Medium Compact Range Systems

Medium Compact Range Systems

Model: CRS-CSC / CRS-ESC

Features
  • Versatile Quiet Zone Sizes
  • Broad Frequency Coverage
  • Superior Quiet Zone Performance
  • Robust Payload Capacity
  • Precision Engineering
  • Multi-Application Capability
  • Flexible System Enhancements
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Description

NSI-MI’s Medium Compact Range Systems (CRS-CSC / CRS-ESC) deliver exceptional performance for testing directive antennas—offering a smarter alternative to traditional far-field and near-field ranges. Designed for indoor use, these systems require significantly less space than far-field ranges while maintaining, or even exceeding, their performance. This indoor capability also ensures greater test availability, free from weather-related delays or logistical constraints.

Unlike near-field systems, compact ranges streamline the testing process by eliminating the need to scan the entire antenna aperture to obtain a single far-field pattern cut. This results in faster, more efficient evaluations of antenna performance.

Compact Range System Models
CRS-CRC-0.5-18
CRS-CSC-0.9-4
CRC-CRC-0.5-8
CRS-CSC-1.2-3
CRC-CRC-0.8-18
CRS-CSC-1.5-2
CRC-CRC-0.8-4
CRS-ESC-1.2 x 1.8-2
CRS-CRC-1.0-2
CRS-CSC-1.8-2
CRS-CRC-1.2-2
CRS-CSC-2-1.5
Precision Reflector Technology: Creating the Ideal Quiet Zone for Antenna Testing

At the heart of the compact range is a precision-engineered reflector system. It generates a planar electromagnetic wavefront by collimating spherical waves from a feed antenna positioned at the reflector’s focal point. This creates a “quiet zone” where the antenna under test (AUT) is exposed to a highly uniform field, ideal for accurate measurements. The reflector’s prime focus virtual vertex design minimizes multipath interference by positioning the vertex below the reflector surface, keeping the feed antenna clear of the test zone’s collimated energy.

Compact Range System Construction

The major elements of the Medium Compact Range Systems are highlighted below.

CRS-CRC-0.9-4
Anechoic Chamber with RF Absorber

With decades of combined experience, NSI-MI delivers turnkey anechoic environments that meet stringent quality standards and industry specifications. Our expert team supports every stage of the project—from CAD design and structural engineering to absorber layout and chamber integration—ensuring optimal quiet zone quality and measurement accuracy. NSI-MI’s engineers are highly skilled in RF antenna, radome, and RCS testing, consistently delivering reliable, high-performance results.

Anechoic chamber with RF absorber 
Compact range reflector 
Compact Range Reflector

NSI-MI’s compact range reflector systems offer the full benefits of far-field testing in secure, indoor environments, dramatically reducing required test distances while maintaining accuracy. Available in a wide range of sizes and frequencies, these systems feature advanced serrated or rolled edge treatments to minimize diffraction and ensure clean wavefronts. Custom reflector designs are also available to meet specific electromagnetic requirements, making NSI-MI a trusted provider of high-performance testing solutions.

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Feed Positioner

Designed for precision and adaptability, the Compact Range Feed Positioner delivers reliable support for single and dual-polarized feeds across discrete frequency bands. Engineered to ensure optimal feed alignment, it guarantees ideal reflector illumination—resulting in improved test accuracy and repeatability.

Precision Adjustability:
Effortlessly fine-tune both the distance and angle of the feed assembly to achieve ideal focus and alignment with the compact range reflector.

Automated Polarization Control:
Featuring a motorized polarization axis, the system enables smooth, automated rotation of the feed antenna—simplifying polarization adjustments and boosting operational efficiency.

Feed positioner 
AUT Positioner 
AUT Positioner

NSI-MI’s AUT (Antenna Under Test) Positioner is purpose-built to securely support and precisely orient antennas within the quiet zone of the compact range—ensuring accurate and repeatable measurements. Its configurable multi-axis design allows for seamless adaptation to a wide range of testing scenarios. With a broad selection of standardized add-on options, the system offers exceptional flexibility to meet your specific application needs.

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Feed Antennas

NSI-MI Technologies offers high-performance dual and linear polarized feed horns ideal for anechoic chamber applications, covering frequencies from 0.75 to 110 GHz. These feeds deliver broad, consistent beamwidths and low cross-polarization, ensuring optimal illumination for compact range reflectors. With customizable beamwidths and stable radiation patterns across the full waveguide band, they enhance measurement accuracy and chamber performance for antenna testing.

Linear Polarized Dual Polarized
Feed positioner
Feed positioner
RF Subsystem with Rotary Joints and Cables

NSI-MI Technologies offers a fully integrated RF subsystem, enabling fast and accurate data acquisition to maximize range efficiency. The system includes scanner and range RF cables, rotary joints, RF components and devices, software drivers, and advanced data acquisition and plotting software. Designed for compatibility with both NSI-MI instrumentation—as well as many third-party systems—this subsystem ensures seamless operation and high-performance measurements in antenna  testing environments.

