Quality factor and absorption bandwidth of electrically small lossy structures
| Autor: | Ofer Markish, Yehuda Leviatan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Lossless compression
Physics business.industry Radiation quality 020208 electrical & electronic engineering Bandwidth (signal processing) 020206 networking & telecommunications Ranging 02 engineering and technology Lossy compression Optics Q factor 0202 electrical engineering electronic engineering information engineering Power absorption Absorption bandwidth Electrical and Electronic Engineering business |
| Zdroj: | IET Microwaves, Antennas & Propagation. 14:101-108 |
| ISSN: | 1751-8733 |
| DOI: | 10.1049/iet-map.2019.0324 |
| Popis: | A new quality factor (Q abs) characterising power absorption by electrically small structures ranging from antennas to lossy objects is defined. In analogy to the radiation quality factor (Q rad), which is evaluated using the antenna radiated fields in transmitting mode, Q abs is evaluated using the fields scattered by the absorbing structure. Similar to the known relationship between the antenna matching bandwidth (B match) and Q rad, it is rigorously shown that for an electrically small lossless receiving antenna Q abs is inversely proportional to the absorption bandwidth (B abs) of the antenna. Based on a circuit model, it is then conjectured that the same B abs–Q abs relation is also valid in the cases of electrically small lossy antennas and objects that do not have terminals. Numerical examples are shown to demonstrate the validity of the presented B abs–Q abs relation. |
| Databáze: | OpenAIRE |
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