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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...
The reconfigurable RF module with Zero-IF structure has been developed at 698–802 MHz band in this paper, which has advantage of lower cost and ease to switch between different 15MHz signal channel. The varactor tunable microstrip band-pass filter, which is used to implement channel selection, performs excellent out-band rejection to all the interference existing in out band. The RF receiver has been...
In this paper, an ultra-wideband (UWB) bandpass filter with a frequency notch is designed and implemented. The proposed filter is based on coupled microstrip line with U-shaped defected ground structure (DGS). By introducing embedded open stubs (EOS) into input and output feed lines, the UWB bandpass filter can get a band-notched characteristic at the appointed frequency band. Several compensatory...
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