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The helical antenna (Fig 21-5) provides moderately wide bandwidth and circular polarization Because of the polarization some people find the helical antenna to be
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428 Antennas for radio astronomy particularly well suited to radio astronomy reception The antenna (of diameter D) will have a circumference C of 075 to 13 The pitch of the helix (S) is the axial length of one turn, while the overall length L NS (where N is the number of turns) The ratio S/C should be 022 to 028 At least three turns are needed to produce axial-mode main lobe maxima The diameter or edge of the groundplane G should be on the order of 08 to 11 if circular and/or square, respectively The offset between the groundplane and the first turn of the helix is 012 The approximate gain of the helical antenna is found from Gain The pitch angle 118 10 log (C2NS) and turn length D tan 1 S ( D)2 S2 The beamwidth of the helical antenna is K NS where is the beamwidth, in degrees N is the number of turns S is the pitch, in wavelengths C is the circumference, in wavelengths K is 52 for the 3-dB beamwidth and 115 for the beamwidth to the first null in the pattern The short section between the helix and the groundplane is terminated in a coaxial connector, allowing the antenna to be fed from the rear of the groundplane The feedpoint impedance is approximately 140 [215] dBi [212]
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for the helical antenna are given by [213]
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Stacking helical antennas allows a radiation pattern that is much cleaner than the normal one-antenna radiation pattern It also provides a good way to obtain high gain with only a few turns in each helix If two helixes are stacked, then the gain will be the same as for an antenna that is twice the length of each element, while for four stacked antennas the gain is the same as for a single antenna 4 times as long Figure 21-6 shows a side view of the stacked helixes The feed system for stacked helixes is a little more complex than for a single helix Figure 21-7A shows an end view of a set of four stacked helical antennas Tapered lines (TL) are used to carry signal from each element and the coaxial connector (B) In this case, the coaxial connector is a feed-through barrel SO-239 device at the center of the groundplane (B) A side view of the tapered line system
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Multiple helical antennas 429
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21-5 Helical antenna
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