A compact filter for ultra-wideband (UWB) applications is proposed and developed through quasi-equal allocation of the first three resonant frequencies of a stub-loaded resonator together with strong input/output excitation. Measured results show low insertion loss and flat group delay in the entire passband as well as a wide stopband. The size for this single-layer UWB filter without feeding lines is only 9.5×5 mm (0.53 λg ×0.28 λg in which λg is the guided wavelength of 50 Ω microstrip at the centre frequency).
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Han et al. (2009) studied this question.
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