Performance Data and Geometry
Pattern and VSWR
Download as File


YBN 850-17 Yagi



LTE Low Noise Longyagi covering 800 to 870 MHz LTE band

Emphasising a high directivity factor over an extraordinary bandwidth predestinates this design to be a problem solver in very difficult spots for reception due to higher noise levels or to manage a connect at all in rural places.

Judging this antenna by comparing forward gain against advertised other LTE Yagis may not tell the full story. We often find quite opimistic gain numbers for boom length and bandwidth produced by marketing strategists. Not only on the field of LTE antennas. However I believe the key to an impressive Signal-to-Noise ratio especially for a wideband application is a very clean pattern. As whatever interfering signal occuring on the bandwidth of the receiving frontend of the LTE unit can not be suppressed by filters. Which otherwise would block a part of the designated band. To judge the abilities of a directive LTE antenna it takes both, gain and pattern cleanness. As the pair defines the ratio of signal and amount of noise received with it, known as Antenna G/T. Find more read about Antenna Temperature to Gain here

Attention: This is a directive antenna with a relatively high forward gain. Please keep transmission power inside the allowed limits in accordance to your local Telecommunication Regulations. Here is a link to my EIRP-Online Calculator

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YBN 850-17 modified to 15 elements and rescaled with EZNEC to US LTE 746-787 MHZ by C. Nelson

The reflector wall is removable for easy storing away.

Constructed and built with purely conventional pvc pipe, aluminum welding rods, brass tubing and epoxy

Craig reports: "I am astonished at the performance and it has greatly improved our internet availability while camping in our camper van."
Photo Credit: C. Nelson; Thank you.

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Performance Data

Gain vs. isotr. Rad.  15.2 to 15.8 dBi
Gain vs. Dipole       12.9 to 13.7 dBD
-3 dB E-plane         32.8 deg.
-3 dB H-plane         35.4 deg.
F/B                  -25.7 to 31.8 dB
F/R                  -25.7 to 27.6 dB
Impedance               50 ohms
Mechan. Length        1458 mm
Electr. Length        4.14 λ (840 MHz)

Stacking Dist. h-pol.
top-to-bottom         0.59 m = 1.93 ft
side-by-side          0.63 m = 2.07 ft

        Pos.    Full Length
                Free Space
				
Refl.     0        194.0
DE       76        175.0
D1       98        157.0
D2      154        155.0
D3      239        149.0
D4      357        145.0
D5      481        143.0
D6      615        140.0
D7      758        135.0
D8      905        133.0
D9     1057        132.0
D11    1205        129.0
D12    1347        128.0
D13    1478        122.0
 
                Ele. 4 mm
              Dipole 5 mm

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Pattern and VSWR Plots

Elevation and Azimuth plots from 820 to 860 MHz

Azim Plot at 840 MHz

Elev. Plots at 820, 840, 860 MHz

RL and SWR plot - simulated

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Downloads

EZNEC file of this Yagi (4 mm ele.)  








73, Hartmut, DG7YBN