Transcription of Chapter 5 - Loop Antennas
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Chapter 5 - Loop Antennas
Loop Antennas 5-1A loop antenna is a closed-circuit antenna that is, one in which a conductor is formed into one or more turns so its two ends are close together. Loops can be divided into two general classes,those in which both the total conductor length and the maximum linear dimension of a turn arevery small compared with the wavelength, and those in which both the conductor length and the loopdimensions begin to be comparable with the small loop can be considered to be simply a rather large coil, and the current distribution insuch a loop is the same as in a coil. That is, the current has the same phase and the same amplitude inevery part of the loop. To meet this condition, the total length of conductor in the loop must not exceedabout . Small loops are discussed later in this Chapter , and further in Chapter large loop is one in which the current is not the same either in amplitude or phase in every partof the loop.
point at which it is fed) the 1- λ loop will show a small gain over a 1/2-λ dipole. Theoretically, this gain is about 2 dB, and measurements have confirmed that it is of this order. The 1-λ loop is more frequently used as an element of a directive antenna array (the quad and
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