Active Loop Antennas / Magnetic Field Probes


FMZB 1512 – Active Handheld Receive Loop Antenna
The FMZB 1512 is an active, shielded handheld loop antenna with nearly con- stant antenna factor over the entire frequency range. It can be used for testing according to CISPR, MIL, FCC, EN, ISO, ANSI, ETSI and many other standards.
It can be used for the frequency selective measurement of magnetic fields (or fictive electric field) in the frequency range from 9 kHz to 30 MHz.
The active loop antenna is especially suitable for mobile applications, for instance if used with a handheld spectrum analyzer. Combined with a CISPR 16 EMI-receiver the FMZB 1512 makes a convenient field strength measuring system with low noise and pulse measuring capabilities.
Nominal Frequency Range: | 9 kHz – 30 MHz |
Loop Diameter: | 150 mm |
Connector: | N-female 50 Ω |
Antenna Factor for fict. E – fieldstrength: | 20 dB/m |
Antenna Factor for H – fieldstrength: | -31.5 dB/Ωm |
Attenuator: | 0 – 33 dB |
in 3 dB steps | |
Maximum field strength: | 162 dBμV/m (126 V/m) |
(Switch kE ≥ 44 dB/m) | 110.5 dBμA/m (0.33 A/m) |
Frequency Response: | < ± 3 dB |
Operation time with full Battery Capacity: | > 12 h (typ. 16 h) |
Battery: | NiMH 9.6 V 800 mAh |
Mount: | 22 x 40 mm |
Dimensions: | 165 x 350 x 45 mm |
Weight: | 500 g |

FMZB 1519 C – Active Receive Loop Antenna
Active, shielded Loop Antenna with nearly constant antenna factor over the entire frequency range (9 kHz – 30 MHz), battery driven to minimize disturbance influence from power line.
An overload indicator is activated if an incoming signal approaches or exceeds the 1 dB compression level.
Combined with a CISPR 16 EMI-receiver a convenient field strength measuring system with low noise and pulse measuring capabilities is composed. The robust, milled aluminum housing comes with camera threads to accept a handle or to be mounted on a tripod (e.g. AM 9144).
The FMZB 1519 C is equipped with 10 NiMH-Mignon cells. The Active Loop Antenna FMZB 1519 C can be used for the frequency selective measurement of magnetic fields (of fictious electric field) in the longwave, midwave and shortwave frequency ranges. It can be used for testing according to CISPR (e.g. 16-1-4), MIL, FCC, EN, ISO, ANSI, ETSI and many other standards.
Nominal Frequency Range: | 9 kHz – 30 MHz |
Connector: | N-female 50 Ω |
Antenna Factor for fict. E – fieldstrength: | 20 dB/m |
Antenna Factor for H – fieldstrength: | -31.5 dB/Ωm |
Loop Diameter: | 0.5 m |
Fieldstrength Measuring Range | 31-140 dBμV/m (1 MHz) |
QP-Detector / 9 kHz IF-Bandwidth: | |
Fieldstrength Measuring Range | 11-140 dBμV/m (1 MHz) |
AV-Detector / 200 Hz IF-Bandwidth: | |
Frequency Response: | < ± 1 dB |
VSWR at „Output“: | < 2 |
Operation time with full Battery Capacity: | > 12 h (typ. 20 h) |
Battery: | 12 V NiMH 1.9 Ah |
Operation Indicator: Green LED | > 10.6 V |
Batt. Reserve Indicator: LED yellow | 9.7 V – 10.6 V |
Tripod Mounting Thread (downside): | 3/8″, 1/4″ |
Grip Mounting Thread (upside): | 3/8″ |
Dimensions: | 530 x 590 x 110 mm |
Weight: | 1.9 kg |

FMZB 1519-60 C – Active Receive Loop Antenna
Active, shielded Loop Antenna with nearly constant antenna factor over the entire frequency range (9 kHz – 30 MHz), battery driven to minimize disturbance influence from power line.
An overload indicator is activated if an incoming signal approaches or exceeds the 1 dB compression level.
Combined with a CISPR 16 EMI-receiver a convenient field strength measuring system with low noise and pulse measuring capabilities is composed. The robust, milled aluminum housing comes with camera threads to accept a handle or to be mounted on a tripod (e.g. AM 9144).
The FMZB 1519 C is equipped with 10 NiMH-Mignon cells. The Active Loop Antenna FMZB 1519 C can be used for the frequency selective measurement of magnetic fields (of fictious electric field) in the longwave, midwave and shortwave frequency ranges. It can be used for testing according to CISPR (e.g. 16-1-4), MIL, FCC, EN, ISO, ANSI, ETSI and many other standards.
Nominal Frequency Range: | 9 kHz – 30 MHz |
Connector: | N-female 50 Ω |
Antenna Factor for fict. E – fieldstrength: | 20 dB/m |
Antenna Factor for H – fieldstrength: | -31.5 dB/Ωm |
Loop Diameter: | 0.6 m |
Fieldstrength Measuring Range | 30-140 dBμV/m (1 MHz) |
QP-Detector / 9 kHz IF-Bandwidth: | |
Fieldstrength Measuring Range | 8-140 dBμV/m (1 MHz) |
AV-Detector / 200 Hz IF-Bandwidth: | |
Frequency Response: | < ± 1 dB |
VSWR at „Output“: | < 2 |
Operation time with full Battery Capacity: | > 12 h (typ. 20 h) |
Battery: | 12 V NiMH 1.9 Ah |
Operation Indicator: Green LED | > 10.6 V |
Batt. Reserve Indicator: LED yellow | 9.7 V – 10.6 V |
Tripod Mounting Thread (downside): | 3/8″, 1/4″ |
Grip Mounting Thread (upside): | 3/8″ |
Dimensions: | 630 x 690 x 110 mm |
Weight: | 2.0 kg |

