Title :
Design of Wide-Band, Sharp-Rejection Bandpass Filters With Parallel-Coupled Lines
Author :
Mandal, Mrinal Kanti ; Sanyal, Subrata
Author_Institution :
Dept. of Electron. & Electr. Commun. Eng., Indian Inst. of Technol., Kharagpur
Abstract :
An edge-coupled quarter wavelength resonator and half-wavelength open stubs are used for designing a highly selective wideband bandpass filter (BPF). A homogeneous medium is considered and the even-odd mode approach is used for filter analysis. Next, a microstrip line implementation procedure is described. The filter has sharp rejection, wide stopband, low insertion loss (IL), and fabrication simplicity. A prototype BPF having 69.5% 3-dB fractional bandwidth (FBW) is fabricated. A simple stub modification extends the upper 20-dB stopband to five times that of the filter upper cutoff frequency. Passband IL is within 1.6dB
Keywords :
band-pass filters; band-stop filters; microstrip filters; resonator filters; edge-coupled quarter wavelength resonator; filter analysis; half-wavelength open stubs; homogeneous medium; microstrip line; parallel coupled lines; wideband bandpass filter; Band pass filters; Bandwidth; Cutoff frequency; Fabrication; Insertion loss; Microstrip; Passband; Prototypes; Resonator filters; Wideband; Ground-plane aperture (GPA); open stub; parallel coupled microstrip line (PCML); wideband bandpass filter (BPF);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.884904
