Title :
Low-loss bandpass RF filter using MEMS capacitance switches to achieve a one-octave tuning range and independently variable bandwidth
Author :
Young, R.M. ; Adam, John D. ; Vale, C.R. ; Braggins, T.T. ; Krishnaswamy, S.V. ; Milton, C.E. ; Bever, D.W. ; Chorosinski, L.G. ; Li-Shu Chen ; Crockett, D.E. ; Freidhoff, C.B. ; Talisa, S.H. ; Capelle, E. ; Tranchini, R. ; Fende, J.R. ; Lorthioir, J.M. ;
Author_Institution :
Northrop Grumman Corp, Baltimore, MD, USA
Abstract :
We demonstrate a low insertion loss (1.5dB) tunable two-pole bandpass radio frequency filter with a tuning range of one octave (812-1752 MHz). It is also tunable in band width, with 3dB-bandwidths of 7 to 42% being achieved. The circuit used consists of two fixed high quality factor toroidal inductors mounted on a printed circuit board next to a fused-quartz substrate on which were fabricated the MEMS (Micro-Electro-Mechanical System) capacitance switches. Five arrays of MEMS elements, with a total of 34 MEMS bridges, are used on this chip. Each array is independently addressable in a four-bit scheme to permit well matched, independent tuning of the center frequency and bandwidth.
Keywords :
UHF circuits; UHF filters; band-pass filters; circuit tuning; inductors; losses; microswitches; 1.5 dB; 812 to 1752 MHz; MEMS bridges; MEMS capacitance switches; center frequency; four-bit scheme; fused-quartz substrate; independently variable bandwidth; insertion loss; low-loss bandpass RF filter; one-octave tuning range; quality factor; toroidal inductors; tuning range; two-pole filter; Band pass filters; Bandwidth; Capacitance; Circuit optimization; Insertion loss; Micromechanical devices; Radio frequency; Switches; Tunable circuits and devices; Tuning;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1210485
