsilon phase iron oxide (ϵ-Fe 2O3), substituted epsilon phase iron oxide (ϵ-Ga xFe2-xO3, ϵ-AlxFe2-xO 3). These ferrites exhibit great anisotropic magnetic fields. A transmission-reflection based in-waveguide technique that employs a vector network analyzer was used to determine the scattering parameters for each sample in the microwave bands (8.2-40 GHz). From the S-parameters, complex dielectric permittivity and complex magnetic permeability are evaluated by an improved algorithm. The millimeter wave measurement is based on a free space quasi-optical spectrometer. Initially precise transmittance spectra over a broad millimeter wave frequency range from 40 GHz to 120 GHz are acquired. Later the transmittance spectra are converted into complex permittivity and permeability spectra. These ferrite powder materials are further characterized by x-ray diffraction (XRD) to understand the crystalline structure relating to the strength and the shift of the ferromagnetic resonance affected by the particle size. A Y-junction circulator working in the 60 GHz frequency band is designed based on characterized M-type barium micro- and nano-ferrite. A new fabrication process using ferrite composite is proposed to integrate the Y-junction circulator into the semiconductor substrate. Theoretical design of a high gain Traveling Wave Tube (TWT) amplifier using a metamaterial (MTM) structure and cold-test of the MTM structure are also included in this dissertation. An SWS working around 6 GHz below the X-band waveguide TE10 cutoff frequency is fabricated.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Electrical engineering. $3 649834
650 4 $a Electromagnetics. $3 3173223
650 4 $a Materials science. $3 543314
653 $a Ferrite
653 $a Magnetic devices
653 $a Microwave
653 $a Millimeter wave
653 $a Traveling wave tube
653 $a Vacuum electron devices
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0544
690 $a 0607
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Tufts University. $b Electrical Engineering. $3 1030762
773 0 $t Dissertations Abstracts International $g 77-08B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10013462 $z click for full text (PQDT)