Simulation design of four-mode dual-band HMSIW bandpass filter based on EBG
In order to solve the problem of tight spectrum resources,a four-mode dual-frequency half-mode substrate integrated waveguide(HMSIW)bandpass filter based on electromagnetic bandgap structure(EBG)is proposed.The filter consists of an HMSIW cavity,EBG structure,and four perturbated metallized vias.The EBG structure is etched onto the top metal layer of the HMSIW cavity to change the modal distribution within the cavity,with the resonant frequencies of the TE101 and TE102 modes forming the first passband and the resonant frequencies of the TE201 and TE202 modes forming the second passband.Based on the above analysis,a four-mode dual-band band-pass filter with a center frequency of 5.21 GHz and 7.58 GHz was designed,manufactured and measured,with a relative bandwidth of 9%and 8%,a minimum insertion loss of 0.57 dB and 0.95 dB in the low band and a high frequency band,and a loss of-16 dB and-11 dB or less in the two passbands,respectively,while achieving two transmission zeros in the two passbands,greatly enhancing the isolation between the two passbands,and the designed filter size is 0.46×0.46,the measurement results are basically consistent with the simulation results,which verifies the feasibility of the method.
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