WT4 Millimeter Waveguide System: The WT4/WT4A Millimeter-Wave Transmission System

Alsberg, D. A.; Bankert, J. C.; Hutchison, P. T.

doi:10.1002/j.1538-7305.1977.tb00158.x

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…The circular waveguide in the WT4 system has an inside diameter of 60 mm, 4 which corresponds to a cutoff frequency of 6.09 GHz. It can be shown that the waveguide introduces considerable dispersion in the WT4 signal.…”

Section: Major Delay Equalization Of the Waveguidementioning

confidence: 99%

WT4 Millimeter Waveguide System: Line and Repeater Equalization

Brown¹,

Brostrup-Jensen²,

Schottle³

et al. 1977

Bell System Technical Journal

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The WT4 millimeter waveguide system requires equalization of the loss and delay of the line, which is made up of both the waveguide itself and the diplexer (waveguide channelizing filter) arrays. In the lower portion of the band (40 to 60 GHz) there is considerable linear delay (as much as 30.5 nsec per 400 MHz at 40 GHz), which is equalized by using a folded tape meander line delay equalizer. The remaining delay and amplitude deviation from the desired transfer characteristic is further reduced by field-adjustable trim equalizers. In this paper, we describe the equalization and measurement philosophy for the WT4 system and also the technologies used in achieving the resulting degree of equalization.We put special emphasis on the description of trim equalization because line equalization has been described in detail in a previous publication.1

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Section: Major Delay Equalization Of the Waveguidementioning

confidence: 99%

WT4 Millimeter Waveguide System: Line and Repeater Equalization

Brown¹,

Brostrup-Jensen²,

Schottle³

et al. 1977

Bell System Technical Journal

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“…My second example involves stress relaxation resulting from inhomogeneous plastic deformation developed during fabricatiou of low carbon steel tubing used for millimeter waveguides (8). The high capacity transmission potential of such tubes depends critically on their right circular cylindrical geometry.…”

mentioning

confidence: 99%

Effect of Temperature on Stress Relaxation of Several Metallic Materials

Fox¹

1982

Residual Stress and Stress Relaxation

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07974The effect of temperature on the stress relaxation characteristics of a number of metals is reviewed. Stress-relaxation behavior is shown to be much more sensitive to change~ in temperature than to changes in the applied stress. It is shown that heat treatment will minimize stress relaxation by either reducing residual stress or by inducing strengthening mechanisms such as age hardening. In some alloy systems stress relaxation may proceed simultaneously with metallurgical processes which may affect the experimental results.

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Measurement of Echoes Due to Spurious TE_OnModes in a Long-Distance 60-mm Waveguide Communication System

Doane¹

1978

Bell System Technical Journal

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To estimate the seriousness of spurious te0n mode generation in a long‐distance millimeter waveguide communication system requires a measurement of small echoes in the impulse response with delays up to about 500 ns. We report the results of such a measurement made as part of a recent 14‐km field test of the wt4 communication system with a novel test set operating near 41 GHz. The results show that the wt4 system can perform satisfactorily without any filters of spurious te0n modes.

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WT4 Millimeter Waveguide System: The WT4/WT4A Millimeter-Wave Transmission System

Abstract: The WT4/WT4A millimeter‐wave, long‐haul transmission system is described. The description includes overall characteristics of the various system components, their interrelationship, and performance. Results of the field evaluation test are summarized.

Cited by 9 publications

References 5 publications

WT4 Millimeter Waveguide System: Line and Repeater Equalization

WT4 Millimeter Waveguide System: Line and Repeater Equalization

Effect of Temperature on Stress Relaxation of Several Metallic Materials

Measurement of Echoes Due to Spurious TE_OnModes in a Long-Distance 60-mm Waveguide Communication System

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WT4 Millimeter Waveguide System: The WT4/WT4A Millimeter-Wave Transmission System

Abstract: The WT4/WT4A millimeter‐wave, long‐haul transmission system is described. The description includes overall characteristics of the various system components, their interrelationship, and performance. Results of the field evaluation test are summarized.

Cited by 9 publications

References 5 publications

WT4 Millimeter Waveguide System: Line and Repeater Equalization

WT4 Millimeter Waveguide System: Line and Repeater Equalization

Effect of Temperature on Stress Relaxation of Several Metallic Materials

Measurement of Echoes Due to Spurious TEOnModes in a Long-Distance 60-mm Waveguide Communication System

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Measurement of Echoes Due to Spurious TE_OnModes in a Long-Distance 60-mm Waveguide Communication System