By Warren L. Stutzman, Gary A. Thiele
Stutzman's third variation of Antenna idea and Design offers a extra pedagogical procedure with a better emphasis on computational tools. New positive aspects contain extra glossy fabric to make the textual content extra interesting and proper to practising engineers; new chapters on platforms, low-profile components and base station antennas; organizational alterations to enhance knowing; extra info to chose vital issues comparable to microstrip antennas and arrays; and extended measurements topic.
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Additional info for Antenna Theory and Design (3rd Edition)
Sample text
Table 1-2 summarizes the electromagnetic spectrum showing common frequency bands and the corresponding wavelength values; more details on the spectrum are found in Appendix A. Conventional circuits that are smaller than 1 meter in extent, for example, are much smaller than a wavelength in size for operating frequencies up to many MHz and thus do not radiate. Conventional circuit analysis uses a lumped element model where the elements (resistors, capacitors, and inductors) are assumed to have all fields confined to the element extent.
Pelosi, “The Birth of the Term Microwaves,” Proceedings of IEEE, Vol. 84, p. 326, Feb. 1996. 19. E. K. Miller, “The Incremental Far Field and Degrees of Freedom of the Sinusoidal Current Filament,” IEEE Trans. Ant. and Prop. , Vol. 49, pp. 13–20, Aug. 2007. 20. H. E. Green, “A Comment on Charge Motion on a Dipole Antenna,” IEEE Trans. Ant. and Prop. , Vol. 50, pp. 174–175, Aug. 2008. 3-1 Show that the decay of power density for a wave radiated by an antenna (1/r2) results from the increase in the area of a sphere centered on the antenna and the fact that the total radiated power is conserved.
This section is a concise review of material treated in electromagnetic fields courses in electrical engineering or physics. Any basic electromagnetics textbook can be consulted for more details. The fundamental electromagnetic equations in the time domain are1 ∇3E ¼ À @B @t @ D þ IT @t ∇ D ¼ ρT ðtÞ ∇3H ¼ ∇B¼0 ∇ IT ¼ À 1 ð2-1Þ ð2-2Þ ð2-3Þ ð2-4Þ @ ρ ðtÞ @t T ð2-5Þ Time-varying quantities will be denoted with script quantities, for example, E ¼ Eðx, y, z, tÞ. 23 c02 7 April 2012; 8:41:45 24 Chapter 2 Antenna Fundamentals The first four of these differential equations are frequently referred to as Maxwell’s equations and the last as the continuity equation.