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Data Acquisition and Analysis Workstation

NSI-MI’s Data Acquisition and Analysis Workstation creates and supports productive test environments with streamlined, fully automated systems for antenna, radome, and radar cross-section measurements. From setup to analysis and reporting, it delivers complete control and high-efficiency data handling for microwave and antenna testing. The workstation includes both hardware and software components, featuring NSI-MI’s A4 software for fast, reliable data acquisition, processing, and plotting—ensuring consistent performance across a wide range of measurement applications.

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Feed positioner
Physical Parameters
CRS-CSC-1.2-3
  • Specifications
  • Absorber Kits
  • Applications
  • Available Add-Ons
Parameters CRS-CSC-0.9-4 CRS-CSC-1.2-3 CRS-CSC-1.5-2 CRS-ESC-1.2x1.8-2 CRS-CSC-1.8-2 CRS-CSC-2-1.5
Quiet Zone Size ø0.9 x 0.9 m long
ø3 x 3 ft long
Circular Cylinder		 ø1.2 x 1.2 m long
ø4 x 4 ft long
Circular Cylinder		 ø1.5 x 1.5 m long
ø5 x 5 ft long
Circular Cylinder		 1.2 x 1.8 x 1.8 m
4 x 6 x 6 ft
Elliptical Cylinder		 ø1.8 x 1.8 m long
ø6 x 6 ft long
Circular Cylinder		 ø2 x 2 m long
ø6.6 x 6.6 ft long
Circular Cylinder
Frequency Range 4-110 GHz
 3-110 GHz
 2-110 GHz
 2-110 GHz
 2-110 GHz
 1.5-110 GHz
Amplitude Taper* ≤1.0 dB
Amplitude Ripple* ±0.5 dB
Phase Variation* ±5° (4–18 GHz)
±10° (18–50 GHz)
 ±5° (3–18 GHz)
±10° (18–50 GHz)
 ±5° (2–18 GHz)
±10° (18–50 GHz)		 ±5° (2–18 GHz)
±10° (18–40 GHz)		 ±5° (2–18 GHz)
±10° (18–50 GHz)		 ±5° (1.5–18 GHz)
±10° (18–50 GHz)
Cross Polarization
(On-Axis)		 -30 dB
Load Capacity,
Operation		 227 kg
(500 lb)		 45 kg
(100 lb)		 227 kg
(500lb)		 227 kg
(500 lb)		 227 kg
(500 lb)		 181 kg
(400 lb)
Bending Moment,
Operation		 678 Nm
(ft-lb 500)		 203 Nm
(150 ft-lb)		 2,712 Nm
(2,000 ft-lb)		 2,712 Nm
(2,000 ft-lb)		 2,712 Nm
(2,000 ft-lb)		 1,017 Nm
(750 ft-lb)
Feed Travel ±200° / Continuous
Roll Travel ±200° / Continuous
Offset Slide Travel 762 mm (30 in.) 914 mm (36 in.) 762 mm (30 in.) 762 mm (30 in.) 762 mm (30 in.) 813 mm (32 in.)
Azimuth Travel ±200°
Elevation Travel N/A +30/-90° 0°-90° 0°-90° 0°-90° -5° to +90°
Feed Speed 18°/sec 48°/sec 48°/sec 48°/sec 48°/sec 48°/sec
Roll Speed 18°/sec
Azimuth Speed 9°/sec 9°/sec 6°/sec 6°/sec 6°/sec 6°/sec
Elevation Speed N/A 1.5°/sec 0.7°/sec 0.7°/sec 0.7°/sec 0.5°/sec
Feed
Position Readout Accuracy		 ±0.2° ±0.07° ±0.07° ±0.07° ±0.07° ±0.07°
Roll
Position Readout Accuracy		 ±0.05°
±0.01°		 ±0.05°
±0.01°		 ±0.05°
±0.01°		 ±0.05°
±0.01°		 ±0.05°
±0.01°		 ±0.05°
±0.01°
Offset Slide
Position Readout Accuracy		 ±2.5 mm
(±0.1 in.)		 ±0.25 mm
(±0.01 in.)		 ±0.25 mm
(±0.01 in.)		 ±0.25 mm
(±0.01 in.)		 ±0.25 mm
(±0.01 in.)		 ±0.25 mm
(±0.01 in.)
Azimuth
Position Readout Accuracy		 ±0.05°
±0.005°		 ±0.04°
±0.005°		 ±0.04°
±0.005°		 ±0.04°
±0.005°		 ±0.04°
±0.005°		 ±0.04°
±0.005°
Elevation
Position Readout Accuracy		 N/A ±0.05°
±0.005°		 ±0.05°
±0.005°		 ±0.05°
±0.005°		 ±0.05°
±0.005°		 ±0.05°
±0.005°

