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Likewise,
a purely circularly polarized field can be split into non-zero vertical and horizontal linear components. Roy Lewallen, W7EL Sooo, we can say that "slanted" 45 deg (circular) polarization as produced with full wave square shaped quad loop fed in a corner has vertical and horizontal components that are (typically) 3 dB down from the maximum in 45 deg plane? According to modeling software, which shows vertical and horizontal components of slanted polarization, the radiation pattern is a composite of both, with antenna responding to either V or H polarized waves (with 3 dB down from slanted) and according to pattern "belonging" to each (V or H) polarization. Is anything wrong with this statement? Can we then say that "slanted" polarization antenna has practically "dual" (V and H) polarization properties with 3 dB down from slanted orientation? Advantage being fuller radiation pattern (minimized nulls) and polarization "diversity" at a cost of 3 dB from the "ideal" slanted orientation. One "Guru" on his web page claims that there is no such thing as dual polarization. The "problem" seems to be in semantics. I see nothing wrong calling it "dual" polarization, because it produces combination patterns "belonging" to either V or H polarized antennas, (with 3 dB down from ideal slanted) and fuller pattern than either of V or H alone. It ain't so, am I wrong? Yuri Blanarovich www.K3BU.us www.computeradio.us - home of "Dream Radio One" |
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