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Coupled Transmission Lines, Baluns, and Power Combiners

A technology for coupling transmission lines and power combiners, which is applied to waveguide-type devices, circuits, connecting devices, etc., and can solve problems such as the use of baluns

Active Publication Date: 2019-01-22
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, baluns containing ferrite materials cannot be used in a magnetic field environment, because the ferrite materials will form a magnetic field saturation

Method used

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  • Coupled Transmission Lines, Baluns, and Power Combiners
  • Coupled Transmission Lines, Baluns, and Power Combiners
  • Coupled Transmission Lines, Baluns, and Power Combiners

Examples

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Embodiment Construction

[0052] Specific implementations of the present invention will be described below. It should be noted that in the process of specific descriptions of these implementations, for the sake of concise description, it is impossible for this specification to describe all the characteristics of the actual implementations in detail. It should be understood that, in the actual implementation process of any embodiment, just like in the process of any engineering project or design project, in order to achieve the developer's specific goals and to meet system-related or business-related constraints, Often a variety of specific decisions are made, and this can vary from one implementation to another. In addition, it will be appreciated that while such development efforts may be complex and lengthy, the technology disclosed in this disclosure will be Some design, manufacturing or production changes based on the content are just conventional technical means, and should not be interpreted as i...

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PUM

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Abstract

The invention relates to a coupling transmission line, a balance-unbalance converter and a power combiner, and specifically relates to an impedance conversion circuit comprising the coupling transmission line. The coupling transmission line comprises a first transmission line having a second port and a third port, and a second transmission line having a first port and a fourth port. The first port is configured as an input port. The fourth port is configured as a short circuit or an open circuit. One of the second port and the third port is configured as an output port; and the other one of the second port and the third port is configured as a short circuit or an open circuit. The impedance conversion circuit does not comprise ferrite substances. Due to the fact that the impedance conversion circuit does not comprise the ferrite substances, the impedance conversion circuit can be put into a strong magnetic field environment of a magnetic resonance imaging system to convert the impedance without being interfered by the strong magnetic field.

Description

technical field [0001] The invention relates to the technical field of radio frequency circuits, in particular to a coupled transmission line, a balanced-unbalanced converter and a power combiner. Background technique [0002] In a radio frequency power amplifier included in magnetic resonance imaging (magnetic resonance imaging, MRI) equipment, a push-pull circuit is generally used. In this push-pull circuit, a balanced-tounbalanced transformer (balun) is a necessary component, and the input balanced-tounbalanced transformer is used to convert the signal on the unbalanced transmission line into the signal of the RF power amplifier. Balanced input, output baluns are used to convert the balanced output of an RF power amplifier to an unbalanced load. [0003] Above the S-band, baluns can be easily implemented with 1 / 4 wavelength transmission lines, but for UHF, VHF and lower bands, due to their longer wavelengths, limited by size, [0004] It is difficult to realize in this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P5/00H01P5/10H01P5/12
Inventor 宋婷婷陈基锋
Owner GENERAL ELECTRIC CO