| With the development of the communication industry,UWB has become the focus of future communication industry,Ultra-wideband bandpass filter as an important component of ultra-wideband systems also causes a wide range of concerns.There are many narrowband communication signals in the UWB frequency range that can affect the performance of UWB systems.Therefore,UWB band-pass filter with notch becomes a research hotspot.The main contents of this paper are as follows:1.A UWB bandpass filter based on E-type resonator is designed.The filter has the advantages of miniaturization and easy processing.A method of realizing tight coupling between two resonators with capacitive coupling is proposed to solve the actual processing problems and broaden the application frequency band.The C-type defected ground structure(DGS)is used to obtain its high-frequency harmonic suppression and optimization of filter performance.Then a purely reactance element is used to introduce a frequency-adjustable notch based on the theory of series resonance.2.A UWB bandpass filter based on half-ladder ladder impedance loading resonator is designed.The passband has five transmission poles,therefor the UWB bandpass filter possesses good flatness.And the filter is compact and easy to fabrication.Then,on the basis of the above,tke flexible use of embedded branch structure and asymmetric input-output structure introduces notch.Two UWB bandpass filters are designed:a dual-notch(5.8GHz/8GHz)UWB bandpass filter and a PIN-based electronically switched notch UWB band-pass filter.3.A kind of UWB bandpass filter with notch in the center of band is designed.And the filter is applied to the interference detection subsystem of an adaptive antenna.The scheme design and the index decomposition of the subsystem are carried out,then the main components are studied and the simulation performance can meet the index requirements of each module.The whole subsystem is set up to achieve the function of interference detection. |
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