Analysis of thesuspended stripin elliptical cross-section by separation of

Fax+39712804334. Abstract Thecoaxial suspended strip configuration inelliptical cross-section isfoundintransitions fromordinary coaxto planar circuits andothergeometries. Usingelliptical coordinates makestheproblem separable andleads toclosed formssolutions forthefundamental TEM modeandthe TEJTMhigher modes: itisemphasized that thepresenceof thethin strip isdealt withanalytically inthis approach. Mode patterns andTEMcharacteristic impedance arereported.The cutoff frequencies vs.excentricity arecomputed forthefirst eight modesbyboththepresent andtheF.E.M. method finding excellent agreement.