Aspects of Achieving 10 v/m Field Uniformity over 1-6GHz with Single, Multiple and Cassegrain Antennas. Tom Mullineaux
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1 Aspects of Achieving 10 v/m Field Uniformity over 1-6GHz with Single, Multiple and Cassegrain Antennas Tom Mullineaux
2 EN Edition GHz, 10 3 meters
3 HEALTH WARNING
4 Field Generation Fundamentals
5 10v/m 1.5m 1.5m Test Field of a Prescribed Field Strength Across a Defined Plane
6 Equipment Under Test (EUT) One Face of EUT is Placed at the Plane EUT Is Monitored for Degradation in Performance when Exposed to Test Field Repeat for All Faces
7 Test Field Generation RF Input Power P Bore Sight Field E (v/m) Horn Antenna Gain G Test Plane Distance d
8 E = (30.P.G) / d Field Strength in v/m RF Power at Antenna Connector Gain of Antenna (Linear, not db) Distance from Antenna Fiddle Factor?
9 Area of Sphere 4πR 2 S = P/4πR 2 P Power Density S = E 2 /Z o S = E 2 /120π Impedance of Free Space Zo is 120π (377 Ohms)
10 P/4πR 2 = E 2 /120π E 2 = 120π.P / 4πR 2 E 2 = 30.P / R 2 E = (30.P) / R E = (30.P.G) / d
11 P = d 2 E 2 / 30G RF Power at Antenna Connector Implication: Two Times the Gain Means Half RF Power is Required
12 Characteristics of High Gain / Low Gain Antennas
13 Test Plane Illumination Falls with Distance Bore Sight Max E(v/m)
14 Medium Gain Horn Illumination E/ 2 Bore Sight Max E(v/m) Beam Width (Degrees) E/ 2
15 High Gain Horn Illumination E/ 2 Bore Sight Max E(v/m) E/ 2 Beam Width (Degrees)
16
17
18 10v/m, -0dB, +6dB 1.5m 1.5m 16 points all between 10 and 20 v/m
19 Test Plane Illumination 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB Bore Sight
20 Effect of Higher Gain 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB Bore Sight
21 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
22 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
23 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
24 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
25 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
26 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
27 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
28 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
29 16 points all between 10 and 20 v/m 10v/m, -0dB, +6dB
30 EQUIVALENT TO??
31 Beam Width is Becoming Important - Some Standards Now Insist the EUT Fits Inside the Antenna Beam Width EUT Must Fit Here Half-Power Density = E/ 2 Emax
32 Advantages / Disadvantages of Each Antenna Type
33 High Gain Horn Advantage Reduced RF Power Requirement
34 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area
35 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?)
36 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?) Higher Field Contribution from Harmonic
37 Wanted Test Frequency Harmonic Signal, Un-Wanted Test Frequency
38 High Gain at Harmonic Frequency E/ 2 (-6dB) E (v/m) Measured Field is Sum of Wanted Field and Un-Wanted Field E/ 2 (-6dB)
39 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?) Higher Field Contribution from Harmonic
40 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?) Higher Field Contribution from Harmonic Less Bandwidth so More Antennas Required
41 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?) Higher Field Contribution from Harmonic Less Bandwidth so More Antennas Required Medium Gain Horn Advantage Large Illumination Area
42 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?) Higher Field Contribution from Harmonic Less Bandwidth so More Antennas Required Medium Gain Horn Advantage Large Illumination Area Less Field Contribution from Harmonic
43 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?) Higher Field Contribution from Harmonic Less Bandwidth so More Antennas Required Medium Gain Horn Advantage Large Illumination Area Less Field Contribution from Harmonic Wider Bandwidth, One Antenna Required
44 High Gain Horn Advantage Reduced RF Power Requirement High Gain Horn Disadvantage Smaller Illumination Area (equivalent?) Higher Field Contribution from Harmonic Less Bandwidth so More Antennas Required Medium Gain Horn Advantage Large Illumination Area Less Field Contribution from Harmonic Wider Bandwidth, One Antenna Required Medium Gain Horn Disadvantage Higher RF Power Requirement
45 Field Uniformity Through Use of Multiple High-Gain Antennas
46 Multiple High-Gain Horn Illumination
47 16 points all between 10 and 20 v/m
48 16 points all between 10 and 20 v/m 14v/m 14v/m 10v/m 12v/m 10v/m 14v/m 14v/m One Test Run Only
49 EQUIVALENT TO??
50 Reduced Risk of Corona Effect Due to Power Sharing 200v/m
51
52
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54
55
56
57
58 Use of Shaped Reflector Plate
59 Beamwidth Spreading
60
61 Worked Example Using 3115
62
63
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67 Aspects of Achieving 10 v/m Field Uniformity over 1-6GHz with Single, Multiple and Cassegrain Antennas QUESTIONS? Tom Mullineaux
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