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Electromagnetics and Antenna Technology. Chapters 1, 2, 3

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Technical Report

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MIT Lincoln Laboratory Lexington United States

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The theory given in this chapter can be used to gain some basic insight into the fundamental radiation properties of antennas. In the case of an array of antennas, the radiation properties of one array antenna element have an effecton the surrounding array antenna elements, and thus the interaction between the array antenna elements must be taken into account in any detailed analysis. Some methods for computing the performance of phased array antennas taking account of mutual coupling effects are discussed in Chapter 2. This chapter, together with Chapter 1, has reviewed the important foundation of electromagnetic theory for application to phased array antenna development. In this chapter, basic array theory, the reaction integral equation, method of moments, and infinite-array theory were reviewed in detail to allow the analysis of phased array antennas, including the effects of mutual coupling between the antenna elements. In the following chapters, the practical design and development of ultra wideband array antennas is described. The method of moments is used in designing and analyzing the performance of these prototype antennas. This chapter has reviewed the line transformer theory and method for impedance matching a complex antenna load to a target VSWR over a wide band of frequencies. The input impedance of an example UHF crossed swept-back dipole antenna was simulated using the method of moments. The line transformer impedance matching method was applied to the simulated antenna and a wide-band match was achieved. This impedance matching technique can be applied readily to other antennas. This type of dipole antenna has wide-angle pattern coverage and was shown to provide wideband performance as a feed for a parabolic reflector antenna.

Subject Categories:

  • Electricity and Magnetism
  • Electrical and Electronic Equipment

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