Physical Parameters CRS-CSC-0.9-4 CRS-CSC-1.2-3 CRS-CSC-1.5-2 CRS-ESC-1.2x1.8-2 CRS-CSC-1.8-2 CRS-CSC-2-1.5
Recommended chamber size
(Interior wall dimensions,
H x W x L)
 3.4 x 3.7 x 6.3 m
11.2 x 12.1 x 20.7 ft		 4.3 x 4.6 x 9.4 m
14.1 x 15.1 x 30.8 ft		 5.4 x 5.6 x 10.2 m
17.7 x 18.4 x 33.5 ft		 5.6 x 6.2 x 11.1 m
18.4 x 20.3 x 36.4 ft		 6 x 6.2 x 11.1 m
19.7 x 20.3 x 36.4 ft		 7 x 7.4 x 12.5 m
23 x 24.3 x 41 ft
Minimum Chamber Entrance
Size (H x W)		 2 x 1.5 m
6.7 x 5 ft

2.1 x 2.1 m
6.9 x 6.9 ft

2.5 x 2.5 m
8.2 x 8.2 ft

 2.5 x 2.5 m
8.2 x 8.2 ft

2.5 x 2.5 m
8.2 x 8.2 ft

  2.5 x 2.5 m
8.2 x 8.2 ft
Absorber Size 203 mm (8 in.) 203 mm (8 in.) 305 mm (12 in.) 305 mm (12 in.) 305 mm (12 in.) 457 mm (18 in.)
Environmental Parameters
Operating conditions Controlled indoor environment
Operating temperature range,
Survival temperature range		 18 to 24 °C (65 to 75 °F)
2 to 32 °C (36 to 90 °F)
Operating relative humidity,
Survival relative humidity		 20 – 60%
20 – 60%

Supported Equipment, Software, and Accessories
Position controller ELE-PAC Precision Axis Controller
Supported software SW-A4 Advanced Antenna Acquisition and Analysis (A4)
Remote control via SCPI command set (ELE-PAC & ELE-PMC only)
RF receivers ELE-VFA Vector Field Analyzer™
Select Keysight VNA models
Select Rohde & Schwarz VNA models
Frequency extension Select Virginia Diodes Inc. (VDI) frequency extension modules
Feed antennas ANT-LPF Linear Polarized Feeds
ANT-DPF Dual Polarized Feeds
Custom broadband options available for some applications

*Specifications apply to full quiet zone at a 95% statistical confidence level. Statistical confidence level varies based on the quality and design of chamber and thermal conditions.

System Absorber Kits

Absorber treatment, especially in the area surrounding the feed positioner, is crucial to maintaining ideal quiet zone performance across the operating frequency. The standard configuration includes polyurethane foam absorber, which supports RF power levels of ≤ 1 kW/m2 at full continuous wave (CW) power throughout most of the chamber. A high-power absorber solution is assembled using honeycomb absorber, which can support more than 10 kW/m2 at full CW power in the illumination region of the focused beam lens system. Should it be needed, NSI-MI can upgrade the critical areas to increase the power handling to 10 kW/m2 and beyond. Our experts in anechoic range design and electromagnetic analysis can help you determine which absorber kit is right for your application.

Foam Absorber
Foam Absorber
Standard option
≤ 1 kW/m2
Filter Foam Absorber
Filter Foam Absorber
High-power option
≤ ~4 kW/m2
Honeycomb Absorber
Honeycomb Absorber
Very high-power option
≤ ~10 kW/m2
Honeycomb Absorber with Forced Air Cooling - Front 
Honeycomb Absorber with Forced Air Cooling - Rear 
Honeycomb Absorber with Forced Air Cooling - Exploded-view
Honeycomb Absorber with Forced Air Cooling - Extremely high-power option (air flow dependent)
Our Compact Range Systems are designed to operate with a wide range of popular accessories and support services to meet budget and test needs. These include:
  • Full range of Probes and Standard Gain Horns
  • Additional software to enhance productivity
  • AUT supports, stands and other accessories
  • On-site installation, training and verification by NSI-MI experts
  • Interface Kits to easily integrate a wide variety of common RF equipment, antennas and test devices



RF Options
  • RF Frequency Options: 20, 40, 50 GHz
  • RF Receiver Options: NSI-MI or Customer Supplied
RF Options


Range Automation System Option

Automates common RF reconfiguration tasks to greatly improve range throughput and measurement accuracy.

Modular Architecture


Standard Gain Horn Antennas

Designed to support accurate and repeatable antenna gain calibration measurements.

Standard Gain Horn wr770


Carousel Feed Positioner
Feed Carousel


mmWave RF Upgrade Options
  • mmWave Band: 50–75 GHz module and Feed-SGH set
  • mmWave Band: 60–90 GHz module and Feed-SGH set
  • mmWave Band: 75–110 GHz module and Feed-SGH set
mmWave RF Upgrade Options


Compact Range Feed Options (Single/Dual-Polarized)
  • Linear/Dual Polarized Feeds: 2.6–18
  • Linear/Dual Polarized Feeds: 3.95–26
  • Linear/Dual Polarized Feeds: 3.95–40
  • Linear/Dual Polarized Feeds: 3.95–50
Single Polarized Feed


Software Upgrades
  • Additional A4 Software License
  • Professional Upgrade
  • Enterprise Upgrade
  • Ultimate Upgrade
Software Add-ons