A Different Kind of EMC Measurement
At the Rohde & Schwarz booth at the EMC exhibition in Cologne this January, one demo station was measuring something that the other booths at the exhibition were not.
Not emissions from a DUT. Not compliance margins against CISPR limits. Not radar target detection performance.
The R&S® TS-EMF Portable EMF Measurement System was measuring the electromagnetic field strength of the environment itself — the RF energy already present in the space around the measurement point, coming from all directions simultaneously, across the full frequency range from 9 kHz to 8 GHz.
The headline above the booth: ISOTROPIC EMF MEASUREMENTS UP TO 8 GHZ.
And the update that justified the "up to 8 GHz" claim: the system now covers WiFi 6E — the 6 GHz band that became the most significant expansion of unlicensed spectrum in decades, and the frequency range that made extending EMF measurement coverage from the previous ceiling mandatory for anyone working near modern wireless infrastructure.
R&S TS-EMF · frequency range extended to 8 GHz · covers WiFi 6E, WiFi 7, 5G 6–7.125 GHz · TSEMF-B2E new antenna · Cologne, January 2026
What "Isotropic" Actually Means — and Why It Matters
The word "isotropic" appears in every headline at this booth. It is the technical property that distinguishes EMF measurement from conventional antenna-based spectrum measurement, and understanding it is the entry point to understanding what this system is actually for.
A conventional directional antenna — a log-periodic, a horn, a yagi — receives RF energy preferentially from one direction. Point it at a source, and you measure that source's field strength. Point it away, and you miss it. This is useful for characterizing specific emitters, but it cannot answer the question: what is the total RF field strength at this location, from all sources, in all directions?
An isotropic antenna responds equally to RF energy arriving from any direction and any polarization. The three-axis orthogonal dipole structure inside the sphere housing — three dipoles oriented at 90° to each other, covering X, Y, and Z axes simultaneously — means the measured field value is the true total electric field strength at the measurement point, regardless of where the sources are located or how the antenna is oriented.
This is not a convenience feature. It is the measurement principle required by the international standards for human RF exposure assessment: IEC 62232, ICNIRP guidelines, and national regulations implementing the EU EMF Directive (2013/35/EU). These standards define exposure limits in terms of total field strength at a point — not field strength from one direction. A directional measurement is insufficient for compliance.
R&S TS-EMF · Spectrum Rider FPH · small handheld and large isotropic sphere antennas · FPx-K105 wizard-guided EMF measurement · Cologne, January 2026
The Physical Hardware: FPH + Two Antenna Sizes
The physical system on the demo bench consists of two components connected by the flexible coaxial cable:
The R&S Spectrum Rider FPH — a handheld spectrum analyzer (Model J6 visible on the front panel) — serves as the measurement engine and display. The front panel layout includes a dedicated WIZARD button, which directly accesses the guided EMF measurement workflow without requiring manual configuration of frequency range, detector, or limit line settings. The screen during the demo was showing the Spectrogram mode at Center 4.55 GHz with a 7.3 GHz span — capturing the live electromagnetic environment of the Cologne exhibition hall.
Two different isotropic antenna sizes are visible in the demo photos:
→ Small handheld isotropic antenna (blue-grey sphere with integral handle, foreground left in image4) — designed for close-range measurements near specific equipment or in confined spaces where a large antenna would be impractical
→ Large isotropic antenna (grey sphere, on a telescoping pole or flexible mount, visible on the white tripod) — for open-area EMF surveys where maximum sensitivity is needed over larger distances
Both antennas connect to the same FPH analyzer. The antenna factors — the calibration data that converts the antenna's output voltage to electric field strength in V/m — are stored in the FPH and applied automatically when the EMF measurement mode is active. The displayed result is field strength, not raw signal level, ready for direct comparison against exposure limits.
R&S TS-EMF portable EMF measurement system full booth · Spectrum Rider FPH · isotropic antennas · Cologne, January 2026
The New TSEMF-B2E: Why 8 GHz, Why Now
The screen in image3 specifically highlighted the new R&S® TSEMF-B2E isotropic antenna covering 700 MHz to 8 GHz as the addition that enabled the 8 GHz frequency ceiling. Four bullet points justified this extension:
→ Relevant wireless services covered by 1 isotropic antenna — the TSEMF-B2E's range covers LTE 700/800/900 MHz, all WiFi bands through WiFi 6E (up to 7.125 GHz), 5G FR1 including the new 6 GHz bands, and the 5G NR bands allocated in the 6–7.125 GHz range
→ Supports WiFi6E, WiFi7 and new 5G bands in the range 6 GHz to 7.125 GHz — explicitly addressing the frequency bands that became relevant with the WiFi 6E rollout
→ Complete frequency range 9 kHz to 8 GHz covered by only 3 isotropic antennas — the full measurement range from power frequency emissions through to 5G mmWave precursor bands requires exactly three antenna swaps, not continuous re-calibration
→ "Future proven solution covering new frequency bands of WiFi and 5G" — the deliberate positioning against the ongoing spectrum expansion of both standards
The 6 GHz band opening — first in the US in 2020, then progressively across Europe and Asia — created an immediate gap in existing EMF measurement coverage. Previous isotropic antenna systems typically covered up to 6 GHz, which was adequate before WiFi 6E deployment. Once WiFi 6E access points began operating at 6.0–7.125 GHz, EMF assessments near those installations using older antenna systems were systematically underreporting the total field strength in that band.
