Analysis and Design of an UWB Band pass Filter with Improved Upper Stop band Performances (original) (raw)
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7th IEEE International Symposium on Microwave Antenna Propagation and EMC Technologise, 2017
A compact and high performance ultra-wideband (UWB) band-pass filter (BPF) based on two strength coupling quarter-wavelength coupled-lines, which were often served as feedlines between the port and resonator, has been designed and fabricated. Firstly, the desired high coupling factor is achieved by using three-line coupled structure and ground plane aperture technology. Then, the two transmission zeros are generated at the two sides of the wideband to improve the selectivity of this filter by the loading stepped-impedance resonator stubs(SIRs). Finally, the proposed filter is validated through both simulated and measured results and good agreement is obtained.
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In this paper, a microstrip lowpass filter with ultra-wide stopband and sharp rejection is presented. To achieve sharp frequency response and ultra-wide stopband, both closed loop stepped impedance (CLSI) and U-shape resonators are used. Accordingly the proposed filter with 3 dB Cutoff frequency at 3.63 GHz has been designed, fabricated and measured. The rejection band extended over-20dB from 3.95GHz to 40GHz. This stopband bandwidth is equal to 9.93 fc, moreover the size of the filter is 0.33λg×0.18 λg, which was: λg is the guided wavelength at the Cutoff frequency. The filter design based on scale factor of its component has been investigated to generalize its characteristics to the other practical Cutoff frequency. It was concluded that the measurement results are in good agreement with simulations.