AIST:Electromagnetic fields section, Electromagnetic waves division, NMIJ

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Electromagnetic Fileds Section

This page is published by the electromagnetic fields section, Electromagnetic waves division, NMIJ/AIST. Role of this section is to investigate techniques in the precision electromagnetic-field measurement and carry out the antenna calibration for precision measurements. The purpose of this page is to introduce avilable calibrations and the research topics.

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Avilable calibration services of the antenna and probe are listed below. Please contac us or Metrology Management Center in advance of the calibration.

Calibration of antennas
Calibration factor	Antenna type	Frequency	Expanded uncertainty(k=2)	Calibration type
Antenna factor (Loop antennas)	Loop antenna(1)	At 8 frequencies from 9 kHz ` 30 MHz(2)	9, 10 kHz: 3.2 dB 150 kHz: 2.2 dB 500 kHz, 1, 5 MHz: 2.0 dB 15 MHz: 1.8 dB 30 MHz: 1.6 dB	NMIJ calibration
Antenna factor (Dipole antenna)	Dipole antenn with the fixed-length elements(3)	At 24 frequencies from 30 MHz ` 1 GHz(4)	0.7 dB	NMIJ calibration jcss
Gain	Horn antenna(5)	1.00, 1.05, 1.15 GHz	0.36 dB	NMIJ calibration
		1.15, 1.50, 1.70 GHz	0.36 dB
		1.70, 2.45, 2.60 GHz	0.25 dB
		2.60, 3.27, 3.95 GHz	0.25 dB
		3.95, 4.9, 5.85 GHz	0.23 dB
		5.85, 7, 8.2 GHz	0.24 dB
		8.2, 10, 12.4 GHz	0.26 dB
		12.4, 15.2, 18 GHz	0.26 dB
		18, 22, 26.5 GHz	0.36 dB
		26.5 GHz	0.31 dB
		33 GHz	0.36 dB
		40 GHz	0.41 dB
Electric field strength	Electric field probe(6)	1.7, 2.45, 2.60 GHz	0.51 dB	NMIJ calibration

(1)Requirements for the antennas under calibration (AUC) are listed below.

The diameter is from 50 cm to 60 cm.
The diameter of antenna element is less than 23 mm.
The feeding connector is PC-7 (Adaptor is available).
The between transmission loop antenna (whose diameter is 10 cm) and user's loop antenna is more than - 60 dB and less than - 10 dB at 80 cm.
You need to ask our person in charge, beforehand.

(2)9 kHz, 10 kHz, 150 kHz, 500 kHz, 1 MHz, 5 MHz, 15 MHz, 30 MHz
(3)AUC is required that;

24 elements should be a half-wavelenth of the resonant frequency listed in (4).
AUC has a Type-N (female) connector.

(4)30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200, 300, 400, 500, 600, 700, 800, 900, 1000 MHz
(5)Contact us for the antenna discriptions in advance of the calibration.
(6)Contact us for the probe discription in advance of the calibration.

Contact information:

Electromagnetic fields section,
Electromagnetic waves division,
National Metrology Institute of Japan
National Institute of Advanced Industrial Sciense and Technology

Room 317, Tsukuba central 3
1-1-1, Umezono, Tsukuba 305-8563 Japan
Tel: +81-29-861-4177, Fax: +81-29-861-4957
E-mail:emf-cal@m.aist.go.jp