ETS Lindgren Anechoic Chamber Provides an electromagnetically quiet environment for measuring the radiating properties of a device-undertest Enclosed by an external metallic shielding to provide isolation from the outside environment Interior lied with radio frequency/microwave absorbers and ferrite tiles to minimize unwanted multiple internal signal reflections inside the chamber To emulate a free space environment for testing Application examples: Characterization of intentional radiators or the scattering of electromagnetic energy, such as antenna radiation pattern and radar cross section (RCS) measurements Determining the level of radiation/noise from unintentional radiators. For instance, electromagnetic interference (EMI) measurement for digital devices/systems Determining the level of immunity of an electronic device/system when exposed to ambient electromagnetic signal/noise
Electromagnetic Anechoic Chamber Features Electromagnetic measurement and characterization from 30 MHz to 18 10 m measurement range Biggest chamber within ~500 miles in the area Capable of accommodating small UAV of up to 1,100 lbs ~100 db shielding from external environment Potential Applications: Antenna performance characterization EMI/EMC measurement Radar cross section study Others
Chamber Floor Plan 11.6 m Data acquisition system and device controller Reference RX antenna Absorbers AUT (TX antenna) 7.3 m Walkway Turntable 1.2 m x 2.1 m Single leaf door Connector Panel 2.4 m x 2.4 m Double leaf door
Chamber Specifications Chamber Dimensions Wall Shielding Door Shielding Absorber 11.58 m x 7.29 m 7.36 m (interior, with 0.4 m raised floor) Magnetic field: 20 db @ 1 khz, 56 db @ 10 khz, 100 db @ 200 khz Electric field: 100 db from 200 khz to 50 MHz Plane wave: 100 db from 50 MHz to 1 Microwave: 100 db @ 18 Magnetic field: 20 db @ 1 khz, 70 db @ 14 khz, 100 db @ 200 khz Electric field: 90 db @ 1 khz, 120 db from 10 khz to 50 MHz Plane wave: 120 db from 50 MHz to 10 Microwave: 100 db from 10 to 26, 80 db @ 40 Power handling: 775 W/m 2 Attenuation: >10 db from 30 MHz to 18 Normal incidence
Chamber Specifications Ferrite Tiles Site-VSWR Field Uniformity Free-space Normalized Site Attenuation CTIA Ripple Testing Connector Panel Handle up to 200 V/m of continuous RF field Quiet zone test volume: 1.5 m Test frequency range: 1 18 Measured performance: 3.37 db Satisfied CISPR 16-1-4 performance requirement 6 db Test plane: 1.5 m x 1.5 m Test frequency range: 80 MHz to 1 Field level evaluated: 5.4 V/m Measured performance: < 4.2 db Satisfied IEC 61000-4-3 standard 6 db Test range: 3 m Test diameter volume: 1.5 m Measured performance: ± 3.9 db deviation from theoretical value specified in CISPR 16-1-4 (Ed.3) Eligible for CTIA Authorized Testing Laboratory (CATL) filing Test data available upon request 3 N-type connectors 6 FSMA penetration kit 6 FC-type optical connectors 2 K-type connectors 2 ST penetration kit
List of Equipment/Tool Hardware Agilent N5230C PNA-L 4-port Network Analyzer (10 MHz 20 ) Agilent 8052D calibration kit Agilent E4446A PSA Spectrum Analyzer (3 Hz 44 ) ETS-Lindgren Standard Antennas (see next slides) ETS-Lindgren 7-TR/POL Antenna Tower (max. load: 13.5 kg) ETS-Lindgren 2090 Dual-Device Controller ETS-Lindgren 4340 Shielded Camera System Bosch DLK Digital Distance Measurer Skil MT 8201 Self-Leveling Cross Line Laser Assorted RF cables and connectors/adaptors Software Ansys HFSS v14 Agilent ADS 2011.01 CST Microwave Studio MATLAB 2011b
Available Standard Antennas # Antennas Designated frequency Start Stop ETS-Lindgren Mini-Bicon* (cage) 3180B 30 MHz 1 Mini-Bicon* (conical) 3180B 30 MHz 3 End-Fed Mini-Bicon 3183 1 18 BiConiLog 3142C (x2) 26 MHz 3 Log-Periodic Dipole Array 3148 200 MHz 2 Dual-Pol. Log-Periodic 3145BDP 100 MHz 1.1 Double-Ridged Horn 3117 1 18 Quad-Ridged Horn 3164-06 300 MHz 6 Quad-Ridged Horn 3164-05 2 18 Pasternack WR159 Horn PE9860/NF-15 4.9 7.05 WR187 Horn PE9861/NF-15 3.95 5.86 Narda WR187 Horn 643 3.95 5.85 WR430 Horn 645 1.7 2.6 Scientific Atlanta WR137 Horn 12-5.8 5.85 8.2 WR187 Horn 12-3.9 3.9 5.85 WR650 Horn 12-1.1 1.12 1.7 30 MHz 100 MHz Measurement frequency 300 MHz 1 3 6 18 ^ Data sheet available upon request * Single antenna with two configurations Quad-Ridged Horn Dual-Pol. Log-Periodic Mini-Bicon