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This paper proposes a novel narrow-band bandpass filter with relative 3dB bandwidth of less than 1% and enhanced selectivity by utilizing negative resistance. The HEMT device is employed to realize the negative resistance with a common-source and drain inductance and capacitance feedback structure. Q-enhancement is accomplished by the negative resistance coupled to other resonators. The measured results...
This paper presents a novel wideband bandpass filter with wide stop-band. The filter is realized by using two transformations of coupled microstrip line and four dumbbellshaped defected ground structures. The stub loaded coupled microstrip line with two dumbbell-shaped defected ground structures is used to generate wide pass-band, and the endconnected coupled microstrip line with dumbbell-shaped defected...
A novel directional filter based on half-mode substrate integrated waveguide (HMSIW) technology is presented in this paper. The directional filter consists of two identical HMSIW bandpass filters (BPFs) and two identical 3-dB couplers. The HMSIW BPFs were realized by etching complementary split ring resonators (CSRRs) on the top plane of HMSIW. The proposed directional filter was designed, fabricated...
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