закладки (спрятать)69
- niaturization occurs
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- This paper treats the old problem of defining and understanding stored electromagnetic energy. Three different concepts for evaluating the stored energy and the radiation Q factor of an antenna are introduced. The first two use time harmonic quantities and are based on the work of Vandenbosch and Yaghjian. The third concept is a time-domain method which aims to deliver the true stored energy. The concepts are discussed and compared on the basis of examples of varying complexity, including evaluation of Q factors for non-radiating lumped RLC circuits and a canonical dipole radiator. It is shown that all three concepts unite for special cases of parallel and series RLC circuits. For other (even very simple) circuits, the approaches yield significantly different results.
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- The scattering from a thin conducting wire is computed by representing the induced current as a sum of driven and resonant terms, the latter with complex propagation constant mk perturbed from its free space value k. Using Galerkin’s method, the central problem of determining m reduces to a minimization problem. For the limiting cases of highly conducting or highly absorbing wires simplifications are found. For short wires the Rayleigh cross sections are obtained; for longer wires with high absorption, accurate cross section formulas are constructed based on the unperturbed infinite wire currents. For general wire lengths and conductivities the method is computationally very simple and results are in excellent agreement with independent computations of both current and far field quantities, as well as experimental measurements.
публикации (спрятать)129
- 2014 IEEE MTT-S International Microwave Symposium (IMS), стр. 1-4. (июня 2014)
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- Prog. Electromagn. Res., (2014)
- ANZIAM Journal, 54 (SUPPL): C446-C458 (2012)
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- IEEE Trans. Antennas Propag., 53 (1): 8-17 (января 2005)
- IEEE press New York, (1998)
- IEEE Antennas Wirel. Propag. Lett., (2014)
- IEEE Trans. Antennas Propag., 57 (4): 1018-1026 (апреля 2009)
- IEEE Trans. Antennas Propag., 62 (1): 311-318 (января 2014)
- Int. J. Microw. Wirel. Technol., 6 (Special Issue 01): 45--50 (февраля 2014)
- IEEE Trans. Antennas Propag., 62 (3): 1304-1311 (марта 2014)
- IEEE Trans. Antennas Propag., 53 (9): 2843--289 (сентября 2005)
- IEEE Trans. Antennas Propag., 12 (1): 23--27 (января 1964)
- IEEE Trans. Antennas Propag., 60 (10): 4556--4567 (октября 2012)
- IEEE Trans. Antennas Propag., PP (99): 1-1 (2014)
- IEEE Trans. Antennas Propag., 31 (2): 364-367 (марта 1983)
