HFRA 1356 - Passive Magnetic TX Loop Antenna - Absolute EMC
HFRA 1356
Passive Magnetische Sende-Rahmenantenne Passive Magnetic TX Loop Antenna
Beschreibung:
Die HFRA 1356 ist eine auf Resonanz
abgestimmte passive Rahmenantenne.
Der Rahmen, bestehend aus zwei kreis-
runden Windungen, ist gegen E-Felder
geschirmt. Die Antenne ist zur effizienten
Erzeugung definierter Magnetfelder bei
13,56 MHz vorgesehen, zum Beispiel
beim Testen von Nahfeldkommunikati-
onskomponenten (NFC) oder Messungen
im RFID-Bereich. NFC wird in den Stan-
dards
ISO 18092,
ECMA 340,
ETSI TS 102 190 beschrieben und dient
zur Daten?bertragung auf Strecken von
einigen Zentimeter.
Signalgeneratoren haben oft Aus-
gangspegel von ca. 16 dBm. Damit lassen
sich Feldst?rken von etwa 1 A/m erzeu-
gen. Mit 25 Watt Generatorleistung l??t
sich kurzzeitig die maximal m?gliche
Feldst?rke von 25 A/m erreichen.
Die Buchse ,,Input" wird mit dem Signal-
generator verbunden, w?hrend die Buch-
se ,,Monitor" zur Kontrolle des Rahmen-
stroms genutzt wird. Der Rahmenstrom
wird als Spannungsabfall ?ber dem in der
Antenne eingebauten Widerstand mit
einem 50 Spannungsme?ger?t ermittelt
(z.B. Spektrumanalysator). Verwendet
man hochohmige Messger?te wie z.B.
manche HF-Voltmeter oder Oszilloskope)
so muss ein 50 Abschluss parallel ge-
schaltet werden.
Description: The HFRA 1356 is a passive loop antenna which is matched to a resonance frequency of 13.56 MHz. The antenna is shielded against electric fields. The purpose of the antenna is to produce defined magnetic fields at 13.56 MHz efficiently, i.e. to test near field communication devices (NFC) or RFID equipment. NFC issues are described in the standards ISO 18092, ECMA 340, ETSI TS 102 190. NFC is used for data communication on distances of a few centimeter. Signal generators are often rated with an output power level of approx. 16 dBm. This is sufficient to generate typ. 1 A/m with HFRA 1356. With 25 Watt generator power a magnetic fieldstrength of 25 A/m can be reached for short time operation.
Connect a signal generator to the "Input" port to generate a magnetic field and control the loop current at the "Monitor"-port. The current through the loop is measured as a voltage drop along the built in resistor with a 50 voltmeter (i.e. a spectrum analyzer) If you use a device with an input with high impedance like some oscilloscopes or RF-voltmeters it is necessary to switch a 50 load in parallel.
Datasheet
1/6
ABSOLUTE EMC Llc. Covering sales in North America United States, Mexico, & Canada
Rev. B
absolute- Phone:703-774-7505 info@absolute-
1128.060618
HFRA 1356
Eine gemessene Spannung von 32 mV bzw. 90 dB?V am Kontrollausgang entspricht einer magnetischen Feldst?rke von 1 A/m im Rahmenzentrum. Der Rahmenstrom ist streng proportional zur erzeugten Magnetfeldst?rke, z.B. f?r H = 6 A/m betr?gt die ,,Monitor" Kontrollspannung 192 mV oder 105.6 dB?V.
Die maximal zul?ssige dauerhafte Kontrollspannung betr?gt 640 mV, dies entspricht einer Feldst?rke von 20 A/m. Bei h?heren Werten werden die eingebauten Bauelemente ?berhitzt. Das Signal vom Leistungsgenerator darf niemals an die ,,Monitor"-Buchse angelegt werden um die Zerst?rung von Widerst?nden zu vermeiden. Die Umrechnung von magnetischer Feldst?rke in fiktive elektrische Feldst?rke ist frequenzunabh?ngig 51,5 dB =20?log (377 ) 1 A/m 377 V/m 0 dBA/m 51,5 dBV/m 120 dB?A/m 171,5 dB?V/m
A measured voltage of 32 mV or 90 dB?V
at the "Monitor" output equals a magnetic
field strength of 1 A/m in the center of the
loop.
The loop current is strictly proportional to
the generated magnetic field strength. A
magnetic field strength of H = 6 A/m is for
instance generated if the monitored volt-
age is 192 mV or 105.6 dB?V.
The maximum allowed monitor voltage is
640 mV which corresponds to field
strength of 20 A/m. Larger signal ampli-
tudes will overheat the internal compo-
nents of the antenna.
Do never apply the signal of the power
generator to the "Monitor" output connect-
or, otherwise the HFRA 1356 will be dam-
aged.
The conversion between magnetic field
strength and fictive electric field strength is
independently
of
frequency
51.5 dB =20?log (377 ).
