Transcription of Large Loop Antennas
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Large Loop Antennas
Chapter 1 2/9/2005, 1:21 PM CHAPTER 10 CHAPTER 10 Large Loop Antennas The delta-loop antenna is a superb example of a high performance compromise antenna. The single-element loop antenna is almost exclusively used on the low bands, where it can produce low-angle radiation, requiring only a single quarter-wave high support. We will see that a vertically polarized loop is really an array of two phased verticals, and that the ground requirements are the same as for any other vertically polarized antenna.
1.2. Square Loop Patterns 1.2.1. Vertical polarization The vertically polarized quad loop, Fig 10-1B, can be considered as two shortened top-loaded vertical dipoles, spaced λ/4 apart. Broadside radiation from the horizontal elements of the quad is canceled, because of the opposition of currents in the vertical legs.
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