DESIGN & FABRICATION OF COAXIAL AND STRIPLINE DIRECTIONAL COUPLERS

Abstract

boot coo-oloped. any of these wore originally d elopcd in ra.vv guide a oroion but are now eitenei' ely ucod In strip line and coaxiol forrs4 Tho loot two forme h been developed aro recently and hem the corbinod ad'zntago of small size and wol ght, Constructional tochniquoo and ham wide bond width (in Many c-. oe)n. t, direct1oncii Coupler is a. matched four port do" 4e i which a signal applied at any one port appears at two other portEr but not at the jlourth, Such de 4coc are r de by introducing some form of oupiin between two transmission lines, The coupling . occur at one discrete point along the length of the line, at aeieral points or continuously (particularly in the case of strip in syotomo), Two directional couplers be been designed ,p follow 14 Coaxial directional coupler with G db coupling in the ban 1,? 0 2,1 G 2V Stripline directional cupler with 20 db coupling in theband 4.8 G (with two twos of tsltions between t or nt floe coupling sections), Also experimental studies ham been carried out in cave of Cixial directional coupler,. to study the ettect of exponential coupling, extending the bend of operation to X band, Satisfactory results have been achieved In both the cases. In future the work could be extended to UIC's and particularly on 3 db branch line coupler in J band using fliC