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Balun

一种一起、同轴电缆的技术，应用在巴伦领域，能够解决不能提供、小体积的等问题，达到成本低、降低阻抗、降低特性阻抗的效果

Active Publication Date: 2013-10-30
GE MEDICAL SYST GLOBAL TECH CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a new balun to solve the problem that the prior art cannot provide a balun with small volume and high power capability that can be used in a magnetic field environment

Method used

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] The balun in this embodiment includes two 50 ohm coaxial cables 101 and 102, each 40 cm in length.

[0027] Such as figure 1 As shown, the coaxial cables 101 and 102 are closely arranged together first, and then wound into three rings with a diameter of 25 mm in the shape of a helix, and the winding of each ring of each coaxial line is shape like image 3 As shown, two adjacent rings are closely arranged together.

[0028] Such as figure 2 with Figure 4 As shown, the inner conductors 103 and 104 of one end of the coaxial cables 101 and 102 are welded together, and the outer conductors 105 and 106 of this end are also welded together; the inner conductors 107 and 108 of the other ends of the coaxial cables 101 and 102 are welded Together, the outer conductors 109 and 110 at this end are also welded together, that is, two coaxial ca...

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PUM

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Abstract

Embodiments of the present invention relate to the technical field of RF circuits, and in particular, to a balun. In an embodiment of the present invention, a balun is provided which comprises at least two coaxial cables, each of which is wound into at least one loop, and the inner and outer conductors of one end of all coaxial cables are connected respectively to each other and the inner and outer conductors of the other end are also connected to each other. The novel balun according to the embodiments of the present invention has a small size but a large power capacity and low cost, and can be used in a magnetic field environment.

Description

technical field [0001] The invention relates to the technical field of radio frequency circuits, in particular to a balun. Background technique [0002] In RF power amplifiers, push-pull circuits are generally used. figure 1 Shown is a typical push-pull circuit. In this circuit, a balun (also known as a balanced feed converter or a transmission line balancer) is a necessary component. The input balun 1 is used to convert the signal on the unbalanced transmission line into a balanced input of the successful amplifier, and the output balun 2 Convert the balanced output of the power amplifier to the unbalanced load. [0003] Above the S-band, the balun can be easily implemented with a 1 / 4 wavelength transmission line, but for UHF, VHF and lower bands, due to their longer wavelengths and limited size, it is difficult to implement this way . The practice in the prior art is to use ferrite material to realize such a balun. [0004] Some RF power amplifiers need to be used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/10
CPCH03H7/42H01P5/10
Inventor 刘渝廖安谋邢昊洋彭奇斌黄海赵晨星
Owner GE MEDICAL SYST GLOBAL TECH CO LLC
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