Title :
Analysis of a directional coupler using magnetic/dielectric hybrid transmission-line for cellular phone
Author :
Takizawa, Kazutaka ; Mizuta, So ; Nakazawa, Masahiro ; Sato, Toshiro ; Yamasawa, Kiyohito ; Miura, Yoshimasa ; Miyake, Yuko ; Akie, Masanori ; Uehara, Yuji ; Munakata, Makoto ; Yagi, Masaaki
Author_Institution :
Shinshu Univ., Nagano
Abstract :
Transmission characteristics of a directional coupler with a magnetic/dielectric thin film hybrid structure was analyzed on the basis of 3D electromagnetic field analysis. The device consisted of an inner dielectric/magnetic/dielectric sandwich structure, the top coupled signal lines, coupling capacitance composed of top rectangular electrode, and bottom ground plane. Both electric field coupling and magnetic field coupling between top signal lines were controllable by changing electrode size of coupling capacitance and spacing between top signal lines, respectively. From the numerical calculation of the signal transmission characteristics, an insertion loss was less than 0.6 dB, and signal directivity was more than 15 dB in the frequency range of 0.8-2 GHz used in the cellular phones.
Keywords :
cellular radio; electromagnetic coupling; electromagnetic fields; magnetic devices; transmission line theory; 3D electromagnetic field analysis; cellular phone; coupling capacitance; dielectric-magnetic-dielectric sandwich structure; directional coupler; electric field coupling; frequency 0.8 GHz to 2 GHz; magnetic field coupling; magnetic-dielectric hybrid transmission-line; rectangular electrode; Capacitance; Cellular phones; Couplings; Dielectric devices; Dielectric thin films; Directional couplers; Electrodes; Electromagnetic analysis; Magnetic analysis; Transmission lines; 3D-FEM; Directional coupler; electromagnetic coupling; insertion loss; magnetic/dielectric hybrid transmission-line; signal directivity;
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429665
