Basic Concepts, Definitions and Some Thoughts for Further Research
with an Application to the Improved Study
of Radial Discone
| JOURNAL / ISSUES ISSN 2310-6697 / ISSN-L 2310-6697 |
| open transactions on independent scientific-engineering research |
| FUNKTECHNIKPLUS # JOURNAL |
| Théorie-Expérimentation-Métrologie-Logiciel-Applications |
| ISSUE 35 - MONDAY 30 SEPTEMBER 2024 - YEAR 12 - PERIOD B' |
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| PAPERS |
| Attribution 4.0 International License CC BY 4.0 |
| 35-1 |
| # Electrical Engineering - Théorie |
| Partial Discharges in Solid Insulation Cavities: Basic Concepts, Definitions and Some Thoughts for Further Research |
| M. G. Danikas, R. Sarathi |
| ABSTRACT |
| This paper refers to some basic definitions of partial discharges (PD), a most important phenomenon taking place in insulating materials under high voltages. There is a brief description of PD modeling as well as a description of the means of detecting and registering such phenomena. This paper concentrates mainly on the PD phenomena taking place in enclosed cavities in solid insulation. Some directions of future research are discussed. |
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| 35-2 |
| # Telecommunications Engineering - Application |
| The Overall Antenna Bandwidth with an Application to the Improved Study of Radial Discone |
| N. I. Yannopoulou, P. E. Zimourtopoulos |
| ABSTRACT |
| Broadband antenna characterization is usually referenced implicitly to SWR bandwidth, which is often reported to have an unrealistically huge value without consideration of any other antenna property. The definition of the Overall Antenna Bandwidth is introduced in order to generalize the broadband characterization to include simultaneous broadband antenna properties - in our classification: field, circuit, or field-circuit - needed in practical situations. As an application, a radial discone antenna, i.e. a radial outline of the well-known broadband discone, was studied computationally, for its broadband operation improvement. Simulation was performed using the [RichWire] program. To adequately serve UHF non-GPS wireless 50 Ohm applications, normal/tight criteria were imposed on appropriate antenna properties for their value variations. The resulted bandwidths of 4:1 for horizontal directivity/power gain greater than –3dB (field), 6:1 for mismatch loss ML greater than –0.5 dB or SWR less than 2 (circuit), and 4:1 for horizontal radiation intensity greater than –3dB (field-circuit), define a simultaneous broadband operation in 800-3000 MHz. Web animations demonstrate the results of the generalized broadband antenna characterization using the definition of the overall antenna bandwidth. |
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