Tunable Lowpass Filter with RF MEMS Capacitance and Transmission Line | Zendy

Shimul C. Saha | Zendy; Ulrik Hanke | Zendy; Håkon Sagberg | Zendy; Tor A. Fjeldly | Zendy; Trond Sæther | Zendy

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Tunable Lowpass Filter with RF MEMS Capacitance and Transmission Line

Author(s) -

Shimul C. Saha,

Ulrik Hanke,

Håkon Sagberg,

Tor A. Fjeldly,

Trond Sæther

Publication year - 2012

Publication title -

active and passive electronic components

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.144

H-Index - 22

eISSN - 1026-7034

pISSN - 0882-7516

DOI - 10.1155/2012/502465

Subject(s) - cutoff frequency , capacitive sensing , low pass filter , microelectromechanical systems , capacitance , transmission line , radio frequency , filter (signal processing) , electronic engineering , electric power transmission , cutoff , band pass filter , frequency response , electrical impedance , materials science , electrical engineering , engineering , optoelectronics , physics , electrode , quantum mechanics

We have presented an RF MEMS tuneable lowpass filter. Both distributed transmission lines and RF MEMS capacitances were used to replace the lumped elements. The use of RF MEMS capacitances gives the flexibility of tuning the cutoff frequency of the lowpass filter. We have designed a low-pass filter at 9–12 GHz cutoff frequency using the theory of stepped impedance transmission lines. A prototype of the filter has been fabricated using parallel plate capacitances. The variable shunt capacitances are formed by a combination of a number of parallel plate RF MEMS capacitances. The cutoff frequency is tuned from C to X band by actuating different combinations of parallel capacitive bridges. The measurement results agree well with the simulation result.

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