The principle upon which the operation of direct-reading wattmeters is based has been known for many years. The contribution of this paper lies in the application of this principle to a practical operating instrument ...
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Electronic tuning of Gunn diodes in hybrid integrated circuits has been studied. Microstrip transmission lines were used to form resonant circuits into which a Gunn diode and a varactor diode were mounted to provide t...
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Electronic tuning of Gunn diodes in hybrid integrated circuits has been studied. Microstrip transmission lines were used to form resonant circuits into which a Gunn diode and a varactor diode were mounted to provide the microwave power and frequency tuning, respectively. Basically, two types of circuits have been investigated. The first is a half-wavelength open-circuited microstrip `cavity' with this transmission line and the varactor diode attached between the end of the cavity and an RF ground. The second is a lumped LC circuit in which the inductance of a short high-impedance microstrip line is resonated with the lumped capacitance of the varactor diode. The latter circuit provides a tuning range of over 10 percent at 7.5 GHz. The power output varies within 2 dB in the tuning range.
A simple tuning circuit for source or load matching is described that makes possible smooth and sensitive adjustments with no “holes” in frequency coverage over a complete waveguide band. Energy is coupled out of th...
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The principal results of this study are shown in Figs. 5-7. The data as presented permit a broad range of application as far as system operating voltages are concerned, since circuit kw loading is expressed in per-uni...
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The principal results of this study are shown in Figs. 5-7. The data as presented permit a broad range of application as far as system operating voltages are concerned, since circuit kw loading is expressed in per-unit of 2.5 (kv)2, where kv is the actual operating voltage in kv at the sending-end of the transmission line. For reference, 1.0 per-unit circuit kw load for several operating voltages is shown in Table I. Approximate economic kvar transmission limits are shown in each figure as a function of circuit kw loading for several transmission distances as well as fox two different values of transformer impedance, i.e., 10 and 15%. For convenience, optimum kvars are expressed as a ratio of kw load received. Figs. 5, 6, and 7 apply to conductor sizes of 1,272-, 636-, and 266.8-MCM ACSR respectively. Also, Figs. 5(A), 6(A), and 7(A) apply to future design cases where differences in transformer kva, generator reactive capacity, and power and energy loss are evaluated. Data for existing facilities, where only energy and power demand differences are considered, are given in Figs. 5(B), 6(B), and 7(B). Indications of the normal peak-load generator power factors and receiving system load-bus voltages which correspond to the economic kvar transmission limits are also given in Figs. 5-7. It should be clear that the load-bus voltages are expressed in per cent as seen from the highvoltage sending-end bus, and reflect the actual operating turns ratio of the receiving-end step-down transformer.
The characteristic impedance and the attenuation of transmission lines supporting a TEM mode can be determined by the following methods: 1 Resistive thin film method (analog computation). 2 Finite difference methods c...
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The characteristic impedance and the attenuation of transmission lines supporting a TEM mode can be determined by the following methods: 1 Resistive thin film method (analog computation). 2 Finite difference methods combined with relaxation technique (digital computation).
Summary form only. An abstract of the above-titled article, taken from the 1963 IEEE International Convention (held March 25-28, New York, NY, USA), is presented.
Summary form only. An abstract of the above-titled article, taken from the 1963 IEEE International Convention (held March 25-28, New York, NY, USA), is presented.
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