Electronics > RF, Microwave, Ham Radio
Antenna Radiation Plots
metrologist:
I have some test data and images of radiation plots from an antenna manufacturer. I tried plotting the data but my plot does not line up with their images. I'm wondering if my plots are incorrect? The data steps 2 degrees.
E-Plane:
-7.888590917
-7.991426762
-7.964447174
-8.055839415
-8.071694362
-8.147931176
-8.260241409
-8.341474423
-8.426699407
-8.548298134
-8.67139238
-8.67490488
-8.752658922
-8.852553503
-8.900487254
-9.00316134
-9.077233122
-9.093310748
-9.174045254
-9.220654098
-9.293490848
-9.313394513
-9.371693904
-9.487061167
-9.530401973
-9.574138375
-9.670540487
-9.740592435
-9.812144818
-9.942311498
-10.0231087
-10.19606606
-10.41928699
-10.65396378
-10.85331617
-11.09422434
-11.50908977
-11.78147975
-12.20503227
-12.6067444
-13.16966564
-13.75408464
-14.53368964
-15.32319409
-16.22802423
-17.3506234
-18.69167397
-19.98061298
-21.3475124
-22.0921543
-22.17379745
-21.11051498
-19.72278204
-17.94414645
-16.3585565
-14.96053065
-13.55272146
-12.42186877
-11.23678058
-10.28379732
-9.384124269
-8.562270769
-7.807099997
-7.156599567
-6.48212977
-5.834852938
-5.285693965
-4.755729594
-4.279265125
-3.835901638
-3.402162353
-2.98161479
-2.637312242
-2.326132568
-1.97821019
-1.690502367
-1.458851522
-1.187267628
-0.95572021
-0.832346948
-0.902673455
-0.53869832
-0.327827659
-0.307425816
-0.080693535
-0.012614762
0
-0.053832101
-0.03515279
-0.021961633
-0.011269447
-0.00688131
-0.032863242
-0.104935266
-0.287209137
-0.461869844
-0.46769158
-0.658932299
-0.83811115
-1.099755593
-1.309226083
-1.682764918
-1.991389725
-2.228856793
-2.49925663
-2.849880381
-3.061748849
-3.371432041
-3.969178052
-4.383944758
-4.770213989
-5.229225957
-5.761678062
-6.275388761
-6.859275072
-7.442750791
-8.069397557
-8.684675392
-9.369884107
-10.05512583
-10.76591077
-11.52480213
-12.37664169
-13.16272559
-14.08060253
-15.07094322
-15.95004176
-17.17933236
-18.20689739
-19.57104888
-20.41060611
-22.07213948
-24.03719576
-25.70615388
-27.72814505
-30.03484659
-30.58290624
-30.04166738
-28.66846112
-26.58670704
-24.79886898
-23.36273108
-21.82148713
-20.61985291
-19.36934675
-18.44830622
-17.4853645
-16.78958131
-15.96296761
-15.20254271
-14.68470777
-14.08816028
-13.49542668
-12.99177124
-12.50782458
-12.01123076
-11.65864276
-11.1854634
-10.89073254
-10.46367354
-10.23437747
-9.864198535
-9.615021897
-9.401485169
-9.155035464
-8.966354894
-8.75208112
-8.609421715
-8.471269356
-8.318987282
-8.188331398
-8.035012643
-7.986077082
-7.98470578
-7.957964855
-7.870749283
-7.843170677
-7.779665174
-7.838151379
-7.884732798
-7.886538485
H-Plane:
-34.12474937
-33.94761734
-31.68726194
-29.01147271
-27.00119113
-26.18989902
-26.26651224
-26.45207089
-26.66280019
-26.18326016
-26.16620094
-26.46817391
-26.81687665
-26.98147921
-26.96056868
-26.8640185
-26.31099053
-25.76442834
-26.30603607
-27.73296402
-26.80813566
-23.9371756
-22.50988079
-22.40353494
-22.27733849
-21.5861555
-21.33355453
-20.7826906
-20.01964965
-20.55700425
-23.26336948
-23.17929264
-20.08434423
-18.0113634
-16.78494926
-17.24782763
-19.88373045
-18.69065855
-15.83494526
-16.1582191
-18.65361732
-17.71942159
-15.82679879
-15.76152372
-16.61449507
-15.99901296
-13.83985078
-12.80002144
-13.03144362
-13.17323193
-12.3761371
-11.64872938
-11.24472774
-10.61397746
-9.530553022
-8.4786042
-7.935212371
-7.629531081
-7.08442738
-6.413841022
-5.777208975
-5.360697228
-5.17403264
-5.058423751
-4.688049588
-4.218293156
-3.959826862
-4.058336164
-4.179930801
-4.030592562
-3.68892579
-3.431082434
-3.439336504
-3.482847901
-3.355125047
-2.99619726
-2.579155674
-2.185197609
-1.880236855
-1.58989397
-1.358433775
-1.170937165
-1.040371651
-0.856061176
-0.693351923
