R&S®NRPM OTA power measurement solution

R&S®NRPM OTA power measurement solution
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R&S®OTA power measurement solution, RF shield box
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R&S®NRPM-A90 single-polarized antenna module
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R&S®NRPM-A90D dual-polarized antenna module
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R&S®NRPM3 3-channel sensor module
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R&S®NRPM-Z3 interface module
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R&S®NRPM-ZD3 filtered feedthrough module
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R&S®NRPM OTA power measurement solution R&S®OTA power measurement solution, RF shield box R&S®NRPM-A90 single-polarized antenna module R&S®NRPM-A90D dual-polarized antenna module R&S®NRPM3 3-channel sensor module R&S®NRPM-Z3 interface module R&S®NRPM-ZD3 filtered feedthrough module

Key facts

  • Frequency range from 18 GHz to 90 GHz
  • Ideal for beamforming tests
  • For 5G, WLAN IEEE 802.11ad and IEEE 802.11ay
  • Fully calibrated antenna module with integrated diode detector
  • Scalable to customer requirements
  • 3 years warranty extension

Designed for extremly accurate Over-the-Air (OTA) power measurements

The R&S®NRPM is a fully calibrated and individual scalable OTA power measurement solution for benchtop application or in anechoic chambers. Covering a frequency range from 18 GHz to 90 GHz it is perfect for Over-the-Air (OTA) beamforming verification in 5G, WLAN IEEE 802.11ad and IEEE 802.11ay and the calibration of the transmit antenna output power.

Features & benefits

Specified system uncertainty

Fully calibrated OTA power measurement system with specified system uncertainty

With conventional OTA systems, measurement uncertainty comes from frequency-dependent antenna gain and antenna pattern and from mismatched RF components. By measuring power directly at the antenna, the R&S®NRPM solution avoids this problem because it does not need any additional RF components. Moreover, the antenna gain, the antenna pattern and the diode detector are calibrated together. Complicated system calibration by the user is not necessary.

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OTA power measurement system

Low-reflection antenna module

Low radar cross section to avoid disturbing reflections

The R&S®NRPM-A90 and -A90D antenna modules have a very low radar cross section of typically < –26 dB/sm, putting them about 15 dB/sm below the value of a typical horn antenna. This makes them ideally suited for use in a screened environment, due to the virtual absence of reflections.

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R&S®NRPM-A90 low-reflection antenna module

Very high sensitivity

R&S®NRPM OTA power measurement solution therefore uses a highly sensitive diode detector which is integrated directly on the antenna

The R&S®NRPM-A90 and R&S®NRPM-A90D antenna modules are therefore able to measure power down to -76 dBm. For example, a DUT with a transmit power of -10 dBm can be positioned at a distance of 1 m, and  the received power at the antenna module can still be determined precisely.

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OTA power measurement solution, benchtop

System calibration for OTA receiver tests

To test the receiver of the DUT, it is necessary to know exactly the power at the DUT, transmitted OTA to the DUT. To calibrate this measurement setup, the R&S®NRPM-A90 antenna module is positioned at the DUT to calibrate the transmit power of the signal generator. The calibration is done with an R&S®NRPM-A90/A90D antenna module, which is then replaced by the DUT. The receive power of the DUT is then exactly known.

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System calibration for OTA receiver tests

TX beamforming verification

Multiple R&S®NRPM-A90/A90D antenna modules are needed to test the beamforming function. If the antenna beam is directed at a specific antenna module, this module shows the highest power of all antennas. Three antenna modules – arranged in a plane – are used to verify whether beamsteering in the horizontal plane functions properly. To test vertical beamforming, the R&S®NRPM-A90/A90D antenna modules must be arranged in at least two horizontal planes.

