By Pat Hawker, D.E. Cole
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Extra info for Amateur Radio Techniques
Hccausc of diffraction. energy is usually houitccd around obstacle5 until i t reaches its target, although at 21 reduced strength Icvcl. 8. 32 Factors affecting propagation in wircless systems is caused by edges which cause secondary radiation sources when illuminated. Because different lincar polarizations reflect and penetrate surfaces differently. the inost cost-effective way to reach inside structures is through the use of circularly polarized hase-station aiiteiiiias. Circularly polarized waves contain all senses of linear polarization and will always contain the most favorable electric field vector for any given incidcnt angle.
Hut their gain drops off quickly with an incrc;isc in the number of rcllcctor cleincnts. Corner atid plane rcllcctot~soffer advantages over ollicr anleiinas iri tcrnis ol pattern and gain control. T h c x types of antennas are expiinding rapidly t o meet clcctrical and niech;incal dcniands of wirclc ystenis. Samples of arrays that arc U S ~ ~ L IiIn base stations include collineai- arrays oL‘ dipoles. dipole arrays over ii plane. 25). ‘Phc planning o f a base-station mtcnna is a task that involves the shape of llic covcragc iirca.
Another important capability o f adaptive antennas is that o f intcrfcrcncc reduction. Furtherinore, co-channcl intcrfcrcncc citn bc further reduced by having the base station steer the beams directionally toward the mobile u n i t .
Amateur Radio Techniques by Pat Hawker, D.E. Cole