الفهرس 
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Abstract
In this thesis the analysis and design, of the parallel-coupled line bandpass filters (PCL-BPF) is presented. The filter is realized using the broadside-coupled microstrip line structure with two different layout implementations. The first layout is the PCL-BPF with open-end resonator sections, while the second layout is the PCL-BPF with gaps between the resonator sections. The spectral domain approach (SDA) is used for the analysis of the broadside-coupled microstrip lines to obtain the characteristic impedances and the dielectric constants of the propagation modes. Also the algorithm of the SDA is tested by applying it to the analysis of the coupled suspended microstrip line with tuning septums on the lower side of the suspended dielectric layer. By the analysis of the broadside-coupled microstrip lines structure the relation between the PCL-BPF structure parameters and the characteristic impedances is obtained. Finally, Comparison between the two filter layouts for different fractional bandwidths will be presented, and the effect of the variation of the filter structure parameters on the filter response is studied.