3D Antenna Positioner

3D Antenna Positioner

RK Telesystem is offering complete set of 3 D positioner & accessories required for antenna positioning for far-field pattern plotting. As against rotary tables which have been the common practice, we offer state of the art 3 D positioner for research and development & measurement in antennas. It provides freedom required for antenna pattern measurement.One is able to hold the antenna from the back lobe and rotate the antenna by 360 degree along horizontal plane for azimuthal measurements. Over 90 degree of rotation in vertical plane is used for elevation plane measurements. The stepper motor controlled rotator is controlled by PC using software provided.The data acquisition system software controls the axis motors and synchronizes the VNA to record the RF level corresponding to different angular locations. The data array is then used to synthesize the pattern in 3D for visualization as per IEEE norms. Low loss cables armored cables connect the Reference and test antennas to the VNA (provided by the customer). The system is able to interface to Keysight, R&S, Anritsu, Planar brands of VNA’s. A pair of dual ridge horn antennas with calibration charts complete the measurement setup for measuring the gain of the test antenna. Pyramidal absorbers are used to shroud the antenna rotator to reduce the radar cross section and reduce the induction in near field. This enables the antenna to be measured in near anechoic field and obviates the need for anechoic chamber for >50% of antenna measurements. For R&D a quick first pass of measurement is desired for faster iterations and emphasis is mostly on main lobe, gain, beamwidth, side lobe levels etc. Only when the need is to characterize these with a higher order of accuracy and <-20dB side lobe levels do we really would require an anechoic chamber.

Planar Horn

Antenna Pattern at 2.4  GHz , 4.0  GHz and 12 GHz

Features:
  • 3D Positioner (with VNA interfacing for Automatic Measurement of 3D pattern, gain measurement,S-parameter etc).
  • Azimuth Start Angle : -360 to 360 degree
  • Azimuth Stop Angle : -360 to 360 degree
  • Azimuth Min Step Size : 1 degree
  • Elevation Start Angle : -360 to 360 degree
  • Elevation Stop Angle : -360 to 360 degree
  • Elevation Min. Step Size : 1 degree
  • 18GHz Ultra Low loss Testing cables (approx. 2m)
  • Planar Horn: 900MHz to 12.4 GHz- 2 Nos.
  • Connectors & adapters: SMA(F) to SMA(F) Adapter; N(F) to N(F) adapter.
  • 3D Visualization and Data Acquisition Software.

Complies with IEEE Std 149-1979, “Test Procedure for Antennas

Hardware Technical Specifications

Azimuth Start Angle : -360 to 360 degree
Azimuth Stop Angle : -360 to 360 degree
Azimuth Min Step Size : 1 degree
Elevation Start Angle : -360 to 360 degree
Elevation Stop Angle : -360 to 360 degree
Elevation Min. Step Size : 1 degree
Power 12 V Adapter
Control : Software via USB
No of cycles of rotation : User Configurable
Return to Home : Yes
Loading Capacity : 1 Kg
Material : Aluminum alloy
Finish : Low Radar cross section
Motor : Std. Nema23/34 stepper
motor
Rating : 2 Amp/Phase
Resolution : 1.8 degree per step
Controller output : 4 amps peak current
Motor type : 2/4 phase bipolar stepper
Communication : USB
Microcontroller : 32 bit
Power Input : 90-260 Volts AC
Radar Cross Section : -20dBsm
Software : USB Interface for motion control, USB/LAN for VNA data acquisition and motor synchronization. 3D visualization of antenna pattern, polar plotting with log, linear cartesian and polar plots, Multiple pattern overlay, 3dB/10dB beamwidth, Gain, Front to back,Side lobe level and position,Plot rotate, File- edit, save,get, Export to csv/xls format,
Compatibility : Keysight, Anritsu, R&S,
Planar VNA
Planar Horn : 0.9 GHz – 12.4 GHz- 2 Nos.
Polarisation : Linear
Beamwidth : 60 degrees ( Mid-Band Typ.)
VSWR : 0.9 GHz – 0.15GHz <2.5:1
1.5GHz – 12.4GHz <2.0:1
Gain : 5.5dBi @ 1GHz Typ.
8dBi @ 2.7GHz Typ.
5dBi @ 6GHz Typ.
Power Handling : 10W
Aperture Width : 165mm
Length : 230mm
Microwave Cable : SMA-SMA cables 2m, 2-Nos
Insertion Loss : 6dB 12-18 GHz
Absorber on Motor : EM Lossy PU Foam
Pyramidal Reflection : -25dB @ 10GHz
Equivalent RCS : -30dBsm 10-18GHz

List of Experiments
  1. 3D Radiation pattern of antenna.
  2. To plot the radiation pattern of an omnidirectional antenna.
  3. To plot the radiation pattern of a directional antenna
  4. To measure axial ratio and cross polarization discrimination of vertically horizontally and circularly polarized antennas.
  5. To measure the VSWR of the antenna
  6. To demonstrate that transmitting and receiving patterns of an antenna are equal and hence confirm the reciprocity theorem of antennas
  7. To plot the radiation pattern (E & H Plane Polar & Cartesian Plots on Log/Linear scale of an antenna on PC.
  8. To measure the ANTENNA PARAMETERS (directivity, gain, beam width (Half Power/10dB), front to back ratio, plane of polarization, cross polarization discrimination,side lobe level and its angular position from polar plot, VSWR/return loss) of Dipole.
  1. To measure antenna parameters of Yagi.
  2. To measure antenna parameters of Slot.
  3. To measure antenna parameters of Transformer fed Patch and inset fed Patch.
  4. To measure parameters of right circularly polarized patch and left circularly polarized patch.
  5. To measure antenna parameters of Spiral & Spiral Slot.
  6. To measure the cross polarization discrimination for circular.
  7. To measure antenna parameters of Log Periodic.
  8. To measure antenna parameters of Circular patch.
  9. To measure antenna parameters of Folded Dipole.
  10. To measure antenna parameters of Loop.
  11. To measure parameters of Endfire and Broadside array.
  12. To measure antenna parameters of Patch array 2X2, and Dual Patch.
  13. To measure antenna parameters of monopole.
  14. To measure antenna parameters of Pyramidal Horn (E plane Horn, H plane Horn and open waveguide antenna.
  15. To measure antenna parameters conical Horn.
  16. To measure parameters of monopole.
  17. To measure antenna parameters of Slot Narrow Wall & Broad Wall slot Antenna
  18. To measure parameters of Parabolic dish.
  19. To measure antenna parameters of Patch array 4X4, Patch array 2X2, Dual Patch array, Inset fed Patch, Circularly Polarized Patch antenna
  20. To measure antenna parameters of Helix RHCP & LHCP.
Shipping List
Sr. No.List Of Items Supplied In 3d Antenna Positioner
Qty.
1Controller Unit + Power Cord1
2Experimental Manual1
3Non Radiating Monopods1
4SMA(M) – SMA(M) Low Loss Cables 2m2
5Spanner1
6Allen Key1

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