Monolithic millimeter-wave integrated circuits have been designed and fabricated on semi-insulating GaAs substrates using microstrip transmission lines. circuits using hybrid techniques have also been constructed on q...
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Monolithic millimeter-wave integrated circuits have been designed and fabricated on semi-insulating GaAs substrates using microstrip transmission lines. circuits using hybrid techniques have also been constructed on quartz and ceramics. This paper shows that microstrip-line integrated circuits are feasible at millimeter-wave frequencies. Circuit functions have been constructed and tested in the 25- to 100-GHZ range. The loss in microstrip line on semi-insulating GaAs was found to be less than 0.3 dB//lambda/. Couplers from waveguide to microstrip have been made with transmission losses less than 0.5 dB. Monolithic integrated detectors showed 5-dB better sensitivity than a 1N53 diode in a Philips detector mount. Monolithic diodes delivered 1.5 mW at 28 GHz. The results are encouraging and a fully monolithic integrated receiver is under development.
At a given frequency, a lossless discontinuity on a transmission line may be represented by an equivalent circuit consisting of an ideal transformer and two lengths of transmission line.
At a given frequency, a lossless discontinuity on a transmission line may be represented by an equivalent circuit consisting of an ideal transformer and two lengths of transmission line.
The Relay Subcommittee of the Protective Devices Committee herewith submits its recommendations for the protection of electrical apparatus. These recommendations are based upon a questionnaire and the thirty-seven rep...
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The Relay Subcommittee of the Protective Devices Committee herewith submits its recommendations for the protection of electrical apparatus. These recommendations are based upon a questionnaire and the thirty-seven replies thereto from specialists in this line. The answers were interpreted and codified by a group of twenty experienced engineers particularly interested in the protection of electrical apparatus and circuits. It is hoped that this consensus of the present-day opinion will be the beginning of a series that will be augmented and improved with each periodic analysis and reissue. Copyright 1933. By A. I. E. E.
A method of determining voltage levels due to energizing or reclosing EHV transmission lines by using traveling phasor concepts is described. The major advantage over previously described methods is economy in computa...
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A method of determining voltage levels due to energizing or reclosing EHV transmission lines by using traveling phasor concepts is described. The major advantage over previously described methods is economy in computation since the energizing phase need not be varied. Comparisons with field tests and analog results show good agreement.
An important aspect of TEM quarter-wave network synthesis and design is the multiplicity of physical configurations that give identical response characteristics. Different network configurations are often, required to...
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An important aspect of TEM quarter-wave network synthesis and design is the multiplicity of physical configurations that give identical response characteristics. Different network configurations are often, required to realize the same basic response for moderate changes in design parameters because of the small range of realizable impedance values. In most design procedures, practical circuit element values are obtained by application of suitable equivalent circuit relationships. In a previous paper a systematic method of obtaining equivalent circuits using transformations of the static capacitance matrix of a parallel coupled line array was introduced and applied to the exact design of interdigital bandpass filters. These transformations can also be used to give a simple physical interpretation to familiar transmission line identities and can be applied to the design of many TEM microwave devices.
A new method is presented for calculating the charge and potential distribution in shielded microstrip lines with stratified dielectric fillings. The boundary value problem associated with this structure is formulated...
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A new method is presented for calculating the charge and potential distribution in shielded microstrip lines with stratified dielectric fillings. The boundary value problem associated with this structure is formulated in a rigorous manner and the solution is constructed by an extension of the function-theoretic technique. Several advantages of this method are pointed out. The most important of these is its numerical efficiency. Numerical results are presented for charge and potential distributions for several choices of design parameters. The characteristic impedance and the guide wavelength are obtained from the knowledge of the charge distribution. Comparisons are made with the published data and the agreement is found to be very satisfactory.
Fearing tlhat the remarks of some of the speakers may have left an erroneous impression as to the potential of telephone circuits carried on the poles of high-tension transmission lines, I desire to state that some me...
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Fearing tlhat the remarks of some of the speakers may have left an erroneous impression as to the potential of telephone circuits carried on the poles of high-tension transmission lines, I desire to state that some measurements made by a Weston voltmeter between the conductors of a telephone circuit placed five feet below the conductors of a 25,000 volt overhead circuit and ground, showed tlhe potential to be only from 140 to 160 volts. Similar measurements on a telephone circuit three feet below a 10,000 volt line showed only about 95 volts to ground and, naturally, no difference of potential between the telephone conductors. It seems to me that the voltage of a telephone circuit given as 20,000 by Mr. Thomas cannot be such potential as would be indicated by a voltmeter or such as would cause particular damage, being, I assume, simply static potential. Referring to the suggestions made as to signaling in case of partial breakdown of the telephone system, it has occurred to me that as a relay to the telephone circuit, a system of wireless telegraphy could be installed without large expense, which might advantageouslv be used in transmitting signals in case of trouble with tlhe telephone circuit.
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