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TX beamforming verification

Specifications
R&S®NRPM-A90 single polarized antenna
Frequency range   18 GHz to 90 GHz
Power measurement range (frequency dependent) continuous average -76 dBm to -19 dBm
  trace -63 dBm to -19 dBm
Rise/fall time   2.2 μs
Video bandwidth   220 kHz
Measurement uncertainty
18 GHz to 24 GHz absolute 0.68 dB to 0.81 dB
  relative 0.05 dB to 0.09 dB
> 24 GHz to 35 GHz absolute 0.49 dB to 0.66 dB
  relative 0.05 dB to 0.09 dB
> 35 GHz to 57 GHz absolute 0.50 dB to 0.72 dB
  relative 0.05 dB to 0.09 dB
> 57 GHz to 71 GHz absolute 0.58 dB to 0.83 dB
  relative 0.05 dB to 0.09 dB
> 71 GHz to 81 GHz absolute 0.61 dB to 0.91 dB
  relative 0.05 dB to 0.09 dB
> 81 GHz to 90 GHz absolute 0.69 dB to 0.97 dB
  relative 0.05 dB to 0.09 dB
R&S®NRPM-A90D dual polarized antenna
Frequency range   18 GHz to 90 GHz
Power measurement range (frequency dependent) continuous average -76 dBm to -19 dBm
  trace -63 dBm to -19 dBm
Rise/fall time   2.2 μs
Video bandwidth   220 kHz
Measurement uncertainty (measurement distance 1m)
18 GHz to 24 GHz absolute 0.73 dB to 0.85 dB
  relative 0.05 dB to 0.09 dB
> 24 GHz to 35 GHz absolute 0.55 dB to 0.71 dB
  relative 0.05 dB to 0.09 dB
> 35 GHz to 57 GHz absolute 0.59 dB to 0.78 dB
  relative 0.05 dB to 0.09 dB
> 57 GHz to 71 GHz absolute 0.68 dB to 0.90 dB
  relative 0.05 dB to 0.09 dB
> 71 GHz to 81 GHz absolute 0.72 dB to 0.99 dB
  relative 0.05 dB to 0.09 dB
> 81 GHz to 90 GHz absolute 0.87 dB to 1.10 dB
  relative 0.05 dB to 0.09 dB

Available options

Antenna modules
Product Description
R&S®NRPM- A90 single polarized antenna module

R&S®NRPM-A90

Order number 1426.7760.02

Description

Single-polarized antenna module

Fully calibrated, low-reflection, single-polarized Vivaldi antenna with an integrated diode detector for power measurements.

R&S®NRPM-A90D dual-polarized antenna module

R&S®NRPM-A90D

Order number 1426.7777.02

Description

Dual-polarized antenna module

Two low-reflection, single-polarized Vivaldi antennas with an integrated diode detector, precisely arranged in a right angle. This allows measurement in both polarization directions.

Sensor modules
Product Description
NRPM3-Three-Channel_Sensor_Module_img1.jpg

R&S®NRPM3

Order number 1425.8563.02

Description

Three-channel sensor module

Interface for shielded RF test box
Product Description
R&S NRPM-ZD3 filtered cable feedthrough

R&S®NRPM-ZD3

Order number 1425.8786.02

Description

Filtered cable feedthrough

R&S®NRPM-ZKD3 interface cable

R&S®NRPM-ZKD3

Order number 1425.8770.02

Description

Interface cable

Interface for benchtop application
Product Description
R&S®NRPM-Z3 interface module

R&S®NRPM-Z3

Order number 1426.7602.02

Description

Interface module

The R&S®NRPM-Z3 is directly plugged onto the R&S®NRPM3 three-channel sensor module and can host up to three R&S®NRPM-A90 antenna modules to avoid additional cables.

General accessories
Product Description
NRP-ZKU USB interface cable

R&S®NRP-ZKU

Order number 1419.0658.02

Description

USB interface cable, length: 0.75 m

NRP-ZKU USB interface cable

R&S®NRP-ZKU

Order number 1419.0658.03

Description

USB interface cable, length: 1.5 m

NRP-ZKU USB interface cable

R&S®NRP-ZKU

Order number 1419.0658.04

Description

USB interface cable, length: 3 m

NRP-ZKU USB interface cable

R&S®NRP-ZKU

Order number 1419.0658.05

Description

USB interface cable, length: 5 m

R&S®NRP-ZK6

Order number 1419.0664.02

Description

6-pole interface cable, length: 1.5 m

R&S®NRP-ZK6

Order number 1419.0664.03

Description

6-pole interface cable, length: 3 m

R&S®NRP-ZK6

Order number 1419.0664.04

Description

6-pole interface cable, length: 5 m

NRP-Z5_Sensor_Hub_front.jpg

R&S®NRP-Z5

Order number 1146.7740.02

Description

USB sensor hub

R&S®NRP-Z5 can host up to 4 R&S®NRPxxS(N), R&S®NRPxxT(N), R&S®NRPxxA(N) or R&S®NRP-Z sensors. A professional trigger solution allows simultaneous internal and external triggering of all connected sensors.

R&S®NRPM-ZKT

Order number 1425.8857.02

Description

Trigger cable

Related videos

Using the R&S®NRPM

18-May-2020

Understanding OTA Power Measurements

18-May-2020

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