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Abstract Step impedance coupled line band-pass filter is analyzed both theoretically and experimentally in this thesis. We use Odd/Even mode excitation method in the t- wo port network theory to find out the transfer function of our filter. Then, we use the method of amplitude approximation to derive the transfer function from our specification. After we get the two transfer functions from our filter stru- cture and specification, we can use the pole and zero synthesis method to obtain the ideal structure of our filter. Then, we put these structure into an EM soft ware to fine-tune the filter's size. The experiment is discussed in detail and is carefully calibrated by the TRL (Through-Reflection-Line) calibration method. We first employ microstrip line to implement our filter. We then use the LTCC (Low temperature co-fired ceramic) process to realize a multilayer ceramic filter. Good agreement between theory and experiment is obtained. Besides, we have successfully derived the equivalent circuit of our filter. We also have proved the validity of this equivalent circuit by the design example . Keyword:Step impedance coupled line band-pass filter, Odd/Even mode excitation method, amplitude approximation, Low temperature co-fired ceramic, multilayer ceramic filter.
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