Dielectric line and production method therefor

Abstract

A dielectric line having a sufficient ensured strength and being suitable for mass production and a production method therefor are provided. The production method is a method for manufacturing a dielectric line having a dielectric strip which is provided between two conductive plates approximately parallel to each other and which has a width smaller than that of the conductive plates, and dielectric medium layers which are filled between the conductive plates other than the dielectric strip and which is composed of a porous material having a dielectric constant smaller than that of the dielectric strip. The dielectric line (NRD guide) is produced by film forming steps S 11 and S 12 in which a film of a dielectric raw material is formed on one of the conductive plates, a strip exposure step S 13 in which a part of the above film having a shape corresponding to the dielectric strip is exposed to predetermined light, beams, or vapor, and pore forming steps S 15 and S 16 in which the entire film of the dielectric raw material is made porous.

1 . A dielectric line comprising: a dielectric strip provided between two conductive plates approximately parallel to each other and having a width smaller than that of the conductive plates,
 wherein the dielectric strip is composed of a porous material, and   the other parts between the two conductive plates other than the dielectric strip are filled with dielectric medium layers composed of a porous material having a dielectric constant smaller than that of the dielectric strip.   
   
   
       2 . The dielectric line according to  claim 1 , wherein the dielectric strip and the dielectric medium layers are composed of a substantially identical material and have different porosities from each other. 
   
   
       3 . The dielectric line according to  claim 1 , wherein the distance between the two conductive plates is one-half or less the wavelength of a signal in the dielectric medium layers, the signal being transmitted through the dielectric line. 
   
   
       4 . The dielectric line according to  claim 1 , wherein the dielectric strip and the dielectric medium layers are composed of an aerogel material.