Title :
Tunable active filters having multilayer structure using LTCC
Author :
Kageyama, Keisuke ; Saito, Kohki ; Murase, Hisanori ; Utaki, Hideki ; Yamamoto, Toshishige
Author_Institution :
Sumitomo Metal Electron. Devices Inc, Hyogo, Japan
fDate :
12/1/2001 12:00:00 AM
Abstract :
Two types of tunable filters have been developed at 400- and 800-MHz frequency bands, respectively. These filters have been fabricated with low-temperature co-fired-ceramics multilayer technologies assisted by varactor diodes. The filter size is 5.6 × 5.6 × 3.0 mm. Each filter has approximately 11% and 13% tuning range of frequency with a controlling voltage of 1-4 V, IL < 2.0 dB, and has an attenuation over 40 dB at fo ± 30%, respectively. Temperature stability data is also discussed
Keywords :
Q-factor; UHF filters; active filters; band-pass filters; circuit tuning; frequency response; varactors; 1 to 4 V; 400 MHz; 800 MHz; LTCC; bandpass filters; finite-element method; frequency responses; insertion losses; multilayer structure; temperature stability; tunable active filters; varactor diodes; Active filters; Attenuation; Diodes; Frequency; Nonhomogeneous media; Stability; Temperature; Tuning; Varactors; Voltage control;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
