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By Warren L. Stutzman

This advent to antenna thought and layout is acceptable for senior undergraduate and graduate classes at the topic. Its emphasis on either ideas and layout makes it ideal either as a faculty textual content and as a connection with the working towards engineer. ultimate 3 chapters on computational electromagnetics for antennas are compatible for graduate paintings. Stutzman presents extra of a pedagogical technique than its rivals, putting a better emphasis on a concise simply comprehensible presentation of basics and functions in addition to computational tools. This 3rd variation has been thoroughly revised. New subject matters were additional on antennas for private and cellular communications and base station antennas. assurance of platforms purposes of antennas, arrays, microstrip and low-profile antennas, and antenna measurements has been up-to-date and accelerated, together with extra examples utilized to fashionable functions.

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824–829, May 1988. 12. J. H. Bryant, “The First Century of Microwaves—1886 to 1986,” IEEE Trans. on Micro. Th. , Vol. 36, pp. 830–858, May 1988. 13. C. Susskind, “Heinrich Hertz: A Short Life,” IEEE Trans. on Micro. Th. , Vol. 36, pp. 802–805, May 1988. 14. J. Ramsay,“ Microwave Antenna and Waveguide Techniques before 1900,” Proc. IRE, Vol. 46, pp. 405–415, Feb. 1958. 15. G. Pelosi, S. Selleri, and B. Valotti, “Antennae,” IEEE Vehicular Technology Soc. Newsletter, Vol. 42, pp. 14–16, Aug. 2000.

Bandwidth is moderate (as much as 2:1). One property that can be a disadvantage is that the pattern main beam narrows with increasing frequency for a fixed physical aperture size. c01 7 April 2012; 13:2:26 20 Chapter 1 Introduction Table 1-4 Types of Antennas  Electrically Small Antennas: The extent of the antenna structure is much less than a wavelength λ. Properties: Low directivity Low input resistance High input reactance Low radiation efficiency Examples: Short dipole Small loop << λ << λ  Resonant Antennas: The antenna operates well at a single or selected narrow frequency bands.

In all cases, antennas have directional characteristics; that is, electromagnetic power density is radiated from a transmitting antenna with varying intensity around the antenna. In this section, we introduce the parameters used to evaluate antennas and then discuss the four types of antennas. Antenna performance parameters are listed in Table 1-3 and will be defined and developed in more detail in the next chapter. The radiation pattern (or simply, pattern) gives the variation of radiation with angle around an antenna when the antenna is transmitting.

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