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This letter presents one absorptive bandstop waveguide filter utilizing two couplers. The proposed absorptive bandstop filer (ABSF) with four ports is achieved by combing two quadrature couplers with two conventional waveguide bandstop filters, unwanted energy within the stopband will be absorbed by absorptive port instead of reflecting to incident port. The theory is analyzed and a waveguide bandstop...
A novel hybrid bandpass filter based on coaxial resonator and evanescent mode waveguide(EMW) with loaded posts is presented. The coaxial resonators are directly coupled to the EMW with posts through air windows. The fundamental TEM mode of the coaxial resonator and the evanescent mode of the EMW constructing the passband of the filter, while the staggered spurious modes of the coaxial rsonator and...
A novel absorptive bandstop microstrip filter utilizing two couplers is presented in this letter. The proposed absorptive bandstop filer (ABSF) with four ports is achieved by combing two quadrature couplers with two conventional microstrip bandstop filters. Unwanted energy within the stopband will be absorbed by absorptive port instead of reflecting to incident port so that the property of absorption...
This paper presents a stripline SIR bandpass filter with high skirt selectivity. The bandpass filter has a good performance on the out-of-band rejection by adding some through metallized holes on both sides of the substrate. It is easy to integrate by using a structure of transition between microstrip to stripline. To validate the proposed concept, a filter working at 12.5GHz with 5% fractional bandwidth...
A stripline diplexer with both stopband and isolation performances enhanced by metalized holes is presented in this letter. Two stripline filters are designed using folded stepped-impedance resonators (SIRs), and then a T junction is used to combine the two designed stripline filters so that a diplexer is constructed. A stripline to microstrip line transition is studied and used to guide signals from...
A microstrip bandpass filter with extended stopband is presented in this paper. The extended stopband is obtained through using lowpass filter section in the filter design. The lowpass filter section is composed of SIR resonators with appropriate positions. Equivalent lumped circuit of the lowpass section is given to better understand performance of the proposed filter. This lowpass Alter section...
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