A 900 MHz 90 degrees hybrid for QPSK modulator

Author

Arai, S. ; Kato, A. ; Minami, K. ; Nishikawa, T.

Author_Institution

Murata Manuf. Co. Ltd., Kyoto, Japan

fYear

1991

fDate

10-14 July 1991

Firstpage

857

Abstract

A miniaturized surface-mounting 90-degrees hybrid using a meandered thin-film microstrip line directional coupler has been developed for a QPSK (quadrature phase shift keying) modulator. The coupling level of the narrowly space parallel lines on a high dielectric constant (K) ceramic substrate was calculated using the finite element method (FEM) and a circuit simulator. Balanced outputs and quadrature phase difference in the frequency range of 950 MHz+or-10 MHz were obtained experimentally with a size of 1.7 (H)*4.8 (W)*6.2 (D) mm.<>

Keywords

cellular radio; directional couplers; modulators; phase shift keying; strip line components; 940 to 960 MHz; QPSK modulator; balanced outputs; circuit simulator; coupling level; digital cellular radio; finite element method; high dielectric constant ceramic substrate; meandered thin-film microstrip line directional coupler; quadrature phase difference; surface-mounting hybrid; Ceramics; Coupling circuits; Dielectric substrates; Dielectric thin films; Directional couplers; High-K gate dielectrics; Microstrip; Phase modulation; Quadrature phase shift keying; Thin film circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1991., IEEE MTT-S International

Conference_Location

Boston, MA, USA

ISSN

0149-645X

Print_ISBN

0-87942-591-1

Type

conf

DOI

10.1109/MWSYM.1991.147142

Filename

147142