Compact Triple Notches Bandstop Microstrip BPF by Differential Mod in L-Band for Applications GPS and ۳G-GSM, Wi-Fi, and Radio Amateur

In this Research, the design of a Bandpass Filter (BPF) with the capability to triple notches bandstop has been discussed. The filter has been designed in (L=۱-۲GHz) frequency band triple notches bandstop. Resonators of the bandpass filter have been designed by using Harpin and Parallel Lines Coupling (PLC) techniques. In addition, the impedance and the admittance mod of the sub-resonators have been modified by applying the step-impedance technique, so has been applied these methods to improve different quantities, including separation parameter values, Time Delay (TD), and flowing signal transfer coefficient in the filter substrate, and the signal will have the least drop in the output. This filter has been chosen to determine interfering stop-band in the frequency band of ۳G communication protocol, GPS, and amateur radio. The amateur radio band has been used in near-field wireless communication and portable weather forecast radar. Roger ۴۰۰۳ has been used as the subplate with a permittivity factor of ۳.۳۸, and the dimensions of the subplate are ۰.۵۰۸mm and ۲۰mm. The overall dimension of the designed filter is ۱۵۲*۲mm. The proposed approach has been designed by the HFSS.