公开(公告)号：US5495218A

公开(公告)日：1996-02-27

申请号：US230387

申请日：1994-04-20

申请人： Tom L. Erb ,  Michael H. Fesler ,  Hugh L. Perry, III

发明人： Tom L. Erb ,  Michael H. Fesler ,  Hugh L. Perry, III

IPC分类号： H01P1/08 ,  H01P5/00

CPC分类号： H01P1/08

摘要： A microwave waveguide is presented which includes a gas tight seal which provides pressure isolation between two portions of the waveguide. In accordance with an important feature of this invention, an upper flange includes a threaded axial opening for receiving and retaining a threadably mated dielectric filling material. If the thread pitch is small relative to the signal wavelength, the threaded section has essentially the same electrical characteristics as a smooth waveguide. The resulting structure provides an economical and practical method of retaining a solid dielectric filling material in a waveguide against high pressure without changing the effective diameter of the waveguide. In accordance with another feature of this invention, a novel high pressure seal is provided between the upper and lower flanges in the area surrounding the threaded axial opening. This high pressure seal comprises the capture of a membrane or disk of soft material, preferably polytetrafluoroethylene (PTFE), in an essentially constant volume, closed cavity. The PTFE thus acts like a compressed fluid and provides for high pressure gas operation in hostile environmental conditions with reduced failure relative to prior art PTFE (or like materials) to metal sealing arrangements. In accordance with still another feature of this invention, the sealing membrane or disk described above is rendered thin (on the order of 0.002 to 0.020 inches) and includes outer dimensions which are larger than the outer dimensions of the waveguide. The disk or membrane is thin enough so as not to impact the electrical characteristics of the waveguide.

摘要翻译： 提出了一种微波波导，其包括气体密封，其在波导的两个部分之间提供压力隔离。 根据本发明的重要特征，上凸缘包括用于接收和保持螺纹配合的电介质填充材料的螺纹轴向开口。 如果螺距相对于信号波长较小，则螺纹部分具有与光滑波导基本相同的电特性。 所得到的结构提供了一种在不改变波导的有效直径的情况下将固体电介质填充材料保持在波导中以抵抗高压的经济实用的方法。 根据本发明的另一特征，在围绕螺纹轴向开口的区域中，在上凸缘和下凸缘之间设置有新的高压密封。 该高压密封包括在基本上恒定体积的封闭空腔中捕获软质材料（优选聚四氟乙烯（PTFE））的膜或盘。 因此PTFE因此像压缩流体一样起作用，在恶劣的环境条件下提供高压气体操作，相对于现有技术的PTFE（或类似材料）与金属密封装置相比，具有降低的故障。 根据本发明的另一个特征，上述密封膜或盘变薄（约0.002至0.020英寸），并且包括大于波导的外部尺寸的外部尺寸。 盘或膜足够薄，以免影响波导的电特性。