1st Radiowave Test Facility

The radiowave test facility is used for analyzing the radiowave properties of antennas and radiowave sensors to be on board launch vehicles and spacecraft. The radiowave properties analysis is performed by transmitting radiowaves from various directions to an antenna or a radiowave sensor mounted on a rotary table and measuring their reception sensitivity.
The 1st Radiowave Test Facility(1st anechoic chamber) is the largest RF-shielded radiowave test room in Japan. It is an air-conditionable ISO14644 class 8 cleanroom, comprising a “far-field measurement system” with a distance of 24.6 m between transmitting and receiving equipment and a “compact range system” which simulates far-field measurement using a reflector even when a limited distance can be secured between transmitting and receiving equipment.

System Architecture

1st Radiowave Test Facility System Architecture

Specification

1st anechoic chamber dimensions 24.5 m (W) × 22.4 m (H) × 39.2 m (D)
radiowave absorption 450 MHz~10 GHz or more -22 dB~-45 dB or less
electric field shielding 90 kHz~30 GHz against electric field -80 dB~-60 dB
compact range system test zone horizontally cylindrical space of 3.6 m (dia) × 3.6 m (L)
test zone properties amplitude taper 1.0 dB or less
phase variation 10° or less (1 GHz~18 GHz), 20° or less (18 GHz~94 GHz)
freq. range 1 GHz~94 GHz
far-field measurement system test zone spherical space of 6 m dia. centered around a point 11 m above the center of the rotary table
distance bet.
transmitting and receiving equipment		 24.6 m fixed
freq. range 450 MHz~26.5 GHz

Actual Applications

antenna on GCOM-W, antenna on Epsilon Launch Vehicle, Quasi-zenith Satellite, etc.

PUBLIC APPLICATIONS: evaluation tests on equipment related to satellite communication, etc.