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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Abstract

A terahertz quasi-optical mode converter with wide bandwidth was studied and designed. The quasi-optical mode converter used Denisov launcher， which had high efficiency， and worked in TE_6.2 mode. It was used to realize mode conversion in gyrotron. As the parameters of Denisov launcher were the main factors affecting the broadband performance of quasi-optical mode converter， the optimal design of the radiator parameters could increase the bandwidth of the mode converter. Using the self-developed quasi-optical simulation program for simulation， the bandwidth of the mode converter can reach 2 GHz （center frequency 94 GHz）.

Keywords

broadband mode converting quasi-optics Terahertz

R (ϕ, z) = r_{w} + α z + δ_{1} (z) c o s [β_{1} z - l_{1} ϕ] + δ_{2} (z) c o s [β_{2} z - l_{2} ϕ]

(1)

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\begin{array}{l} l_{1} = 1, β_{1} = | (β_{m + 1, n} - β_{m - 1, n}) | / 2 轴 向 扰 动 \\ l_{2} = 3, β_{2} = | (β_{m + 3, n - 1} - β_{m - 3, n + 1}) | / 2 角 向 扰 动 \end{array}

(2)

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θ_{B} = s i n^{- 1} \frac{k_{t}}{k} = s i n^{- 1} \frac{χ_{m}^{'} c}{r_{w} 2 π f}

(3)

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\begin{array}{l} β_{1} = \frac{1}{2} | (β_{m + 1, n} - β_{m - 1, n}) | = \frac{1}{2} | \sqrt[]{{(\frac{ω}{c})}^{2} - {(\frac{χ_{m + 1, n}^{'}}{r_{w}})}^{2}} - \sqrt[]{{(\frac{ω}{c})}^{2} - {(\frac{χ_{m - 1, n}^{'}}{r_{w}})}^{2}} | \\ β_{2} = \frac{1}{2} | (β_{m + 3, n - 1} - β_{m - 3, n + 1}) | = \frac{1}{2} ∣ \sqrt[]{{(\frac{ω}{c})}^{2} - {(\frac{χ_{m + 3, n - 1}^{'}}{r_{w}})}^{2}} - \sqrt[]{{(\frac{ω}{c})}^{2} - {(\frac{χ_{m - 3, n + 1}^{'}}{r_{w}})}^{2}} | \end{array}

(4)

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η_{s} = \frac{\int_{s} | E_{1} | \cdot | E_{0} | d S}{\sqrt[]{\int_{s} | E_{1} |^{2} d S \cdot \int_{s} | E_{0} |^{2} d S}}

(5)

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η_{v} = \frac{\int_{s} | E_{1} | \cdot | E_{0} | e^{j (ϕ_{1} - ϕ_{0})} d S \cdot \int_{s} | E_{1} | \cdot | E_{0} | e^{j (ϕ_{0} - ϕ_{1})} d S}{\int_{s} | E_{1} |^{2} d S \cdot \int_{s} | E_{0} |^{2} d S}

(6)

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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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