Title :
Design of Compact Bandpass Filters with λg/4 Short Stubs Using Transmission Zero
Author :
Nam, Hee ; Yun, Tae-Soon ; Yoon, Ki-Cheol ; Lee, Jong-Chul
Author_Institution :
RFIC Educ. & Res. Center, Kwangwoon Univ., Seoul
Abstract :
In this paper, compact bandpass filters with λg/4 short stubs by microstrip line on duroid substrate are presented. This kind of filter shows flexible bandwidth with variation of the position of the short stub using the external quality factor, Qe without changing the impedance value at microwave. This filter provides compact design and sharp skirt characteristic by transmission-zero. The bandpass filters can be realized with wide (60 %) and narrow (10 %) bandwidth just by adjusting the position of the short stubs. They show the insertion losses of 0.5 dB and 1.5 dB, and the return losses of 10 dB and 13 dB at the center frequency of 2 GHz, respectively.
Keywords :
Q-factor; band-pass filters; microstrip lines; microwave filters; 0.5 dB; 1.5 dB; 10 dB; 13 dB; 2 GHz; compact bandpass filter; duroid substrate; external quality factor; flexible bandwidth; insertion loss; microstrip line; microwave impedance value; return loss; sharp skirt characteristic; short stub filter; transmission zero; Band pass filters; Bandwidth; Filtering theory; Frequency; Impedance; Integrated circuit technology; Microstrip filters; Microwave filters; Q factor; Superconducting transmission lines; Short stub filter; external quality factor; transmission-zero;
Conference_Titel :
Microwave Conference, 2006. 36th European
Conference_Location :
Manchester
Print_ISBN :
2-9600551-6-0
DOI :
10.1109/EUMC.2006.281222
