Title :
Tunable active filters having multilayer structure using LTCC
Author :
Kageyama, K. ; Saito, K. ; Murase, H. ; Utaki, H. ; Yamamoto, T.
Author_Institution :
Sumitomo Metal Electron. Devices Inc., Hyogo, Japan
Abstract :
Two types of tunable filter have been developed at 400 MHz and 800 MHz frequency band respectively. These filters have been fabricated with LTCC (low temperature cofired ceramics) multilayer technologies assisted by varactor diodes. Filter size is 5.6/spl times/5.6/spl times/3.0 mm. Each filter has about 11% and 13% tuning range of frequency with controlling voltage of 1-4 V, IL<2.0 dB, and has attenuation more than 40 dB at fo+-30% respectively. Temperature stability data is also discussed.
Keywords :
active filters; circuit stability; crystal filters; microwave filters; varactors; 1 to 4 V; 400 MHz; 800 MHz; LTCC; attenuation; controlling voltage; filter size; low temperature cofired ceramics; multilayer structure; temperature stability data; tunable active filters; varactor diodes; Active filters; Attenuation; Ceramics; Diodes; Frequency; Nonhomogeneous media; Temperature; Tuning; Varactors; Voltage control;
Conference_Titel :
Microwave Symposium Digest, 2001 IEEE MTT-S International
Conference_Location :
Phoenix, AZ, USA
Print_ISBN :
0-7803-6538-0
DOI :
10.1109/MWSYM.2001.967174
