An asymmetrical cross-shaped microstrip resonator is proposed. It is analyzed on its characteristic impedance and resonant conditions. A first order triband bandstop filter (BSF) and a second order triband BSF are designed using this resonator. Both filters are simulated on Sonnet Suite software. Simulation results show that both filters generate three stopbands at 2.0, 3.0, and 4.5 GHz. The second order BSF is also fabricated and measured using a microwave network analyzer. Simulation and measurement results on the second order BSF agree well.
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