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1. US20090072923 - Laminated balun transformer

Office United States of America
Application Number 12277357
Application Date 25.11.2008
Publication Number 20090072923
Publication Date 19.03.2009
Grant Number 7579923
Grant Date 25.08.2009
Publication Kind B2
IPC
H03H 7/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
7Multiple-port networks comprising only passive electrical elements as network components
H03H 7/42
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
7Multiple-port networks comprising only passive electrical elements as network components
42Balance/unbalance networks
H01P 3/08
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
PWAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE
3Waveguides; Transmission lines of the waveguide type
02with two longitudinal conductors
08Microstrips; Strip lines
CPC
H01F 27/2804
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
27Details of transformers or inductances, in general
28Coils; Windings; Conductive connections
2804Printed windings
H03H 7/42
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
7Multiple-port networks comprising only passive electrical elements as network components
42Balance/unbalance networks
Applicants Murata Manufacturing Co., Ltd.
Inventors Ishida Kosuke
Agents Keating &; Bennett, LLP
Priority Data 2006153210 01.06.2006 JP
Title
(EN) Laminated balun transformer
Abstract
(EN)

A laminated balun transformer that may be used for lines having various impedances includes a first magnetic substrate, a laminated body, a second magnetic substrate, and external electrodes. The laminated body includes a first transformer, a second transformer, and an insulator that covers the first and second transformers. The first transformer includes a primary coil and a secondary coil. The second transformer includes a primary coil and a secondary coil. The line width of the primary coil of the first transformer is set so as to decrease from the side of the internal electrode towards the side of the internal electrode. The line width of the secondary coil of the second transformer is also set so as to decrease from the side of the internal electrode towards the side of the internal electrode.