Title :
Novel Sapphire Directional Filters for Application to Ultra Low Phase Noise Oscillators
Author :
Shtin, Nicolás A. ; Romero, José Mauricio Lépez ; Prokhorov, Eugen
Author_Institution :
CINVESTAV-IPN, Queretaro
Abstract :
Traveling wave (TW) sapphire whispering gallery resonator (WGR) is considered to be a very attractive device for low phase noise microwave frequency sources. However, it was found that TW WGR with distributed coupling is very sensible to the parameters of the coupling and excitation of the pure TW in high-Q WGR is a big challenge. This paper deals with a novel sapphire TW WGR based on orthogonal lumped couplings and 3-db quadrature directional couplers. A general theoretical background of the proposed TW WGR as well as its 3D finite element analysis and experimental results are presented. Finally a novel ultra low phase noise oscillator configuration based on the TW WGR directional filter is proposed
Keywords :
directional couplers; finite element analysis; microwave filters; microwave oscillators; resonators; sapphire; waveguide filters; whispering gallery modes; 3D finite element analysis; TW; WGR; distributed coupling; microwave frequency source; orthogonal lumped couplings; quadrature directional couplers; sapphire directional filters; traveling wave; ultra low phase noise oscillators; whispering gallery resonator; Directional couplers; Finite element methods; Frequency conversion; Microwave filters; Microwave frequencies; Microwave oscillators; Phase noise; Probes; Q factor; Resonator filters; Whispering gallery resonator; directional filter; phase noise; traveling wave;
Conference_Titel :
Electrical and Electronics Engineering, 2006 3rd International Conference on
Conference_Location :
Veracruz
Print_ISBN :
1-4244-0402-9
Electronic_ISBN :
1-4244-0403-7
DOI :
10.1109/ICEEE.2006.251878