For occupational exposure assessments near WiFi 6E infrastructure — office buildings, hospitals, airports, data centers — the gap between "covered up to 6 GHz" and "covered up to 8 GHz" is directly a compliance gap under the EU EMF Directive.
The R&S FPx-K105: EMF Measurement as a Guided Workflow
The screen in image4 described the R&S FPx-K105 software option — the integrated EMF measurement function built into the FPH platform:
→ Definition of customer-specific test scenarios — configurable measurement setups for specific site types (office building, base station near-field, outdoor survey)
→ On-site measurement guided by wizard — the WIZARD button on the front panel launches a step-by-step workflow: select the antenna, select the applicable exposure standard, walk through the measurement positions, confirm each result
→ Direct result presentation on analyzer — field strength in V/m displayed directly, with comparison against the selected standard's reference level
→ Detailed analysis and report generation in R&S Instrument view — the measurement data transfers to software for the structured documentation required for occupational exposure compliance records
The wizard-guided workflow is significant because EMF measurement is frequently performed by personnel who are not RF specialists — safety officers, facility managers, occupational health teams. The WIZARD button compresses the expertise required to produce a valid, standards-compliant EMF measurement from "RF measurement specialist" to "follow the steps on the screen." The instrument carries the knowledge of what measurement parameters the standard requires; the operator provides the physical measurement positions and the judgment about which locations to assess.
The Application Context: Who Actually Needs Isotropic EMF Measurement
The market for isotropic EMF measurement is distinct from the compliance testing market that dominated the rest of the R&S exhibition presence at Cologne. The buyers are not primarily electronics engineers or EMC test labs. They are:
→ Telecommunications infrastructure operators — mobile network operators, tower companies, and neutral host operators who must demonstrate that base station installations comply with ICNIRP exposure limits and national regulations before and after activation
→ Occupational health and safety teams — companies required under EU Directive 2013/35/EU to assess worker exposure to electromagnetic fields in workplaces with significant RF sources (data centers, broadcast facilities, industrial RF heating equipment, medical imaging)
→ Network equipment installers — system integrators deploying WiFi 6E infrastructure in buildings who need to verify that the installed system's combined field strength at occupant locations remains within reference levels
→ Regulatory bodies and notified bodies — authorities verifying that deployed wireless infrastructure complies with the exposure limits specified in national frequency allocation conditions
For all of these use cases, the measurement requirement is identical: total field strength, from all sources, from all directions, at the point of interest, compared against the applicable limit. The isotropic antenna with a calibrated handheld analyzer is the field-deployable implementation of that requirement.
The Broader Signal: EMF Measurement in the 5G and WiFi 6E Era
The R&S TS-EMF demo at Cologne was not showing a new product category. Isotropic EMF measurement has existed for decades. What the demo was showing is that an established measurement category required a hardware upgrade — the TSEMF-B2E antenna — to remain fit for purpose in a changed RF environment.
This pattern recurs throughout T&M: the deployment of a new technology (WiFi 6E, 5G FR1 in 6 GHz, eventually 5G FR2 mmWave) creates a measurement gap in existing instruments, which the instrument vendors must close. The gap here — EMF measurement systems that stopped at 6 GHz meeting infrastructure that starts at 6 GHz — is the kind of subtle compliance exposure that organizations with occupational EMF assessment obligations may not have noticed until an audit or a liability question forced the issue.
The "Future proven solution covering new frequency bands of WiFi and 5G" tagline on the product card is not just marketing language. It is a direct acknowledgment that the 6–8 GHz range is not the end of the spectrum expansion story: WiFi 7 (up to 7.125 GHz), potential future 5G band allocations, and the continuing rollout of 5G FR1 networks will continue to demand EMF measurement capability at frequencies that existing systems may not cover.
The three-antenna system covering 9 kHz to 8 GHz is designed with that trajectory in mind.
System observed: Rohde & Schwarz TS-EMF Portable EMF Measurement System · R&S Spectrum Rider FPH handheld spectrum analyzer · R&S TSEMF-B2E isotropic antenna 700 MHz – 8 GHz · R&S FPx-K105 integrated EMF measurement function · isotropic EMF measurements 9 kHz – 8 GHz · covers WiFi 6E, WiFi 7, 5G FR1 6–7.125 GHz
All photos: Thomas · @SignalByThomas