Antenna Kit: 1 - 40 GHz

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ANK-140 Portable EMC Antenna Kit (1–40 GHz) — Frequently Asked Questions

1. What is the Com-Power ANK-140 and what is it primarily used for?
The ANK-140 is a portable microwave EMC antenna kit covering the full 1 GHz to 40 GHz frequency range in a single rolling carrying case. It is designed for pre-compliance and qualification-level radiated emissions testing of electronic products at offsite locations, customer facilities, or test chambers where a dedicated lab is not available. The kit bundles everything a technician needs for microwave-band EMC measurements — two broadband horn antennas, matching preamplifiers, a comb generator for test-site verification, a near-field probe set for EMI troubleshooting, and all required coaxial cables.

2. What is included in the ANK-140 kit?
• AH-118 Double Ridge Horn Antenna (700 MHz – 18 GHz)
• AH-840 Double Ridge Horn Antenna (18 GHz – 40 GHz)
• PAM-118A Low-Noise Preamplifier (500 MHz – 18 GHz)
• PAM-840A Microwave Preamplifier (18 GHz – 40 GHz)
• CGO-51000 Comb Generator (1 GHz – 40 GHz, broadband radiated reference source)
• PS-500 Near-Field Probe Set (H-field and E-field probes for EMI debug)
• Measurement cables (N-type and BNC) for a typical 3-meter radiated EMC test setup
• Compartmentalized rolling carrying case with custom foam cutouts and pull handle, airline-transportable as luggage
• Individual calibration certificates for each antenna and preamplifier (NIST-traceable)
Optional: AT-812 or AT-120 tripod (with or without ATC-120 tripod case)

3. Which EMC standards and test bands does the ANK-140 support?
• FCC Part 15 Subpart B, C, E (unintentional radiators, intentional radiators, U-NII) radiated emissions up to 40 GHz
• FCC Part 30 (Upper Microwave Flexible Use Service) 24, 28, 37, 39 GHz
• CISPR 32 / EN 55032 ITE/multimedia emissions above 1 GHz (up to 6, 18, or 40 GHz depending on highest internal clock)
• CISPR 16-1-4 site validation above 1 GHz (SVSWR)
• MIL-STD-461G RE103 radiated emissions for military equipment (to 40 GHz)
• RTCA DO-160 Section 21 airborne equipment emissions
• 3GPP TS 38.101-2 5G NR FR2 emissions (n257, n258, n260, n261)
• ETSI EN 301 489 wireless product immunity/emissions
• ISO 17025 pre-compliance scans before formal certification

4. Why does the ANK-140 use two separate horn antennas?
The 1–40 GHz range spans more than five octaves — no single passive antenna delivers optimal gain, VSWR, and field performance across that entire range. The AH-118 (700 MHz – 18 GHz, up to 300 W) is a broadband double ridge guide horn optimized for the sub-18 GHz band with low VSWR and consistent gain. The AH-840 (18–40 GHz, 10 W with adapter / 200 W direct waveguide) uses a precisely tuned waveguide and 2.92 mm K-type connector designed for millimeter-wave performance. Together they give full 1–40 GHz coverage with the antenna best-suited for each sub-band. A 10–30 second antenna swap between bands is a much smaller operational cost than the compromised performance a single wideband antenna would deliver.

5. Why are preamplifiers included with this kit?
At microwave frequencies, cable losses are significant — a typical 3-meter test cable can have 3–8 dB of loss at 18 GHz and 6–15 dB at 40 GHz. If the receiver’s internal noise floor is only 10–15 dB below the emission you’re trying to measure, the combination of antenna factor + cable loss can bury the EUT signal below receiver noise. Placing a low-noise preamplifier (PAM-118A for 500 MHz–18 GHz and PAM-840A for 18–40 GHz) right after the antenna, before the long cable, boosts the signal before the cable loss degrades it. This gives the full 3-meter setup a noise floor equivalent to a much shorter cable run, often the difference between detecting a low-level emission and missing it entirely.

