Title :
CPW band-stop filter using unloaded and loaded EBG structures
Author :
Karim, M.F. ; Liu, A.-Q. ; Alphones, A. ; Zhang, X.J. ; Yu, A.B.
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
Two different structures of unloaded and loaded electromagnetic bandgaps (EBG) are proposed. The models of the unloaded and loaded unit structures are derived by equivalent circuit approach and full-wave electromagnetic simulation is used for extracting the values of the lumped elements in the circuit. A band-stop filter (BSF) has been designed with flat response at a selected frequency by cascading the unit EBG structures. The EBG filter is fabricated on high resistivity silicon substrate employing a microelectromechanical systems (MEMS) surface micromachining process. The measurement results for the loaded EBG reveals a 20 dB stop-band with a bandwidth of 13.2 GHz. The lower and the higher pass-band insertion losses are less than 2 dB and 4.5 dB, respectively. EBG band-stop filters fabricated by the MEMS process have immense potential to be integrated with CMOS devices owing to compactness and low cost.
Keywords :
CMOS integrated circuits; band-stop filters; coplanar waveguides; equivalent circuits; lumped parameter networks; micromachining; micromechanical devices; microwave integrated circuits; photonic band gap; waveguide filters; 13.2 GHz; BSF; CMOS device; CPW band-stop filter; MEMS; electromagnetic bandgap; equivalent circuit; full-wave electromagnetic simulation; high resistivity silicon substrate; loaded EBG structure; lumped element; microelectromechanical system; surface micromachining process; unloaded EBG structure;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings
DOI :
10.1049/ip-map:20050096
