Center conductor diagnostic for multipactor detection in inaccessible geometries

2017 ◽  
Vol 88 (1) ◽  
pp. 014706 ◽  
Author(s):  
Vernon H. Chaplin ◽  
Aimee A. Hubble ◽  
Kathryn A. Clements ◽  
Timothy P. Graves
Keyword(s):  
Center Conductor

Polymer-based micromachined rectangular coaxial filters for millimeter-wave applications

2011 ◽  
Vol 3 (2) ◽  
pp. 115-120 ◽  
Author(s):  
Aline Jaimes-Vera ◽  
Ignacio Llamas-Garro ◽  
Maolong Ke ◽  
Yi Wang ◽  
Michael J. Lancaster ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Millimeter Waves ◽  
Return Loss ◽  
Low Cost ◽  
Coplanar Waveguide ◽  
Coaxial Line ◽  
Center Conductor ◽  
Low Cost Manufacturing ◽  
Insertion Losses ◽  
Better Than

In this paper, micromachined devices for millimeter-wave applications at U- and V-bands are presented. These structures are designed using a rectangular coaxial line built of gold-coated SU-8 photoresist layers, where the coaxial center conductor is suspended in air by stubs. The designs include a stepped coplanar waveguide (CPW)-to-coaxial transition at 63 GHz, with an insertion loss of 0.39 dB at 67.75 GHz and a return loss better than −10 dB across the band of operation between 54.7 and 70.3 GHz. Two filters have been designed; one centered at 42 GHz with a 10% bandwidth, and another at 63 GHz with a 5% bandwidth. Measured insertion losses of 0.77 and 2.59 dB were obtained for these filters, respectively. Measured return loss lower than 13.8 dB over the passband was achieved for both designs. The structures presented in this paper involve a low-cost manufacturing process suitable to produce integrated subsystems at millimeter waves.

Thermal-Hydraulic Optimization of Water-Cooled Center Conductor Post for Spherical Tokamaks Reactor

2002 ◽  
Vol 4 (3) ◽  
pp. 1335-1343 ◽  
Author(s):  
Ke Yan ◽  
Wu Yi-can ◽  
Huang Qun-ying ◽  
Zheng Shan-liang
Keyword(s):  
Center Conductor

Reliable Ceramic Window Design for Electronic Devices

1992 ◽  
Vol 114 (3) ◽  
pp. 349-352
Author(s):  
Hsien-Yang Yeh
Keyword(s):  
Traveling Wave ◽  
Electronic Device ◽  
High Vacuum ◽  
Complex Nature ◽  
Circular Plates ◽  
Linear Elastic ◽  
Center Conductor ◽  
Elastic Fracture ◽  
Traveling Wave Tubes ◽  
Window Design

The effective operations of a high voltage vacuum electronic device, such as a traveling wave tube, depends on its ability to maintain high vacuum environments. However, during temperature tests, some tubes fail because of vacuum leaks through cracks in the ceramic window. It is believed that these leaks result from RF heating at the center conductor, which caused the ceramic to crack. To obtain a general understanding of the stress field in the window structure, a closed from analytical approach is imperative. However, due to the complex nature of the problem, only the first order engineering approximation is used in this preliminary study. The theory of linear elastic fracture mechanics and the existing solutions from elastic circular plates are useful for understanding the cause of ceramic window cracks. Some simple design references have also been developed for the design of reliable ceramic windows for traveling wave tubes.

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