6. What is the CGO-51000 Comb Generator and why is it in this kit?
The CGO-51000 is a battery-powered broadband reference signal source that radiates a “comb” of known harmonically-related tones from 1 GHz to 40 GHz. Comb generators are not used to test EUTs — they are used to verify the entire measurement chain: receiver, cables, connectors, preamplifier, antenna, and positioning. Running a quick comb generator check before each test session catches bad cables, loose connectors, failing preamplifiers, or drifted calibrations before they corrupt an expensive EUT measurement. Because annual calibration doesn’t prevent equipment failure between cycles, many labs run comb checks daily or weekly. Battery operation avoids any external cable that could interfere with the radiated reference signal.

7. What is the PS-500 Near-Field Probe Set used for?
The PS-500 contains a set of small H-field and E-field probes used to locate the source of EMI emissions on a circuit board, cable, enclosure, or harness. When the ANK-140’s horn antennas detect an EUT emission that exceeds a limit, the PS-500 probes let the engineer “sniff” the product up close to find exactly which component, trace, cable, or seam is radiating. This is critical during design-phase debug and root-cause analysis — far-field antenna measurements tell you the EUT is emitting, but near-field probes tell you where so you can apply shielding, filtering, or layout changes.

8. Who uses the ANK-140 and what real-world products does it test?
• 5G NR FR2 product manufacturers: base stations, small cells, CPE, handsets operating at 24, 28, 37, 39 GHz
• Automotive suppliers: 24 GHz SRR, 77 GHz long-range radar harmonic coverage, in-vehicle wireless
• Satellite and SATCOM: K/Ka-band user terminals, VSAT, gateway radios
• Defense contractors: SATCOM, radar, electronic warfare, C4ISR equipment
• Wireless consumer electronics: Wi-Fi, Bluetooth, cellular LTE/5G devices
• Medical device OEMs: mmWave imaging, radar-based monitoring, IEC 60601-1-2 compliance
• Aerospace avionics: DO-160 Section 21 microwave emissions
• EMC consultants and third-party test engineers: offsite testing at customer facilities
• ISO 17025 compliance labs: portable backup/supplementary test capability
• Field service technicians: on-site troubleshooting of installed RF systems

9. How does the ANK-140 compare with other Com-Power antenna kits?
• vs. ANK-310 (30 MHz – 1 GHz): complementary low-band kit for biconical/log-periodic work. ANK-140 is above 1 GHz; ANK-310 is below
• vs. ANK-318 (25 MHz – 18 GHz): ANK-318 extends from the low end up through K-band, but stops at 18 GHz. ANK-140 starts at 1 GHz and covers the mmWave 18–40 GHz range that ANK-318 does not
• vs. ANK-910L (9 kHz – 1 GHz, active loop): different application — ANK-910L covers low-frequency H-field, ANK-140 covers microwave and mmWave
• vs. ANK-910M (9 kHz – 1 GHz, monopole): different application — ANK-910M is for E-field monopole work at DO-160/MIL-STD frequencies
For complete 9 kHz – 40 GHz coverage, pair ANK-140 with either ANK-910L (emissions + CISPR) or ANK-910M (MIL-STD/DO-160)

10. What is unique about the ANK-140 vs. buying each piece separately?
Three practical advantages beyond the list price:
• Kit pricing is typically lower than the sum of individual components
• Custom-cut compartmentalized carrying case with wheels and pull handle keeps everything organized, protected during transport, and airline-transportable as luggage — no separate shipping crates for each antenna
• Matched calibration date on all items simplifies annual recalibration scheduling and keeps the kit’s traceability aligned
Critically, every item is also available for individual purchase if you only need to replace one piece later or if you’re adding capability to an existing setup.

11. Can the ANK-140 be used for immunity (susceptibility) testing, not just emissions?
Partially. The AH-118 and AH-840 horn antennas can transmit for immunity testing and can handle significant power (AH-118 up to 300 W, AH-840 up to 200 W direct waveguide). However, the ANK-140 does not include a power amplifier — the included PAM-118A and PAM-840A are low-noise preamplifiers for receive-only, not high-power amplifiers for transmit. For radiated immunity testing per IEC 61000-4-3, ISO 11452-2, or MIL-STD-461 RS103, you would need to pair the ANK-140 horns with an appropriate external high-power RF amplifier (such as a 50 W, 200 W, or larger microwave power amp). The kit as supplied is optimized for emissions measurement.

