A Novel Microstrip Dual-Mode Band-pass Filter For second Harmonic Suppression


A novel design scheme has been introduced in this paper to suppress 2nd harmonicfrom response of band-pass filter (BPF) which appears at about . The filter iscomposed of perturbed, square-ring resonator and open end stup length wherewavelength for harmonic located on the output feeder port work as Band StopFilter. The harmonic suppression of the BPF may be realized by choosing aproper length of the open stup which is equal to . The BPF investigated is for morefrequencies such as (GPS, ISM, RFID, and GSM).The performance of BPFs with open stup structures has been analyzed usingmethod of moments (MoM) based software microwave office, which is widelyadopted in microwave research and industry.