The electrical conductivities of steel and other candidate materials for shrouds in a beam-waveguide antenna system

Otoshi, T. Y.; Franco, M. M.

doi:10.1109/19.481315

Cited by 17 publications

(17 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 3 shows the comparison of the input impedance as a function of the thickness h simulated with HFSS and obtained using expression (28) and using roots of (13) calculated with a Muller search in the complex plane. Three values of conductivity have been taken (5e7 S/m, 5e4 S/m, 5e3 S/m) in the range measured in [20]. As can be seen, results are in very good agreement.…”

Section: Numerical Resultsmentioning

confidence: 79%

“…Results given in those papers were correct because good conductors were considered. In this paper, the input admittance will be studied widening the range of metals considered, including conductors with conductivity four order of magnitude lower than the one of copper, like low conductivity steel [20]. In the following, the dyadic Green's function of the parallel plate waveguide will be briefly discussed, and a rigorous expression of the input admittance of a coaxial probe radiating into the parallel plate will be calculated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rigorous Closed Form Expressions for the Input Admittance of a Coaxial Probe Radiating Into a Lossy Parallel Plate Waveguide. A Dyadic Green's Function Approach.

Amendola¹,

Angiulli²,

Arnieri³

2013

PIER M

View full text Add to dashboard Cite

In this paper the derivation of a rigorous expression of the input admittance of a coaxially fed, infinite, lossy parallel plate waveguide (PPWG) is presented. The derivation makes use of the dyadic Green's function of the PPWG expressed as series a cylindrical wave-functions. Losses into the dielectric plates and on the conductors are considered rigorously. The approximation used in results presented in the past literature are critically discussed. Numerical experiments are performed to show the effects of the finite conductivity on the input impedance of the PPWG.

show abstract

Section: Numerical Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Rigorous Closed Form Expressions for the Input Admittance of a Coaxial Probe Radiating Into a Lossy Parallel Plate Waveguide. A Dyadic Green's Function Approach.

Amendola¹,

Angiulli²,

Arnieri³

2013

PIER M

View full text Add to dashboard Cite

show abstract

“…Similar examples of lower-than-expected conductivity can be found in [24], where a conductivity of 0.8 MS/m for surface machined cold rolled steel at 24 GHz was reported, for which around 3 MS/m were expected at DC. An example of zinc- plated steel with an apparent 4 MS/m conductivity measured at 8.42 GHz was presented in [47], but no details were given about the zinc thickness and what galvanization technique was used; waves at this frequency would mostly interact with the zinc layer, with a skin depth of about 1.4 µm for pure zinc. Fig.…”

Section: Resultsmentioning

confidence: 99%

Power Dissipation in Reverberation Chamber Metallic Surfaces Based on Ferrous Materials

Cozza

Monsef

2019

IEEE Trans. Electromagn. Compat.

View full text Add to dashboard Cite

Models predicting the composite quality factor (QF) of a reverberation chamber (RC) consider, among several potential contributors, dissipation in its metallic boundaries. The related partial quality factor, Qw, is of fundamental importance, as it controls the asymptotic high-frequency behavior of an RC and, ultimately, its ability to generate high-intensity fields. Yet, the current model has been known to overestimate in certain cases the composite QF by up to several dB. This paper provides insight into the causes of these disagreements by introducing generalized models of dissipation in ferrous materials found in RCs, by first acknowledging that their magnetic permeabilities are complex quantities, which is shown to theoretically boost dissipation well beyond the GHz range. A more general dissipation model is presented, taking into account the layered nature of steel plates. Among its predictions, confirmed by experiments, are extra losses from steel surfaces in the lower frequency range and the linear increase in Qw over the GHz range, as opposed to a squareroot dependence expected for homogeneous bulk metals. Metallic coating layers, originally introduced to protect steel plates, have therefore a more fundamental role to play, controlling dissipation levels by reducing interactions with ferrous materials and should therefore be designed accordingly.

show abstract

“…(3) ( 1 ) 0° incidence angle was obtained through the usc of approximate fOI111Ulas given in [18]. As may be seen from Equation (8), if six mirrors are involved, these noise temperatures for bare-metal mir rors alone were increased by about a factor of six, which is sur prisingly high.…”

Section: Plots As Functions Of Incidence Anglementioning

confidence: 99%

“…The noise-temperature and gain-loss values for 6061-T6 alumimull were based on an electrical conductivity of 2.3 x 10 7 mhos/m[18]. FromFigure Sa, it can be seen that, at 00 incidence angle, the noise temperature, T;" of 6061-T6 aluminum was 0.23 K, and the bare-metal gain loss was 0.0034 dB.…”

mentioning

confidence: 99%

Noise temperature and gain loss due to paints and primers: a case study of DSN antennas

Otoshi

Rahmat-Samil²,

Cirillo

et al. 2001

IEEE Antennas Propag. Mag.

Self Cite

View full text Add to dashboard Cite

In achieving high performance for reflector antennas, it has been noted that it is essential to carefully assess the roles of sur face paints and primers. A thorough literature search has revealed that not much has been reported on this very important engineering-implementation topic. It is one of the main objectives of this feature article to provide a detailed study on the effects of paints and primers on reflector-antenna performance. In particular, as a case study, this paper presents excess noise-temperature and added-gain loss data at 32 GHz for various combinations of paints and primers currently being studied for use on DSN (Deep Space Network) antenna reflector surfaces. It is shown that 500FHR6 acrylic urethane-based paint has the lowest excess-noise-temperature contribution. Recently, it has been recommended that this paint be used for all new DSN beam-waveguide antennas being constructed, and for all those 34-m and 70-m antennas with reflector surfaces that need repainting. The results, methodologies, and observations presented in this article are also applicable to other reflector antenna configurations.

show abstract

The electrical conductivities of steel and other candidate materials for shrouds in a beam-waveguide antenna system

Cited by 17 publications

References 5 publications

Rigorous Closed Form Expressions for the Input Admittance of a Coaxial Probe Radiating Into a Lossy Parallel Plate Waveguide. A Dyadic Green's Function Approach.

Rigorous Closed Form Expressions for the Input Admittance of a Coaxial Probe Radiating Into a Lossy Parallel Plate Waveguide. A Dyadic Green's Function Approach.

Power Dissipation in Reverberation Chamber Metallic Surfaces Based on Ferrous Materials

Noise temperature and gain loss due to paints and primers: a case study of DSN antennas

Contact Info

Product

Resources

About