12. How is the ANK-140 calibrated and what documentation comes with it?
Each component in the kit is individually calibrated:
• Horn antennas (AH-118, AH-840) — calibrated per ANSI C63.5 or SAE ARP958 with gain/antenna factor vs. frequency, NIST-traceable
• Preamplifiers (PAM-118A, PAM-840A) — calibrated gain and noise figure vs. frequency
• Comb generator (CGO-51000) — calibrated output level vs. frequency
• Near-field probes (PS-500) — calibration data where applicable
Each item ships with its own individual calibration certificate. ISO 17025 accredited calibration is available on request. Annual recalibration is recommended for maintained traceability.

13. What should I watch for when using the ANK-140 at high frequencies?
• Cable loss is severe above 18 GHz — keep coax runs short and use 2.92 mm (K-type) rated cables at the mmWave end; SMA cables degrade rapidly above 18 GHz
• Connector torque — use a calibrated torque wrench (8 in-lb for 2.92 mm); finger-tight is not sufficient
• Connector cleanliness — inspect and clean connectors before every mate; dust or damaged pins produce 3–5 dB errors at 40 GHz
• Ambient interference — wideband microwave scans pick up cellular, Wi-Fi, 5G, and satellite signals; perform baseline ambient scans before every test
• Preamplifier overload — the PAM-118A/PAM-840A have finite 1-dB compression; use attenuation if strong ambient or EUT emissions threaten to overload them
• Absorber limitations — chamber absorbers must be rated to 40 GHz; validate before relying on the chamber
• Far-field distance — at microwave frequencies, even 1 m is usually far-field for typical EUTs

14. What real-world debug scenarios benefit from the ANK-140?
• Scenario 1 — 5G FR2 module certification: Product fails CISPR 32 at 28 GHz during formal testing. Take ANK-140 back to the design lab, use AH-840 to reproduce the emission, use PS-500 probes to localize the source to a specific package lead, apply shielding, retest
• Scenario 2 — Automotive 24 GHz radar sensor: Supplier reports intermittent compliance failures. ANK-140 at the production facility runs a quick comb-generator verification, then scans with AH-118 to confirm the failure, localizes with PS-500 to a manufacturing variance, resolves the issue
• Scenario 3 — Offsite DO-160 pre-compliance: Aerospace avionics at customer facility. ANK-140 provides full 1–40 GHz coverage in one piece of luggage; CGO-51000 verifies setup integrity before every measurement
• Scenario 4 — Satellite terminal characterization: K/Ka-band earth station emissions testing at a remote site; ANK-140 covers both K and Ka bands in one kit

15. What are the ANK-140’s key design advantages?
• Complete 1–40 GHz coverage in a single portable case
• Two broadband double ridge horn antennas optimized for their respective sub-bands
• Two matching low-noise preamplifiers dramatically improve measurement sensitivity at range
• CGO-51000 comb generator gives built-in 1–40 GHz test-setup verification
• PS-500 near-field probe set for on-the-spot EMI source localization
• Rolling carrying case with custom foam — airline-luggage compatible
• All required cables included for a typical 3-meter radiated test setup
• Every component individually calibrated with NIST-traceable certificates
• All items available individually for replacement or expansion
• Optional AT-812 or AT-120 tripod for proper antenna height/positioning
• 3-year standard warranty on component products
• Consolidates multiple individual purchases — usually at lower total cost

16. When should engineers select the ANK-140 over other options?
Select the ANK-140 when any of the following applies:
• You perform microwave and mmWave EMC testing (1–40 GHz) in the field, at customer sites, or across multiple internal lab locations
• You test 5G NR FR2, K/Ka-band satellite, 24/77 GHz automotive radar, Wi-Fi 6/7, or sub-6 GHz + mmWave products
• You run an ISO 17025 lab needing backup or portable capability alongside a permanent chamber
• You are a consulting EMC engineer doing offsite pre-compliance at client facilities
• You need DO-160 Section 21, MIL-STD-461 RE103, or FCC Part 30 coverage up to 40 GHz
• You want to verify your radiated test setup with a comb generator as part of daily lab QA
Choose the ANK-310 for 30 MHz – 1 GHz FCC/CISPR work. Choose the ANK-318 for a broader 25 MHz – 18 GHz single-kit solution (does not include the mmWave AH-840). Choose the ANK-910L or ANK-910M for low-frequency (9 kHz – 1 GHz) applications including CISPR H-field or MIL-STD E-field.