Abstract
In this paper, design, fabrication and experimental results of a dual-band bandpass filter for global system for mobile communications (GSM) in center frequency $$ f_{1} = 1.84\,GHz $$ and worldwide interoperability for microwave access (WiMAX) in center frequency $$ f_{2} = 3.5\,GHz $$ are presented. This dual-band filter is harmonically designed and used in a 10-W power amplifier. Also, the filter is required to suppress the second harmonic of the GSM standard because the associated frequency (3.68 GHz) is too close to the center frequency of WiMAX. The configuration of proposed dual-band bandpass filter comprises of a dual quad-section stepped impedance resonators with a J-inverter in between. This combination of resonators eliminate other interfering frequencies such as, the second and third harmonics. The lumped equivalent model of proposed dual-band bandpass filter is also presented and analyzed. A dual-band bandpass filter was implemented with good compactness and low insertion loss. A good agreement is obtained between the simulation and measurement results.
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