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In this paper, integration of bandstop filter with the flexible narrow bandwidth of bandpass filter with lambdag/2 open stubs by microstrip line on duroid substrate is presented. This kind of filter shows flexible bandwidth with variation of the position of the open stubs using the external quality factor, Qe without changing the impedance value at microwave range. On the other hand, by replacing...
In this paper, the substrate integrated waveguide (SIW) cavity resonator is proposed. The coupling between SIW cavity and microstrip line is achieved by the electric field at the vertical center plane along the propagation direction. Unlike the conventional cavity coupling structure that shows absorption characteristics at the resonant frequency, it can be easily integrated into planar form. The cavity...
In this paper, compact bandpass filters with λg/4 short stubs by microstrip line on duroid substrate are presented. This kind of filter shows flexible bandwidth with variation of the position of the short stub using the external quality factor, Qe without changing the impedance value at microwave. This filter provides compact design and sharp skirt characteristic by transmission-zero. The bandpass...
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