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The resonant performance of T-shaped microstrip resonators, a kind of stepped-impedance resonator (SIR), is computed and analyzed. Two novel SRI filters, a double-T-shaped bandstop filter and a double-H-shaped bandpass filter, are designed and their performances are calculated and optimized. The results show that the performance of the filters can be effectively improved by using defected ground structures (DGS), which suppress spurious responses by rejecting harmonics in the microwave circuits. The measured results are in good agreement with the simulated ones. The proposed filters have advantages such as a simple structure, wide bandwidth and high attenuation, and are quite useful in future applications in RF circuits.
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