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Method for calculating transmission loss or coupling loss of leaky coaxial cable

A technology for leaking coaxial cables and transmission loss, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as error design and failure

Inactive Publication Date: 2011-09-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(4) The electromagnetic simulation method of periodic structure is invalid for this kind of structure
Although this simulation takes into account the coupling effect between the slots within this limited length on the transmission loss L t and coupling loss L r effect, but in extrapolating the transmission loss L of a coaxial cable with n slot leaky t and coupling loss L r When , the gap coupling between segments cannot be taken into account
The resulting errors become the main cause of design failure

Method used

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  • Method for calculating transmission loss or coupling loss of leaky coaxial cable
  • Method for calculating transmission loss or coupling loss of leaky coaxial cable
  • Method for calculating transmission loss or coupling loss of leaky coaxial cable

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Before describing the specific embodiments in detail, the theory on which the present invention is based is briefly introduced.

[0032] Through a large number of experimental data verification, the applicant found that the transmission loss L t and coupling loss L r Values ​​in the length direction (such as the Z axis) have convergence properties.

[0033] Such as image 3 As shown in the figure, at a certain frequency, the transmission loss value L of the leaky coaxial cable t During the measurement process, as the z-axis length (that is, the length of the leaky coaxial cable) increases, its value gradually converges to a value L to , this convergent value is considered to be the closest to the true value of the leaky coaxial cable transmission loss.

[0034] Such as Figure 5 As shown, the voltage V measured on a standard dipole antenna ...

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Abstract

The invention relates to a method for calculating the transmission loss or coupling loss of a leaky coaxial cable. The method is used for calculating the transmission loss or coupling loss according to the rule that values of the transmission loss and coupling loss of the leaky coaxial cable in a length direction such as an axis Z both have convergence characteristics. In the method, in the calculation of the values of the transmission loss and coupling loss of the leaky coaxial cable, the influence of coupling effects between slits in a finite length on the transmission loss and the coupling loss is taken into account, and the virtual average transmission loss and virtual average coupling loss of the infinitely long leaky coaxial cable are calculated by utilizing an accelerating convergence method to obtain the values, closest to true values, of the transmission loss and coupling loss of the leaky coaxial cable with a certain length.

Description

technical field [0001] The invention belongs to the technical field of communication cables, in particular to the technical field of leaky coaxial cables. Background technique [0002] The leaky coaxial cable (Leaky Coaxial Cable, LCX) has the function of signal transmission and also has the function of antenna. Through the control of the opening of the outer conductor, the controlled electromagnetic wave energy can be radiated and received evenly along the line, so as to realize the protection of the blind area of ​​the electromagnetic field. Coverage has achieved the purpose of smooth mobile communication. Such as figure 1 As shown, the leaky coaxial cable consists of the innermost inner conductor 1, the insulator 2 positioned at the periphery of the inner conductor 1, the outer conductor 3 with periodically arranged slots 5 positioned at the periphery of the insulator 2, and the outer conductor 3 positioned at the periphery of the outer conductor 3. Set of 4 composition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 喻志远郭丽丽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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