-0.475955121
-0.282505432
-0.141054838
-0.060930122
0
-0.010957614
-0.052525321
-0.148082818
-0.26249724
-0.438543547
-0.656521362
-0.872980017
-1.09570807
-1.319149981
-1.588191421
-1.822906272
-2.147848123
-2.584932925
-3.01938882
-3.495039565
-3.919970096
-4.203219008
-4.379055689
-4.618152813
-4.842536674
-5.084213373
-5.377986805
-5.730449431
-5.909225484
-5.943224896
-5.86374713
-6.055059844
-6.665822117
-7.240094328
-7.45660058
-7.788540352
-8.591182522
-9.33975479
-9.683607143
-10.49760566
-11.73614683
-12.55493694
-13.19178045
-14.72326456
-16.2604211
-16.40599655
-16.66292255
-17.48925792
-18.61801028
-19.66542484
-20.799605
-21.63210884
-22.06303023
-23.55754771
-25.68609775
-24.8908343
-24.14213744
-24.07381293
-23.40027338
-23.55611005
-25.51861171
-30.20647588
-33.44853371
-31.73955289
-31.99201338
-31.8482976
-29.60254114
-29.31416088
-33.1501321
-36.77554554
-30.88366371
-28.42153097
-28.68052773
-30.30314107
-32.70194725
-35.62465642
-39.53167966
-44.42485969
-37.91237143
-33.65262058
-30.82152635
-29.61894301
-28.76044969
-28.3696369
-28.18799428
-27.97060522
-28.29651233
-29.14764236
-30.03127911
-31.09373437
-32.52703335
-34.9736113
-37.09569996
-36.88556916
-35.11597151
-34.35887698
joeqsmith:
--- Quote from: metrologist on February 06, 2023, 04:23:15 pm ---I have some test data and images of radiation plots from an antenna manufacturer. I tried plotting the data but my plot does not line up with their images. I'm wondering if my plots are incorrect? The data steps 2 degrees.
--- End quote ---
Your post is vague. I am guessing the two plots you show are what the manufacture supplied along with the data below. You attempt to plot the data and suggest that you do not get the same results. You want to know if without you showing any of your work or your results if what you have is incorrect?
If I plot it, I get something close to the graphs you show so I am going to assume the work you fail to show is incorrect. Am I correct?
fourfathom:
Or are you wondering why your measured patterns don't agree with the published patterns? If so, there can be many reasons, and I would be quite surprised to see a perfect match.
metrologist:
The plots shown are mine. Why would we not expect the results to be the same? It looks like Joe's plots are on a linear scale, but I am showing a log scale so of course that will not fit. I have both from the mfg. and have superimposed my plot and the mfg's linear plot onto Joe's. The e-plane point at 270 degrees should be ~-30dB, and I scaled them to make that point land on the 270deg line.
Looking just at the h-plane data, if you look at the data and my plot, it seems like the point data falls in the correct place, but my plot reaches -infinity at the center. The mfg seems to scale theirs so the center is -50dB and Joe's at a wee bit less than -30dB.
They also orient the e-plane data "pointing" to the left, but mark the left side 180 deg. Isn't it normal to start the elevation plot pointing to the right at 0 deg? I rotated my plot to make that so, but realize the plot data runs clockwise so I need to flip the trace to match the ccw scale.
I also created a test plot with the top 90 deg starting at 0 dB and as rotating clockwise, each "notch" is -3, -10, -20, -30, -40, ... -80 dB, so it seems the data points land properly.
joeqsmith:
So we have yet to see the plots supplied by the manufacture. Still the same problem, I have no idea how your plots compare with the manufacture's. It would be better if you supplied all of the details upfront.
I am not understanding the emphasis of the angles, left, right and why you feel this matters.
I wonder what your end goal is.
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