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A Gaussian beam mode filter with a diagonal horn structure and its realization method

A Gaussian beam and horn technology, applied in the field of Gaussian beam mode filter, can solve the problems of reducing the beam quality of the output port, increasing the ohmic loss of the over-mode waveguide transmission line, and being difficult to meet the application standards.

Active Publication Date: 2019-08-13
PEKING UNIV
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Problems solved by technology

Usually, the beam radiated by the Vlasov transmitter is not an ideal Gaussian beam, and the over-modulated waveguide transmission line requires precise excitation mode. Lowering the bar for hard-to-reach applications

Method used

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  • A Gaussian beam mode filter with a diagonal horn structure and its realization method
  • A Gaussian beam mode filter with a diagonal horn structure and its realization method
  • A Gaussian beam mode filter with a diagonal horn structure and its realization method

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Embodiment Construction

[0047] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0048] Such as figure 1 As shown, the Gaussian beam mode filter with a diagonal horn structure in this embodiment includes: a first corrugated horn, a transition section waveguide and a second corrugated horn.

[0049] In this embodiment, two identical corrugated horns are connected back-to-back by a transition section waveguide, the Gaussian beam propagates along the z direction, the working frequency is 224GHZ, and the curved surface profile of the horn adopts sin 2 type, the expression of its radius a(z) changing with the distance z is Oral radius a o = 3mm, back radius a i =0.65mm, in order to reduce the reflection caused by impedance mismatch, the groove depth of the corrugated groove changes with the radius, and the radius of the horn is a j place, groove depth d j The expression is This embodiment adopts the commercial elect...

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Abstract

The present invention discloses a Gaussian beam mode filter with a diagonal horn structure and an implementation method thereof. The Gaussian beam mode filter with the diagonal horn structure is designed on the basis of a characteristic that a corrugated horn can generate high-purity hybrid HE11 modes and the principle of antenna reciprocity; when undesired Gaussian beams radiated from an gyrotron output window pass through a first corrugated horn, only a single TE11 mode passes the first corrugated horn; the TE11 mode is subjected to mode conversion of a second corrugated horn, so that highly-pure mixed HE11 modes are generated; and the highly-pure mixed HE11 modes are finally fed into an overmoded waveguide transmission line. With the Gaussian beam mode filter with the diagonal horn structure and the implementation method thereof of the invention adopted, the problem of undesired Gaussian modes of quasi-optical transmission can be solved, the purity of Gaussian modes fed into the transmission line can be effectively improved, and therefore, the high-efficiency transmission of terahertz waves can be realized.

Description

technical field [0001] The invention relates to the field of microwave devices, in particular to a Gaussian beam mode filter with a diagonal horn structure and a realization method thereof. Background technique [0002] As one of the radiation sources with the highest output power in the terahertz frequency band, gyrotrons are widely used as terahertz sources for electron cyclotron heating (ECRH), electron cyclotron diagnostics (ECD), and medical dynamic nuclear magnetic resonance (DNP-NMR). Electron cyclotron maser device is a fast wave device based on the mechanism of stimulated emission of electron cyclotron resonance in a longitudinal magnetic field. With the development of terahertz gyrotrons towards high power and high frequency, in order to improve the power capacity of the cavity and reduce the ohmic loss, the working mode of the gyrotron is usually a high-order mode. There is often a long transmission distance between the gyrotron and the application device, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/16H01P1/20H01P11/00
CPCH01P1/16H01P1/20H01P11/00H01P11/007
Inventor 蒲鸿刘濮鲲杜朝海
Owner PEKING UNIV
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