1 A/m 377 V/m 0 dBA/m
51.5 dBV/m 120 dB?A/m
171.5 dB?V/m
Technische Daten: Nennfrequenz: Monitorspannung f?r H = 1 A/m: Max. Magn. Feldst?rke: Max. Kontrollspannung:
Magn. Nennfeldst?rke: Impedanz Eingang und Monitor: Stehwellenverh?ltnis am Eingang: Rahmendurchmesser: Windungszahl: Anschl?sse: Maximale Dauerleistung am Eingang: -3 dB Bandbreite: Montage (Stativgewinde): Material: Messing, vernickelt
Gewicht:
13.56 MHz 32 mV / 90 dB?V
25 A/m, 1 min. 800 mV / 118 dB?V,
1 min. 20 A/m continuous
50 < 2
250 mm 2
BNC 16 W / 42 dBm
370 kHz 3/8"UNC Messing, vernickelt brass, nickel plated
0.4 kg
Specifications: Nominal frequency:
Monitor voltage for H = 1 A/m: Maximum magnetic field strength:
Max. monitor voltage :
Nominal magnetic field strength Impedance at ,,Input" and ,,Monitor":
VSWR at ,,Input":
Loop diameter: Number of turns:
Terminals: Max. power dissipation at "Input":
-3 dB bandwidth: Mount (camera thread):
Material:
Weight:
1128.060618
Datasheet
2/6
ABSOLUTE EMC Llc. Covering sales in North America United States, Mexico, & Canada
Rev. B
absolute- Phone:703-774-7505 info@absolute-
HFRA 1356
Magnetfeldst?rke in Rahmenmitte
Monitorspannung an 50
Generator- Magnetfeldst?rke Monitorspannung
spannung in Rahmenmitte
an 50
an 50
Generatorspannung an
50
Generatorleistung an 50
Magnetic Fieldstrength in Loop
Center
dB?A/m
120 135.6 146
Monitor Voltage across
50
Generator Magnetic Field-
Voltage strength in Loop
across 50
Center
dB?V
dB?V
A/m
90
123.0
1
105.6
138.6
6
116
149.0
20
Monitor Voltage across 50
mV 32 192 640
Generator Generator Pow-
Voltage across er across 50 50
V
W
1.41
0.04
8.46
1.4
28.4
16
VSWR of HFRA 1356 8
'1356.log' 7
6
5
4
3
2
1 13.35 13.4 13.45 13.5 13.55 13.6 13.65 13.7 13.75 13.8
Frequency [MHz]
VSWR at Input
1128.060618
Datasheet
3/6
ABSOLUTE EMC Llc. Covering sales in North America United States, Mexico, & Canada
Rev. B
absolute- Phone:703-774-7505 info@absolute-
HFRA 1356
1000
HFRA 1356
Magnetic fieldstrength [mA/m]
1128.060618
100
10
0
5
10
15
20
25
30
35
40
45
50
Distance [cm]
1 V/m 2.653 mA/m -51.5 dBA/m 0 dBV/m 120 dB?V/m 68.5 dB?A/m
1 A/m 377 V/m 0 dBA/m 51.5 dBV/m 120 dB?A/m 171.5 dB?V/m
Die folgende Tabelle zeigt die magnetische Feldst?rke in Abh?ngigkeit von der Entfernung zum Rahmenzentrum. Des Weiteren ist die aus der magnetischen Feldst?rke berechnete fiktive elektrische Feldst?rke zu finden.
The following table shows the magnetic field strength depending on the distance to the center of the loop. Furthermore you can find the fictive electric field strength derived from the magnetic field strength.
Datasheet
4/6
ABSOLUTE EMC Llc. Covering sales in North America United States, Mexico, & Canada
Rev. B
absolute- Phone:703-774-7505 info@absolute-
HFRA 1356
Distance
[cm] 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
Datasheet
32 mV monitoring output voltage = 90 dB?V monitor voltage
(50 RF voltmeter)
H
[mA/m] 1000 990.1 961.3 916.3 859.0 793.6 724.3 654.5 586.9 523.4 464.9 411.9 364.5 322.5 285.5 253.1 224.7 199.8 178.1 159.1 142.5 127.9 115.1 103.9 93.96 85.19 77.43 70.53 64.39 58.92 54.02 49.64 45.70 42.15
H
[dBA/m] 0.000 -0.087 -0.343 -0.759 -1.320 -2.008 -2.802 -3.682 -4.628 -5.624 -6.653 -7.704 -8.765 -9.828 -10.89 -11.93 -12.97 -13.99 -14.99 -15.97 -16.92 -17.86 -18.78 -19.67 -20.54 -21.39 -22.22 -23.03 -23.82 -24.59 -25.35 -26.08 -26.80 -27.50
E
[dBV/m] 51.50 51.41 51.16 50.74 50.18 49.49 48.70 47.82 46.87 45.88 44.85 43.80 42.73 41.67 40.61 39.57 38.53 37.51 36.51 35.53 34.58 33.64 32.72 31.83 30.96 30.11 29.28 28.47 27.68 26.91 26.15 25.42 24.70 24.00
E
[dB?V/m] 171.5 171.4 171.2 170.7 170.2 169.5 168.7 167.8 166.9 165.9 164.8 163.8 162.7 161.7 160.6 159.6 158.5 157.5 156.5 155.5 154.6 153.6 152.7 151.8 151.0 150.1 149.3 148.5 147.7 146.9 146.2 145.4 144.7 144.0
5/6
ABSOLUTE EMC Llc. Covering sales in North America United States, Mexico, & Canada
Rev. B
absolute- Phone:703-774-7505 info@absolute-
1128.060618
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