Design and analysis of a broadband quasi-optical mode converter with a Denisov launcher

Hui-Qi BIAN; Chao-Hai DU; Shi PAN; Pu-Kun LIU

doi:10.11972/j.issn.1001-9014.2020.05.006

Journals >Journal of Infrared and Millimeter Waves >Volume 39 >Issue 5 >Page 567 > Article

Journal of Infrared and Millimeter Waves
Vol. 39, Issue 5, 567 (2020)

Design and analysis of a broadband quasi-optical mode converter with a Denisov launcher

Hui-Qi BIAN^1、2, Chao-Hai DU^2、*, Shi PAN², and Pu-Kun LIU^2、*

Author Affiliations

¹Beijing Institution of Radio Measurement， Beijing100854， China

²School of Electronics Engineering and Computer Science， Peking University， Beijing100871， China

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DOI: 10.11972/j.issn.1001-9014.2020.05.006 Cite this Article

Hui-Qi BIAN, Chao-Hai DU, Shi PAN, Pu-Kun LIU. Design and analysis of a broadband quasi-optical mode converter with a Denisov launcher[J]. Journal of Infrared and Millimeter Waves, 2020, 39(5): 567 Copy Citation Text

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Fig. 1. The configuration of the quasi-optical mode converter with a Denisov launcher. 1: Denisov launcher, 2~5: mirror system 6: output window

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Fig. 2. Dimpled-wall waveguide of Denisov launcher

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Fig. 3. Geometric optics mode of rays in the launcher

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Fig. 4. (a) Variation of axial reflective angle θB to frequency f in Denisov launcher (b) Axial deviation ΔL of the broadband beam emitted by Denisov launcher on parabolic mirror 2 to frequency f in Denisov launcher

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Fig. 5. Variation of structural parameter β of spiral corrugated waveguide in Denisov launcher to frequency f

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Fig. 6. Variation of axial reflective angle θB and cutlength LC to tbe radius of Denisov launcher rw

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Fig. 7. Variation of structural parameter β of spiral corrugated waveguide in Denisov launcher to frequency f in different radii of Denisov launcher rw

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Fig. 8. The The disturbance amplitude of Denisov launcher.in TE_6.2 mode

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Fig. 9. (a) The field distribution of Denisov launcher on the unrolled waveguide wall at 94 GHz in TE_6,2 mode. The white line represents the cutting position (b) The 3D field distribution of Denisov launcher on the unrolled waveguide wall at 94 GHz in TE_6,2 mode.

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Fig. 10. The whole field distribution on quasi-optical mode converter at 94 GHz in TE_6,2 mode.

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Fig. 11. The field distribution on the output window at different frequency points from 93~95 GHz in TE_6,2 mode.

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角向耦合

轴向

耦合

TE_4,3 (3%)

TE_7,2 (11%)

TE_10,1 (3%)

TE_3,3 (11%)

TE_6,2 (44%)

TE_9,1 (11%)

TE_2,3 (3%)

TE_5,2 (11%)

TE_8,1 (3%)

Table 1. 形成高斯模式所需的卫星模式及功率分布表

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镜面

Denisov辐射器1

中心 $(0,0, 0)$

抛物面反射镜2

中心 $(4.0,30.0,20.0)$

抛物面反射镜3

中心

$(0, - 30.0,46.5)$

平面镜4

中心 $(0,70.0,105.0)$

抛物面反射镜5

中心 $(0,80.0,200.0)$

输出窗6

中心

$(0, - 100.0,200.0)$

参数

半径 $r_{w} = 6.85 m m$

切口长度 $L_{c} = 21.2 m m$

抛物线参数

$1 / F_{1} = 40 m m$

$1 / F_{2} = \infty$

宽度

$Δ X = 100 m m$

$Δ Z = 75 m m$

效率 97.0%

抛物线参数

$1 / F_{1} = 100 m m$

$1 / F_{2} = 100 m m$

宽度

$Δ X = 120 m m$

$Δ Z = 100 m m$

效率 97.5%

宽度

$Δ X = 80 m m$

$Δ Z = 80 m m$

效率 99.3%

旋转角度

$Δ φ = 16 . 5^{\circ}$

宽度

$Δ X = 80 m m$

$Δ Z = 80 m m$

效率 99.5%

半径

Φ = 40 m m

Table 2. 准光模式变换器各部分参数表

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频率f / GHz	93	93.5	94	94.5	95
标量模式纯度 $η_{s}$ / %	97.5	99.0	99.2	98.6	97.4
矢量模式纯度 $η_{v}$ / %	96.4	97.6	96.3	92.9	90.1
模式转换效率 $η$ / %	91.2	91.1	92.0	91.8	89.4

Table 3. 输出窗处高斯波束93~95 GHz的标量模式纯度、矢量模式纯度和模式转换效率

Hui-Qi BIAN, Chao-Hai DU, Shi PAN, Pu-Kun LIU. Design and analysis of a broadband quasi-optical mode converter with a Denisov launcher[J]. Journal of Infrared and Millimeter Waves, 2020, 39(5): 567

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