12991

11874

كارشناسي ارشد

مخابرات (ميدان و موج)

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

۱۳۹۶

[هفت]، ۱۳۲ص.: مصور، جدول، نمودار

محسن مداح علي

ابوالقاسم زيدآبادي نژاد، ذاكر حسين فيروزه

1396/08/16

كتابنامه

برق و كامپيوتر

مهندسي برق و كامپيوتر

ID11874

Analysis and Design of Magnetic Material Devices in Millimeter Wave Band Sayed Mohammad Reza Ataei Mohammadreza ataei@ec iut ac ir Date of Submission 2017 09 20 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Dr Mohsen Maddahali maddahali@cc iut ac irAbstractFerrites are a series of magnetic crystals with permeability tensor controlled by applied magnetic field Thecontrollability and nonreciprocity of the ferrites in interaction with electromagnetic signals has led to widespread usingin transmitters and receivers of telecommunications and military applications The most important of these devicesare circulators phase shifters isolators filters and limiters It is also used in telecommunication systems with acapacity of several milliwatts to several megawatts which caused them to be used in a wide range of electromagneticsignals Hence the design of magnetic devices with small dimensional low insertion loss and high return loss are veryfavorable at high frequencies The need to increase bandwidth and sending lots of data in wireless communicationsystems is one of the most important factors in the emergence of higher frequencies and millimeter waves Thesedemands have led to the appearance of a family of hexaferrites and Ferromagnetic Nanowires Also the desire to sendhigh power signals in communication systems has led to widespread use of high power magnetic devices in amillimeter wave bands Accordingly the design and simulation of magnetic devices with commercial software whosescattering parameters are well matched to the measurement values are important issues in their economicManufacturing technology Most magnetic devices act in the partial magnetization state For example due to the smallgeometric dimensions of the circulators in the millimeter wave bands self biased magnetic structures are desirable which are permanent magnet As a result their permeability tensor modeling is a major challenge in their suitabledesign In the design of high power magnetic devices the nonlinear mechanisms which increase the loss of devices must be considered In this thesis by using a precision modeling of hexaferrite tensors as well as ferromagneticnanowires we design analyze and simulation more accuracy some of the three port y type waveguide circulators athigh frequencies Also the mechanism of stimulation of spin wave and control of them is investigated in a high powerphase shifter and the power of signal transmitted with this device is calculated Ultimately the scattering parametersof phase shifter will be simulated KeywordsMillimeter waves Magnetic devices Partial magnetized state of ferrites Hexaferrites Ferromagnetic Nanowires High power ferrite devices Permeability tensor modeling

محسن مداح علي

ابوالقاسم زيدآبادي نژاد، ذاكر حسين فيروزه