Upper Bound on Antenna Gain and Its Reachability

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F24%3A00375961" target="_blank" >RIV/68407700:21230/24:00375961 - isvavai.cz</a>

Výsledek na webu

<a href="https://mrw2024.org/keynote-speakers/" target="_blank" >https://mrw2024.org/keynote-speakers/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Upper Bound on Antenna Gain and Its Reachability

Popis výsledku v původním jazyce

Antenna gain, as a product of radiation efficiency and antenna directivity, is a crucial design parameter with its role even more pronounced in modern and future high-frequency applications, including automotive radars and 6G. As such, the question of its upper bound will be thoroughly addressed in this talk. Starting with the classical works of Uzkov, Bouwkamp, and Harrington and moving forward to recent advanced computational schemes based on modal theory and quadratic programming, it will be demonstrated that the upper bound for antenna gain of a fixed polarization has some unique numerical properties, making it possible to express the solution semi-analytically. The interplay between the electrical size of an antenna, material losses, and bandwidth will be discussed in detail, indicating that all these effects are closely interconnected. The difference between high-directivity (super-directivity) and high-gain (super-gain) will be demonstrated, and the optimal current densities for various antenna design regions will be shown. Considering the excitation of an antenna, i.e., possible mismatch, realized gain is another metric to be optimized. Ways to establish realized gain for multiport antennas and arrays and to identify available degrees of freedom for effective antenna design, in addition to their simultaneous optimization, will be discussed. The talk will conclude with a discussion of open problems and future challenges.

Název v anglickém jazyce

Upper Bound on Antenna Gain and Its Reachability

Popis výsledku anglicky

Antenna gain, as a product of radiation efficiency and antenna directivity, is a crucial design parameter with its role even more pronounced in modern and future high-frequency applications, including automotive radars and 6G. As such, the question of its upper bound will be thoroughly addressed in this talk. Starting with the classical works of Uzkov, Bouwkamp, and Harrington and moving forward to recent advanced computational schemes based on modal theory and quadratic programming, it will be demonstrated that the upper bound for antenna gain of a fixed polarization has some unique numerical properties, making it possible to express the solution semi-analytically. The interplay between the electrical size of an antenna, material losses, and bandwidth will be discussed in detail, indicating that all these effects are closely interconnected. The difference between high-directivity (super-directivity) and high-gain (super-gain) will be demonstrated, and the optimal current densities for various antenna design regions will be shown. Considering the excitation of an antenna, i.e., possible mismatch, realized gain is another metric to be optimized. Ways to establish realized gain for multiport antennas and arrays and to identify available degrees of freedom for effective antenna design, in addition to their simultaneous optimization, will be discussed. The talk will conclude with a discussion of open problems and future challenges.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

<a href="/cs/project/GM21-19025M" target="_blank" >GM21-19025M: Optimální návrh v elektromagnetismu založený na lokální perturbaci přesných modelů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů