Content deleted Content added
Citation bot (talk | contribs) Added bibcode. | Use this bot. Report bugs. | Suggested by Whoop whoop pull up | #UCB_webform 85/2985 |
LEATHERFACE (talk | contribs) |
||
Line 168:
==Antennas==
{{Over-quotation|section|date=April 2018}}
A number of different types of antenna elements can be used to produce circularly polarized (or nearly so) radiation; following [[Constantine A. Balanis|Balanis]],<ref name=Balanis>Balanis, Constantine A. "Antenna Theory
<blockquote>"... two crossed dipoles provide the two orthogonal field components.... If the two dipoles are identical, the field intensity of each along zenith ... would be of the same intensity. Also, if the two dipoles were fed with a 90° degree time-phase difference (phase quadrature), the polarization along zenith would be circular.... One way to obtain the 90° time-phase difference between the two orthogonal field components, radiated respectively by the two dipoles, is by feeding one of the two dipoles with a transmission line which is 1/4 wavelength longer or shorter than that of the other," p.80;</blockquote>
or [[Helical antenna|''helical elements'']]:
| |||