Iron-core material iron-core and transformer for balancing-non-balancing transformer

A balanced transformer and balanced technology, applied in the direction of transformer/inductor magnetic core, broadband transformer, fixed transformer or mutual inductance, etc., can solve problems such as unbalanced transformer, failure to achieve balance, and increase in the frequency of resonance

Inactive Publication Date: 2004-11-24
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ferrite has a theory called "snake-shaped limit line", and it is impossible to increase the frequency at which resonance starts to a high-frequency band exceeding this limit, and it has not yet been possible to achieve a balance-unbalance that exhibits good characteristics in the high-frequency band transformer

Method used

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  • Iron-core material iron-core and transformer for balancing-non-balancing transformer
  • Iron-core material iron-core and transformer for balancing-non-balancing transformer
  • Iron-core material iron-core and transformer for balancing-non-balancing transformer

Examples

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Embodiment

[0032] Next, specific examples of the present invention are shown to explain the present invention in more detail.

[0033] (Manufacturing of cores for baluns (samples 1 to 3))

[0034] First, using a balun core material composed of α-alumina powder (average particle size: 0.5 μm) which is a non-magnetic material, a paste having the following composition was prepared as follows: Figure 4 As shown, the paste is used to connect three blocks 33a, 33a, 33b with two blocks 34 to form an E-shaped balun core 32 and a disc-shaped test piece (forming pressure is 1t / cm 2 ), fired in an air atmosphere for 2 hours at the temperature shown in Table 1 below.

[0035] Composition of the paste

[0036] ・Core material for balun transformers …90% by weight

[0037] ・Amount of binder …10% by weight

[0038] (Polyvinyl alcohol (Kuraray Co., Ltd. PVA124) 6% aqueous solution)

[0039]The density, dielectric constant, and resistivity of the obtained balun cores (samples 1 to 3) were measured...

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Abstract

There is disclosed a BALUN transformer core material which has no magnetic permeability, contains a non-magnetic material and is not influenced by the frequency property of the magnetic permeability even in a high-frequency band. A BALUN transformer core which is obtained by pressing and sintering the BALUN transformer core material has no magnetic permeability and has a high specific resistance. A BALUN transformer which is obtained by applying a winding to the BALUN transformer core is a high-property BALUN transformer which can be operated in a high-frequency band of 600 MHz or more.

Description

technical field [0001] The present invention relates to an iron core material for a balun transformer, an iron core for a balun transformer obtained by molding the material and firing the material, and a balun transformer usable in a frequency band above 600 MHz. Background technique [0002] A balanced-unbalanced transformer (Balance to UnBalance transformer, referred to as BALUN) is a transformation part for smooth connection between an unbalanced circuit and a balanced circuit, and is used in various electronic instruments, such as antenna parts in communication circuits, etc. . Moreover, with the miniaturization and high frequency of electronic equipment in recent years, corresponding parts are also indispensable among the constituent parts of electronic equipment, and balun transformers are no exception. [0003] A balanced-unbalanced transformer is usually made by winding a two-wire coil (two-wire non-inductive coil) on a ring-shaped or solenoid-shaped balanced-unbala...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26H01F1/34H01F17/06H01F19/06H01F27/255H03H7/42
CPCH03H7/42H01F17/062
Inventor 柿沼制佐藤孝辉伊藤纲鬼塚雅広
Owner TDK CORPARATION
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