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HELIAXIAL12 (910-1680MHz) Helical Antenna 11dBi, Circular Wireless
| Directivity/Gain | 11.5 dBi |
| Length | 390 mm |
| Diameter | 220 mm |
| Weight | 477 gr |
Opposite polarization rejection is especially important in circular polarization. In a simple way: the difference between co-polar component (right hand circular in this case) and cross-polar (left hand circular) is the attenuation that will introduce the antenna to capture the reverse polarization, which will come from the reflected signal that we want to avoid to reduce multipath. In these antennas is bigger than 10dB in all cases, which means that the reflected signal will reach the emitter attenuated at least 10dB with respect to the desired signal, which is great to prevent that it interferes with the desired signal.,
Details
The best build quality and performance! The helical antennas from Circular Wireless have raised the bar when it comes to circular polarized antennas!
Axial Mode Helical Antenna
Bandwidth 910-1680MHz
Right Hand Circular Polarization
SMA female connector (SMA male-male angled adapter included)
The helical antenna is one of the best directional antennas of circular polarization. It is highly tolerant, can vary slightly the diameter or pitch of the helix with virtually no impact on performance (although consistency is important), and the length or number of turns will determine the gain of the antenna.
I decided to build a model of 6.5 turns, with a gain of approximately 11dB, and a beamwidth of 60 degrees, making it easy to aim towards the plane, and is a good compromise between gain and antenna size.
As for the method for matching the impedance of the antenna, I opted for the Hecker transformer, because it gives consistent results, without requiring individual tuning with a SWR or a network analyzer.
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Found 10 years, 8 months ago