This paper presents an alterative implementation of a shunt open-circuited stub formultilayer microwave circuit.With making use\r\nof the proposed implementation, a simple and compact bandstop filter with a district bandstop characteristics and a first spurious\r\nat the third harmonic is proposed. The proposed filter exhibits about 12.5% fractional bandwidth of -10 dB signal rejection at\r\nthe center frequency of 2.04 GHz and flat group delay at the pass bands. Besides, by cascading a number of the proposed bandstop\r\nfilters designed at the different frequencies, multiband bandstop filters can be easily realized. A dual- (tri-) band design at the\r\ncenter frequencies of 2 GHz and 3 GHz (and 4 GHz) is designed, realized, and measured. The proposed bandstop filter well suits\r\nthe nowadays multilayer and compact radio frequency integrated circuit design.
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