EMC Near-field Probes with Wideband Amplifier
Image 1 – from top, H20, H10, H5, E5; wideband amplifier
1 Safety Summary
Do not use the EMC probes to measure devices containing DC voltages higher than 75V or AC voltages
higher than 50V. Though the probes are insulated with solder mask, conformal coating and rubber
coating, sharp metal edges may damage the insulation and cause lethal electrical shocks.
2 Introduction
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The H20, H10, H5, and E5 are magnetic field (H) and electric field (E) probes for radiated emissions and
EMC pre-compliance measurements. They serve to locate and identify potential sources of interference
within the building blocks of electronic assemblies.
The probes act similar to wide bandwidth antennas, picking up radiated emissions from components,
PCB traces, and housing openings that could be emitting RF. Scanning the probe over the surface of a
PCB assembly or housing quickly identifies locations which emit electromagnetic radiation. By changing
to a probe with smaller size, the origination of the emissions can be further narrowed down.
The probes can be used in RF immunity tests by feeding an RF signal into the probe and radiating it into
potentially susceptible circuit sections. Frequency, phase noise, and spectral components can be
measured in conjunction with a low noise preamplifier. The wideband amplifier is connected between
the EMC probe and Spectrum Analyzer to increase the dynamic range of the measurements.
3 Features
Slim design for access between tightly spaced components. Shielded loops to avoid picking up common
mode noise; insensitive to the human hand. Frequency range: up to 6GHz, see coupling plots of the
respective probes SMB connectors to avoid twisting the RF cable when scanning DUTs
Wideband amplifier with 40dB gain
4 Dimensions
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Image 2 - frequency response, H-field probes
Image 3 - frequency response, E-field probe
5 Coupling loss
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Coupling loss was measured on a terminated 50 Ohm stripline on a 1.6 mm thickness FR4 board using a
vector network analyzer.
H20
Image 4 - H20 coupling loss, 30 kHz to 6 GHz, lin.
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H10
Image 5 - H20 coupling loss, 30 kHz to 6 GHz, log.
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Image 6 - H10 coupling loss, 30 kHz to 6 GHz, lin.
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H5
Image 7 - H10 coupling loss, 30 kHz to 6 GHz, log.
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Image 8 - H5 coupling loss, 30 kHz to 6 GHz, lin.
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E5
Image 9 - H5 coupling loss, 30 kHz to 6 GHz, log.
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Image 10 - E5 coupling loss, 30 kHz to 6 GHz, lin.
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Image 11 - E5 coupling loss, 30 kHz to 6 GHz, log.
5.1 Summary
The larger the tip diameter, the lower the coupling loss at frequencies below 1GHz. At frequencies
above 1GHz, the performance in terms of coupling loss of all probes is similar. The H20 has resonances
in the range of 1.3GHz and 4GHz. The H10 has a resonance at 3.1GHz. The smaller the loop, the better
the spatial response.
6 Wideband Amplifier
6.1 Technical Data
Input: 50 Ohm, SMA
Output: 50 Ohm, SMA
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Nominal supply Voltage: 4.5 - 5V, typ. 210mA, Mini-USB-B connector
Maximum supply voltage: 5.5V
Maximum input power: -10dBm
1dB output compression point @ 2GHz: +20dBm
Reverse isolation S12, 0.1 …6GHz: 40dB
Noise Figure @ 2GHz: 5 dB
Gain:
Wideband amplifier gain
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Image 12 - Wideband amplifier gain, 30 kHz to 6 GHz, lin.
Image 13 - Wideband amplifier gain, 300 kHz to 10 MHz, lin.
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Image 14 - Wideband amplifier input return loss, IS11I, 300 kHz to 3 GHz, lin.
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Image 15 - Wideband amplifier output return loss, IS22I 300 kHz to 3 GHz lin.
7 Application
Radiated EMC measurement
RF immunity testing
Contactless (load free) relative measurement of RF signal chains
Contactless (load free) relative measurement of oscillators, modulators, etc.
8 Spectrum analyzer settings
If the probes are used without a wideband preamplifier, set the input attenuation to 0dB and turn on
the internal preamplifier, if available on your spectrum analyzer. Furthermore, you can increase the
dynamic range and sensitivity by reducing frequency span, resolution bandwidth, and video bandwidth.
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