Title :
Directional coupler composed of CoFeB metallic magnetic film/polyimide dielectric film hybrid transmission line
Author :
Takizawa, K. ; Nakazawa, M. ; Sato, T. ; Yamasawa, K. ; Miura, Y. ; Munakata, M. ; Yagi, M.
Author_Institution :
Fac. of Eng., Shinshu Univ., Nagano, Japan
Abstract :
This paper describes a novel thin film type directional coupler using magnetic/dielectric hybrid transmission line device. The hybrid transmission line with a dielectric/magnetic/dielectric sandwich structure has a large effect of wavelength shortening. As a result of signal characteristics evaluation, the directivity of the signal in the device was higher than 18 dB, and insertion loss was less than 0.6 dB at the operating frequency of 0.8∼2 GHz of the cellular phones.
Keywords :
boron alloys; cobalt alloys; dielectric thin films; directional couplers; iron alloys; polymer films; transmission lines; 0.8 to 2 GHz; CoFeB; dielectric/magnetic/dielectric sandwich structure; hybrid transmission line; insertion loss; metallic magnetic film; polyimide dielectric film; signal directivity; thin film type directional coupler; wavelength shortening; Dielectric devices; Dielectric films; Dielectric thin films; Directional couplers; Magnetic devices; Magnetic films; Polyimides; Sandwich structures; Thin film devices; Transmission lines;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1606932
