Abstract
Recently,due to the improvements of solid microwave devices and semiconductor technology,many applications have been realized in cars,airplanes,cellphones,fire alarms,wireless communication systems, Global Positioning System(GPS),etc.All of these applications above could be made by microwave devices.And microstrip line is the hottest one of the planar transmission lines because of its simple fabrication and excellent integration with other active or passive microwave devices. While using microstrip lines to transmit microwave signals, the structure of microstrip lines,the characteristics and materials of coating films should all be taken into considerations,because all of them will lead to the attenuations of transmission signals,and then will affect the amplitudes of the receiving signals. In our experiments,we use the T-type structure of microstrip lines for its good resonance spectra.All of our samples were fabricated by two processes individually called thermal evaporation and DC sputtering. The following process is the measurement.Under the microwave frequency,we measure the Q-factors and resonance frequencies by vector network analyzer(VNA).And under DC circumstance,we measure the R-T curves of coating films by four point test.Our goal is to know the frequency response and temperature response for different kinds of metals under microwave frequency and DC circumstances.