Electrical parameters of precision, coaxial, air-dielectric transmission lines

Nelson, Robert C.; Coryell, Marlene R.

doi:10.6028/nbs.mono.96

Cited by 24 publications

(13 citation statements)

References 2 publications

(2 reference statements)

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“…According to the transmission line equation of an ideal lossless air line , when the frequency of a sine‐wave signal impressed on the air line is f (Hz) (angular frequency ω = 2π f [rad/s]), inductance per unit length (H/m) can be calculated from the ratio of A and B and the magnetic permeability μ (H/m). Thus, the inductance of the air line is determined by the diameter ratio and the internal and external conductor lengths.…”

Section: Fundamentalsmentioning

confidence: 99%

Development of inductance reference standard using coaxial transmission lines

Domae

Horibe

2019

IEEJ Transactions Elec Engng

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The National Metrology Institute of Japan is developing a reference inductance standard using air dielectric coaxial transmission lines that can be used up to the gigahertz range. In this paper, inductance determination steps for a lossy air line were presented. In addition, a verification procedure by comparing electrically determined length le and measurement‐determined length lm was considered. In practice, the inductances of a 60‐mm‐long air line are determined and verified at the measurement frequency from 0.05 to 10 GHz. No significant difference was observed between le and lm. Therefore, the determined inductances from 0.05 to 10 GHz were considered verified. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Fundamentalsmentioning

confidence: 99%

Development of inductance reference standard using coaxial transmission lines

Domae

Horibe

2019

IEEJ Transactions Elec Engng

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“…In view of the uncertainty in the physical dimensions of the conductors, Stratton's approximations are quite satisfactory above 1 MHz [19].…”

Section: A Characteristics Of Coaxial Air-spaced Linesmentioning

confidence: 98%

Impedance measurements in coaxial waveguide systems

Jesch

Jickling

1967

Proc. IEEE

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A l s t r a c t -W article is a tstoripl review of impednnee measureauzats dstfadudsiacoaxidwavegmidesystesmpropagathgaTEMwave.It d e s m i b e s t b e d e v e h p m e n t o f c o a x i a l a i r k a s~s t . n d n & , r ev k v s r~t i v e m e a m r e m e d m e t b o & d~& e e r r o r s a n d nreosrwmeptt~oftBeslottedlioemdet.il. A I. INTRODUCTIONCCURACIES of impedance measurements in waveguide of coaxial cross section have been improved by a factor of ten in less than two decades, an achievement based primarily on the parallel development of precision coaxial-line standards and precision coaxial connectors.' The development of these coaxial-line standards and their contribution toward improved impedancemeasurement systems will be reviewed in this paper. Improvements in bridge, slotted-line, and reflectometer measurement techniques that have taken place during this same period would not have been accomplished without concurrent improvements in precision connectors. These connectors have extremely low VSWR's and provide well defined reference planes.To give some background on the early development of coaxial impedance measurements, the basic methods and techniques will be mentioned. These start with the method of measuring impedances by the use of slotted lines [ 1 ]- [3]. A single fixed probe can also be used by separating the probe from the load by a length of line containing a variable phase shifter allowing one to observe the standing-wave pattern [4] as it sweeps past the probe. Reflectometer systems using directional couplers [5] and hybrid junctions [ 6 ] , operated at a single frequency, provide a way to measure the amplitude of reflection coefficient, but often without information about relative phases of the two traveling waves. Reflectometers operating at single frequencies are described by Beatty [7]. New methods employing swept-frequency techniques, described by Ely [54], can be used to obtain the amplitude and the phase of microwave parameters.

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“…The null bridge method was adapted to a system in which the phase-shift changes rapidly, namely, through a plasma. The system was capable of measuring a 0.003 ø phase shift at 9 GHz [Gardner, 1966] [Zorzy, 1966], and electrical parameters of coaxial lines were calculated and graphed [Nelson and Coryell, 1966].…”

Section: Rw Beatty Editormentioning

confidence: 99%