A set of integro-differential equations, called the “complete circuit equations,” are derived from Maxwell's equations and applied to the solution of the parallel-wire transmission line, the double-helix transmi...
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A new circle diagram is presented for systems having an isolated single resonant mode, in addition to frequency-insensitive structures of arbitrary complexities, and ending in an outgoing wave guide or other transmiss...
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A new circle diagram is presented for systems having an isolated single resonant mode, in addition to frequency-insensitive structures of arbitrary complexities, and ending in an outgoing wave guide or other transmission line. The diagram is obtained from standing-wave measurements in the outgoing line performed at three or more frequencies near resonance. The diagram permits the mapping, in the complex plane of load impedances or reflection coefficients, of such contour lines as loaded-resonator Q, frequency pulling, and the circuit efficiency when the resonator is electronically excited. The proof of these relations, as given in Part II (to be published in a subsequent issue), rests on field theory and establishes in effect the use of general circuit methods in the realm of microwave applications.
The objectives of this and the companion papers following are to introduce and explain new concepts for the design of transmission line circuits which will theoretically provide frequency-independent performance. All ...
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The objectives of this and the companion papers following are to introduce and explain new concepts for the design of transmission line circuits which will theoretically provide frequency-independent performance. All of the circuits are constructed according to log-periodic design principles. As with the corresponding log-periodic antennas, these circuits may be designed to give essentially frequency-independent performance over any desired finite bandwidth. Particularly useful circuits to be described are three-port constant phase difference circuits and four-port hybrids.
When using a uniform ladder network to simulate a smooth transmission line, the possibility is considered of deriving a termination which would be intermediate between the usual mid-shunt and mid-series types and whic...
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A unique new type of RF ammeter is described. The ammeter combines broad frequency coverage with broad current range and is designed for use in a 50-ohm coaxial transmission line. The ammeter consists of an elliptic-c...
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A unique new type of RF ammeter is described. The ammeter combines broad frequency coverage with broad current range and is designed for use in a 50-ohm coaxial transmission line. The ammeter consists of an elliptic-cylinder silver reflector of infrared energy with a cylindrical thick-film heater along one focus and a heat-sensing thermopile along the other focus. Advantages over older ammeter designs include a shielded construction with inherent electrical isolation between the RF and dc circuits, a large dc output (approximately 1-100 mV) corresponding to a decade dynamic range (0.25-2.5 amperes), and a frequency range from dc to about 1 GHz. This coaxial ammeter is believed to be the first to have very low standing-wave ratio (SWR) (1.03) in a 50-ohm transmission line. Ammeters of lower current range can be built, but at a penalty of increased SWR due to the larger heater resistance required.
The paper describes operating conditions on the 150,000-volt transmission line of the Pacific Light and Power Corporation which delivers power from the Big Creek hydroelectric development to Los Angeles, Cal., 240 mil...
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The paper describes operating conditions on the 150,000-volt transmission line of the Pacific Light and Power Corporation which delivers power from the Big Creek hydroelectric development to Los Angeles, Cal., 240 miles away. In daily operation 60,000 kw. are generated, utilizing a total hydraulic head of 4000 ft., in two steps. Plans for the future contemplate the building of two more power houses, operating under somewhat lower heads. Of particular interest is the complete success of the constant potential system, i. e., operation at the same voltage at the generating and receiving stations, by means of synchronous condensers at the receiving end, in conjunction with automatic voltage regulators, one for each condenser as well as for the generators at each of the power houses. The line has been operated with unusual freedom from short circuits. Appendixes describe the development of the system, and give data relating to the equipment of the Big Creek transmission line. Copyright 1914. By A.I.E.E.
A microwave interferometer for the measurement of instantaneous frequency is described. It consists of a transmission line circuit used as a frequency modulation discriminator, and an indicator consisting of a microwa...
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A microwave interferometer for the measurement of instantaneous frequency is described. It consists of a transmission line circuit used as a frequency modulation discriminator, and an indicator consisting of a microwave detector, video amplifier, and oscilloscope. The discriminator transforms the frequency variation during rf pulses, or that of continuous waves, to an amplitude variation at the input of the indicator. The characteristics of the discriminator are investigated theoretically and conditions are discussed for adjustment of the discriminator in order to minimize linear and nonlinear distortions. Since amplitude deviations of the input wave will simulate frequency variations, a technique which greatly reduces this effect is presented. Analysis and experiments indicate that this method provides a practical technique for measuring the frequency and its stability during a radar pulse.
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