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

fYear

2006

fDate

12-15 Dec. 2006

Firstpage

1384

Lastpage

1387

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/APMC.2006.4429665

Filename

4429665