High-frequency coaxial cables. Using the hybrid TEM-dual surface wave to improve transmission characteristics

The stage now seems set for developing h.f. coaxial cables whose attenuation is significantly reduced by employing a hybrid wave instead of the usual TEM mode. Owing to the complexity of design calculations made from the basic equations, it seemed desirable to attempt a simplified analysis, sufficient to give a first approach to the problems of determining the parameters required in any given case. The paper gives details of the approximate expressions so derived and illustrates their application to particular examples.