1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance...
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Transcript of 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance...
![Page 1: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/1.jpg)
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Effects of Quadratic Phase Error
![Page 2: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/2.jpg)
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Patterns at different range
• If the antenna isimpedance matched, how can we check the Antenna is in radiation?• Antenna operation is usually in Fraunhofer region• Near field region is suitable for NF measurement, why?
![Page 3: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/3.jpg)
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Far Field Range
Phase error of far field range
8R
d with
2 2
k
For maximum of 16
Rd
2 2
Quadratic phase error is
when
22 5.
Rd
2 2
![Page 4: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/4.jpg)
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• Quadratic phase error is at
22 5.
R D 2 2
• Quadratic phase error is at
1125.
R D 4 2
• Quadratic phase error is at
0
R infinity
Patterns due to quadratic phase error
Effect of Quadratic Phase Error1. Gain is reduced2. Wider the beamwidth3. Higher the first SLL4. Higher the first null value
![Page 5: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/5.jpg)
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Definition of Quiet Zone
1. The zone area (length, width, height) which antenna or target under test
2. Performance of E field on the wavefront
E field with taper and ripple in both amplitude and phase
3. For ideal plane wave
Amplitude: taper 0 db, ripple 0 db
Phase: taper 0 degree, ripple 0 degree
4. The larger the amplitude/phase error in the wavefront, the larger the error for the result of pattern measurement
![Page 6: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/6.jpg)
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Anechoic chambers and corresponding side-wall reflections
![Page 7: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/7.jpg)
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Antenna-range measuring system
![Page 8: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/8.jpg)
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Near- and far-field phase pattern measurements
![Page 9: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/9.jpg)
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Single frequency measuring system
![Page 10: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/10.jpg)
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Swept frequency measuring system
![Page 11: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/11.jpg)
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Polarization measuring system
![Page 12: 1 Effects of Quadratic Phase Error 2 Patterns at different range If the antenna is impedance matched, how can we check the Antenna is in radiation? Antenna.](https://reader035.fdocuments.in/reader035/viewer/2022070404/56649f385503460f94c54cab/html5/thumbnails/12.jpg)
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Polarization amplitude and phase measurements