Title :
Tunable bandstop filters using defected ground structure with active devices
Author :
Park, J.D. ; Sung, Y.J. ; Lee, S.H. ; Kim, Y.S.
Author_Institution :
Dept. of Radio Sci. Eng., Korea Univ., Seoul, South Korea
Abstract :
In this paper, tunable bandstop filters using defected ground structure (DGS) sections are presented. The DGS section is obtained by etching the conventional ground plane. To adjust the stopband, voltage controlled variable capacitor diodes (VVC) are equipped on the DGS section. The center frequency of the filter is varied from 1.44 GHz to 3.19 GHz as the reverse bias voltage is changed from 0 V to 20 V. The stopband of the proposed filter has a tunable range of 76%. Using more than two DGS units, deeper suppression and wider tunable bandwidth are yielded. Good agreements between the simulated and measured results are obtained.
Keywords :
active networks; band-stop filters; etching; microstrip filters; varactors; 0 to 20 V; 1.44 to 3.19 GHz; bandstop filters; conventional ground plane; deeper suppression; defected ground structure; etching; microstrip filter; tunable filters; voltage controlled variable capacitor diodes; wider tunable bandwidth; Capacitance; Capacitors; Diodes; Frequency; Inductance; Inductors; Microwave circuits; Microwave filters; Tunable circuits and devices; Voltage; Bandstop Filter; Microstrip Filter; Tunable Filter; Voltage Control;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1606278
