Resonant Lines in Radio Circuits

Resonant transmission lines may be used as circuit elements in the ultra-short wave range as a means of obtaining high impedance with low loss. The lines may be of either concentric tubes or 2 wires, and are sufficiently small that they may be placed within the apparatus. These circuits can be made highly selective, and when used to control oscillator frequency will give stability comparable to that of a crystal. The mathematical relations governing their operation and several applications are discussed in this paper.