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art wrote:
On 13 Feb, 22:18, "Jerry Martes" wrote: "Bobby" wrote in message ups.com... All, How do you determine the axial ratio from a RHCP wave to a LHCP wave from an antenna? In essence, I need an axial ratio transformation from RHCP to LHCP. Any ideas on the equation or where I can find it will be helpful. Thanks. Bobby. Hi Bobby If you are working with an antenna that radiates RHCP it is totally insensitive to LHCP. If you have an antenna that radiates "RHCP" (or LHCP) the axial ratio is the ratio of the Minor axis to the Major axis of the E field. So, it varies from zero to one as the radiated field varies from Linear to Circular. Jerry You mentioned insensetivity above, are there any other polarities insensitive to others ? I note that weather antennas are now migrating to dual diversity antennas for horizontal and vertical, is it possible to totally isolate those too.? Art Any cross polarization situation will exhibit insensitivity to others. For instance take a vertical antenna and a horizontal antenna at a distance. There is a signifant reduction in signal strength. Or take a dipole oriented NS and a dipole oriented EW and you will see a loss of signal also. Dave WD9BDZ |
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