With the continuous advances in microwave technology, microwave components and related magnetic materials become more important in industrial environment. In order to further develop the microwave components, it is of interest to find new kinds of technologies and materials. Here, we introduce a new kind of material -- amorphous metallic wires which could be used in microwave components, and use these wires to design new kinds of attenuators. Based on the fundamental magnetic properties of amorphous wires and transmission line theory, we design a series of experiments focusing on these wires, and analyze all the experimental results. Experimental results show that incident and reflected signals produce interference and generate standing waves along the wire. At given frequency, the insertion attenuation S21 [dB] of an amorphous wire increases monotonically with dc bias current. The glass cover will influence the magnetic domain structure in amorphous metallic wires. Therefore, it will affect the circumference permeability and change the signal attenuation. It is necessary to achieve the impedance matching by coupling to an inductor and a capacitor in the circuit. The impedance matching makes the load impedance close to the characteristic impedance of transmission line. The magnetic wire-based attenuator designed in this thesis work are characterized and compared to conventional pin-diode attenuator.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:hh-13883 |
| Date | January 2010 |
| Creators | Sizhen, Lan, Lian, Shen |
| Publisher | Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE) |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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