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Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide

An asymmetric structure, speed compensation technology, applied in the microwave field, can solve problems such as cost increase and volume integration reduction, and achieve the effect of reducing process and cost

Inactive Publication Date: 2009-09-02
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the erected air bridge and the coplanar waveguide are not on the same plane, the process of erecting the air bridge is added to the manufacturing process, and the cost also increases, and from the perspective of integration, the increase in volume leads to a decline in integration.

Method used

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  • Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide
  • Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide
  • Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide

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Embodiment 1

[0037] Embodiment 1: as figure 1 as shown, figure 1 The structure and parameters of the coplanar waveguide grating structure are given. Different coplanar waveguide grating structures can be obtained by changing its structural parameters. Depend on figure 1 It can be seen that k 1 and k 2 are the propagation constants of the electromagnetic wave on the non-grid structure and the grid structure, respectively. In order to prove the change of the grid structure to the propagation speed of electromagnetic waves and understand the effect of different structures, the simulation software is used to calculate the k 2 k 1 ratio, as shown in Table 1. The specific structure is set as follows: w c = 0.25mm, w g = 1 mm, w s = 0.1mm, t = 0.0625mm, ε r =12.9, Z c =50Ω. Among them, Z c is the characteristic impedance of the coplanar waveguide. It can be seen from the table that k 2 / k 1 Both are greater than 1, indicating that the grid structure does have a slow wave effect. ...

Embodiment 2

[0044] Embodiment 2: as figure 2 As shown, a rectangular grid velocity-compensated curved coplanar waveguide.

[0045] When the grid structure in Table 1 is specifically applied to a discontinuous coplanar waveguide, the slot with a shorter path on the coplanar waveguide should be set as a grid structure. Taking the 90° curved coplanar waveguide as an example to illustrate the specific implementation, since the path length of the outer slot is greater than that of the inner slot, the inner slot should be made into a grid structure. figure 2 The structure and parameters of the 90° curved coplanar waveguide grating structure are given.

[0046] Formulas (1) and (2) give the calculation formulas for determining the grid length (the parameters in the formula are shown in Table 1):

[0047] k 2 S=k 1 (S+ΔS)(1)

[0048] S = ΔS k 2 k ...

Embodiment 3

[0053] Embodiment 3: as image 3 As shown, the deformed grid velocity compensation type 90° arc-shaped curved coplanar waveguide structure.

[0054] Since the structure is arc-shaped at the bend, the grid structure changes accordingly, forming a deformed grid.

[0055] Numerical calculation results

[0056] The 90° curved coplanar waveguides with grid structure types A1, C3, D2 and D3 are analyzed and calculated by simulation software, and some numerical calculation results are obtained. The specific structural settings are as follows: L=7.65mm; C3: S=4.7mm; D2: S=3.1mm; D3: S=4.925. Other structural parameters are shown in Table 1. Figure 8 , Figure 9 The S of these four structures are given respectively 11 , S 21 The magnitude of the parameter varies with frequency. Depend on Figure 8 , Figure 9 It can be seen that the reflection coefficient S 11 reduced, the transfer coefficient S 21 It increases in the higher frequency region, indicating that the transmissio...

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Abstract

The speed compensation method of asymmetric structure grid uses the regular grid structure and deformed grid structure with various slot widths that change periodically or quasi-periodically along the axial direction as the basic slow wave structure, and calculates the length and period of the grid structure. According to the length and period of the grid structure, the slot with a shorter path on the discontinuous coplanar waveguide is set as the grid structure. In the speed-compensated curved coplanar waveguide, the structure of the outer slot on the curved coplanar waveguide remains unchanged, and the width of the inner slot changes periodically along the axial direction to form a grid. Making the gap of the shorter path of the curved waveguide into the gap of the band grid structure can slow down the propagation speed of the electromagnetic wave on the path, so that the phases on the two paths after passing through the curved structure are the same, and the signals are synchronized in time. This structure is directly processed on the floor and signal lines of the coplanar waveguide, which can be directly completed in the process of making the coplanar waveguide without increasing the volume of the original circuit, and is suitable for mass production of printed circuit technology.

Description

technical field [0001] The invention relates to a speed compensation method of an asymmetric structure grid and a speed compensation type curved coplanar waveguide, belonging to the microwave technology field in electronic science and technology. Background technique [0002] Coplanar waveguides have the advantages of easy series-parallel connection, low radiation, low dispersion, and easy integration, so they are widely used in monolithic microwave integrated circuits. However, since the coplanar waveguide structure contains two slots as transmission paths, when the coplanar waveguide structure is bent, the lengths of the two slots will be unequal, so there will be a phase difference after the electromagnetic wave passes through the two slots. The performance is that the signals in the two gaps are no longer synchronized, resulting in large electromagnetic wave reflection, radiation, signal dispersion, broadening, etc., which is not conducive to energy transmission, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P3/14H01P3/12H01P3/00
Inventor 王均宏
Owner BEIJING JIAOTONG UNIV
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