A parallel plate transmission line circuit has been developed which facilitates rapid testing of experimental TRAPATT diodes. In this circuit the impedance of each tuning element can be continuously varied. This is an...
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A parallel plate transmission line circuit has been developed which facilitates rapid testing of experimental TRAPATT diodes. In this circuit the impedance of each tuning element can be continuously varied. This is an appreciable advantage over conventional coaxial TRAPATT circuits which use fixed diameter slugs.
Physical parallels of transmission lines with communication circuits and railroad signal circuits cause induced voltages which may interfere with normal operation. Due to the demand for more efficient uses of existing...
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A 12-GHz low-noise converter consisting of a planar circuit mounted in waveguide is described. This circuit consists of a metal sheet with proper patterns that is inserted in the middle of a waveguide parallel to the ...
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A 12-GHz low-noise converter consisting of a planar circuit mounted in waveguide is described. This circuit consists of a metal sheet with proper patterns that is inserted in the middle of a waveguide parallel to the E plane. All circuit elements required for the converter are pressed or etched. This circuit is very useful for low-cost mass production and good performance. A measured noise figure of 4.5 dB was obtained with a 12-GHz signal frequency and a 420-MHz intermediate frequency.
The program analyzes and optimizes certain cascaded linear time-invariant networks in the frequency domain made up of two-port elements such as resistors, inductors, capacitors, Iossless transmission lines, lossless s...
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The program analyzes and optimizes certain cascaded linear time-invariant networks in the frequency domain made up of two-port elements such as resistors, inductors, capacitors, Iossless transmission lines, lossless short-circuited, and open-circuited transmission line stubs, series and parallel RLC resonant circuits and microwave allpass C- and D-sections.
A simple but accurate wave transducer has been developed for measuring waves on inland and coastal waters, consisting of a tunnel diode oscillator, using an open transmission line to sense the water-level. The output ...
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A simple but accurate wave transducer has been developed for measuring waves on inland and coastal waters, consisting of a tunnel diode oscillator, using an open transmission line to sense the water-level. The output signal is a pulse train with a period linearly proportional to the length of transmission line above the water surface.
A new principle of Broadband Matching Network in Transmission Line circuits is described which can be used for transformer, coupler and other multistructure applications. In this new design, the distance between succe...
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A new principle of Broadband Matching Network in Transmission Line circuits is described which can be used for transformer, coupler and other multistructure applications. In this new design, the distance between succeeding impedance steps or coupling holes is much smaller than a quarter of a wavelength. This results in a greater number of steps or holes and lower single step reflections for a given coupling function or overall impedance transform ratio. The performance is therefore considerably improved. As an illustrative example, a waveguide directional coupler using the new network principle is shown. This technique can also be used for the development of very wide bandwidth (10:1) components.
The multistrip coupler performs the function of a directional coupler for freely propagating surface acoustic waves on a piezoelectrically active substrate. Its operation is analyzed in terms of a transmission line ba...
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The multistrip coupler performs the function of a directional coupler for freely propagating surface acoustic waves on a piezoelectrically active substrate. Its operation is analyzed in terms of a transmission line based equivalent circuit. Expressions are obtained for the directionality (transmission and reflection) in terms of the number of coupler strips and the acoustic frequency. Theory and experiment are shown to be in very good agreement. 50-percent metallization is found to give optimum performance; progressive increase in the proportion of the coupler area covered with metal is shown to involve a progressive change from an inline field model to a crossed-field model. Outside a stopband region it is found that a simplified expression for the directionality is valid; this greatly facilitates component design. Design criteria for multistrip components are discussed in terms of substrate and bandwidth requirements. An analysis is included of resistive and capacitative effects on coupling, and problems associated with coupling between dissimilar materials are discussed.
Techniques for modeling multiconductor transmission lines for use with the SCEPTRE computer program are presented. The transmission line models developed can be modified for compatibility with other circuit/ system tr...
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Techniques for modeling multiconductor transmission lines for use with the SCEPTRE computer program are presented. The transmission line models developed can be modified for compatibility with other circuit/ system transient analysis programs and are amenable to modification to include nuclear weapon effects. The general modeling approach has been to develop computationally efficient and accurate terminal models which can be arbitrarily loaded at the source and load ends and which can be used in conjunction with nonlinear electronic circuit models using either simplified or discrete modeling techniques. The concept of the method is to derive a set of transfer functions in the Laplace domain relating forward and backward traveling waves on the line to voltages and currents at the source and load ends of the line, approximate the transfer functions with a set of orthonormal polynomials, and represent the resulting rational polynomials in the time domain with state variable differential equations. For the multiconductor case, the orthogonal characteristics of wave propagation are used to decouple the modes of propagation except at the source and load boundary condition circuits.
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