Fabrication of phased array microwave waveguides windows

Walls, R.; Bernabei, S.; Evans, H.

doi:10.1109/fusion.1989.102208

Cited by 3 publications

(3 citation statements)

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“…The structure is a rectangular waveguide brazed with a dielectric slab whose thickness is λ g /2. The value λ g is the wavelength in the material of the vacuum seal [8][9][10][11][12][13][14][15][16]. The former has the advantage of the reliability of the disk brazing, and has a wide bandwidth.…”

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confidence: 99%

A Multilayer Waveguide Window for Wide-Bandwidth Millimeter Wave Tubes

Lin

2007

Int J Infrared Milli Waves

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A multilayer waveguide window is demonstrated to exhibit wide bandwidth and high transmission for applications in high-frequency microwave tubes. A transfer matrix approach is employed to discretize the dielectric function profile of the multilayer heterostructure in a rectangular waveguide. The closed form has been obtained and the corresponding reflection and transmission characteristics have been carried out. The analytical calculation is also compared with the result of numerical simulation via the finite-element code HFSS. The exact calculation agrees with the numerical simulation very well. By comparison, the approach not only enhances the accuracy and efficiency, but also gives a good criterion for the design. The results show that the bandwidth for a transmission of 99%, i.e., S 11 below -20 dB, can be optimized to be about 8.75 GHz at a central frequency of 35 GHz or about 25%. A wide-bandwidth waveguide window can be easily designed for Ka-band and W-band tubes, and even for higher frequency ones.

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confidence: 99%

A Multilayer Waveguide Window for Wide-Bandwidth Millimeter Wave Tubes

Lin

2007

Int J Infrared Milli Waves

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“…The 24 slots in each of the four units are machined into a single block of Titanium 6242 alloy material. One mill precision for this technique is necessary to permit brazing the vacuum windows (half wavelength resonant bricks of aluminum oxide) directly into the channels without a jig [ 6 ]. The dimensions of each waveguide opening are 60 mm x 5.5 mm and the openings are separated by a 1.5 mm septum.…”

Section: Constructionmentioning

confidence: 99%

A Third Generation Lower Hybrid Coupler

Bernabei¹,

Hosea²,

Kung³

et al. 2001

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“…Other weak points have been the vacuum joints of the waveguide lines: we decided to eliminate both types of potential problems by incorporating the microwave vacuum window in the nose coupler. We already have achieved a high degree of reliability in brazing multiple alumina windows on a Titanium alloy frame [4], for C-Mod we plan to braze the 24 alumina breaks inside the 24 channels, each cut 10 cm deep in a Titanium alloy block via EDM-wire. Not only the electron cyclotron resonance layer will be in a pressurized area, but all the waveguide joint will be as well.…”

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confidence: 99%