Connected Transmission Lines Research Articles

Microstrip-Franklin Antenna

Phasing stubs are employed to achieve a cophase current distribution in microstrip rectangular patch arrays. This technique, originally proposed for resonant long wire antennas by Franklin, avoids spurious radiation from half-wavelength connecting transmission lines as used in conventional patch antenna arrays. A slot-radiator model is derived to describe the basic radiation mechanism of the resultant new type of antenna and experimental results for the slot radiation resistance are given. The design of a 13-element resonant array for 12 GHz is presented together with measured radiation patterns.

Resonant Overvoltages in EHV Transformers-Modeling and Application

Resonant overvoltages in EHV transformers initiated by events on connected transmission lines have been experienced.

A Diplexer Using Hybrid Junctions

A diplexer is a filter which connects a transmitter and a receiver to a common antenna so that both the transmitter and the receiver may be operated simultaneously when their frequencies are not identical. The diplexer described in this report uses hybrid junctions, is easily tuned, and can be designed in a simple, straight-forward manner. Its maximum power-handling capacity is the same as that of the connecting transmission line, and its insertion loss is unusually low. An analysis of this filter and a long-stub filter is presented, in addition to the design procedure for, and the experimental results obtained with, a specific model.

Protection of Large Steam Turbine-Generator Units on TVA System

This paper describes the relay protection applied by TVA to large steam turbine-generator units, including the main power transformer and its connections. The basic philosophy underlying relay applications is given, and the interrelations between generator protective relays and those on the station equipment and connecting transmission lines are included. The relation of protection to generator types is shown, and the performance record of the protective relay is presented for electrical faults that have occurred on the TVA system's 50 steam units, ranging in size from 125- to 700-MW capability. Practices relating to the electrical transmission system and those differing from conventional ones are emphasized. The mechanical protection afforded for the steam generator and steam turbine and their appurtenances required for unit operation is described.