FMZB 1525 – Active Handheld Receive Loop Antenna
The FMZB 1525 is an active, shielded handheld loop antenna with nearly constant antenna factor over the entire frequency range. It can be used for testing according to CISPR, MIL, FCC, EN, ISO, ANSI, ETSI and many other standards.
It can be used for the frequency selective measurement of magnetic fields (or fictive electric field) in the frequency range from 9 kHz to 30 MHz.
The active loop antenna is especially suitable for mobile applications, for instance if used with a handheld spectrum analyzer. Combined with a CISPR 16 EMI-receiver the FMZB 1525 makes a convenient field strength measuring system with low noise and pulse measuring capabilities.
Nominal Frequency Range: | 9 kHz – 30 MHz |
Loop Diameter: | 300 mm |
Connector: | N-female 50 Ω |
Antenna Factor for fict. E – fieldstrength: | 10 dB/m |
Antenna Factor for H – fieldstrength: | -41.5 dB/Ωm |
Maximum field strength: | 125 dBμV/m (1.8 V/m) |
VSWR at Output: | < 2 |
Operation time with full Battery Capacity: | > 12 h (typ. 16 h) |
Battery: | NiMH 9.6 V 800 mAh |
Mount: | 22 x 40 mm |
Dimensions: | 165 x 350 x 45 mm |
Weight: | 540 g |

HFS 1546 – Active Magnetic Field Probe with shielded 50 mm Loop
The HFS 1546 is an active H-field probe for the frequency range 150 kHz to 400 MHz. The small frame diameter of 50 mm enables frequency-selective measurements of low limits, such as for medical implants, up to a frequency of 400 MHz.
The built-in rechargeable battery allows mobile use for up to 10 h.
Frequency Range: | 150 kHz – 400 MHz |
Connector: | N-female 50 Ω |
Loop Diameter: | 50 mm |
Antenna Factor for H – fieldstrength typ.: | -4.0 dB/Ωm |
Maximum Field Strength: | 105 dBμA/m |
Minimum Field Strength typ.: | -13.5 dBμA/m |
Operation time with full Battery Capacity: | > 10 h |
Battery: | NiMH 7.2 V 1000 mAh |
Mounting Tube: | 22 mm |
Total Length: | 610 mm |
Weight: | 890 g |

FSH3D – Isotropic 3-axial RX Loop Antenna
The FSH3D consists of three identical, shielded loop antennas, which are aligned perpendicularly to each other. A shielded unit follows, containing the switching and amplifier circuitry, which is directly connected to the N-male output and fed by the Binder-connector with power supply and logic signals to select the desired loop-axis. The pin assignment is ready for operation with the popular handheld spectrum analyzers FSH3/6 and FSH 4/8 from Rohde & Schwarz. A RF-transparent radome cover protects the FSH3D from dust and moisture. Because of its lightweight construction the FSH3D can be directly mounted to the spectrum analyzer. Alternatively the FSH3D can be held manually at its 50 mm shaft (sweeping method) or attached to a mast or tripod using the 22 mm tube (rotation method or raster method).
Frequency Range (nominal): | 9 kHz – 200 MHz |
Frequency Range (usable): | 9 kHz – 300 MHz |
Connector: | N-female 50 Ω |
Power Supply: | 5 V DC < 100 mA |
Power Supply and Logic Connector: | Binder 99-0421-10-07 Serie 712 |
Antenna Factor for fictional E-fieldstrength: | 42…70 dB/m |
VSWR: | typ. < 1.5 (20 kHz – 50 MHz) |
Decoupling of the axis: | typ. > 20 dB/m |
1 dB Compression at Output: | typ. 118 dBμV |
Loop Diameter: | 112 mm |
Dimensions: | 550 x 146 x 146 mm |
Weight: | 850 g |
Total Length: | 610 mm |
Environmental Conditions: | -10°C – +50°C, IP54 |