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The circulator Used BaFe_ (12) O_ (19) thick film preparation and application of

Author: HeYun
Tutor: JiangHongChuan
School: University of Electronic Science and Technology
Course: Materials Physics and Chemistry
Keywords: Barium ferrite thick film Junction circulator Screen printing HFSS
CLC: O614.233
Type: Master's thesis
Year: 2009
Downloads: 56
Quote: 0
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Abstract


Self- bias of barium ferrite microstrip junction circulator has the advantages of small size , light weight , has a broad application prospects in the field of microwave communication device , to achieve microstrip the junction circulator microwave circuit integration need film or thick ferrites of the form of a film instead of the ferrite block . In this paper, the method of screen printing preparation Microwave barium ferrite thick film process conditions such as sintering temperature , sintering time , the sintering pressure as well as the orientation of the magnetic field on the structure and magnetic properties of barium ferrite thick film micro energy impact . On this basis , the HFSS simulation software design barium ferrite thick film circulator and microstrip barium ferrite thick film junction circulator prototype devices fabricated using a photolithographic process . Experimental results show that as the sintering temperature increases , the thick film will appear in the small amount of Fe 2 < / sub> O 3 phase, the remanence ratio of the thick film as the temperature increase reduced , and the coercive force is further reduced when the sintering temperature is 1110 ℃ first gradually increases as the temperature rises , the remanence ratio is 0.58, and the coercive force of 5313Oe . Remanence ratio gradually increased with increasing sintering time , the coercivity first decreases and then increases with increasing sintering time . The pressure sintering can be a significant improvement in the density of the thick film and grain uniformity . Sintering pressure of 6 MPa, a temperature of 1110 ° C , and the time for 10h, plus oriented magnetic field , the remanence and coercive force , respectively 0.66 and 5394Oe . Oriented magnetic field can significantly improve the remanence ratio of a thick film , with the oriented magnetic field increases , the thick film crystal grains having the C axis preferred orientation , and remanence ratio and coercive force with the increase of the oriented magnetic field and increase, when the oriented magnetic field 9000Oe, a temperature of 1110 ° C , the sintering time is 10h , a sintering pressure of 2MPa when its maximum remanence ratio and coercive force were 0.78 and 5129Oe . HFSS simulation software design and simulation, the the ring optimized structure parameters as follows : The radius of the disc of the conduction band of 0.97mm, the length of the tape guide wire is 2.3mm, and the width of 0.6mm . The test results show that the circulator prototype devices produced in the test frequency is 27GHz about the insertion loss S21 is about 8.5dB , and its isolation S12 is approximately 12.5dB , a difference of about 4dB , initially shown the effect of the ring .

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > Alkaline earth metal (Ⅱ A group metal elements) > Ba Ba
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