Rohde and Schwarz HFH2-Z2 Broadband Active Loop Antenna, 30 MHz

The Rohde & Schwarz HFH2-Z2 is a broadband active loop antenna engineered for magnetic field strength measurements across the LF, MF, and HF bands from 8.3 kHz to 30 MHz. It delivers high sensitivity down to <–70 dB(µA/m/Hz) above 1.5 MHz, enabling detection of extremely weak fields while maintaining a wide dynamic range up to 85 dB(µA/m) in normal mode. The antenna exhibits virtually constant antenna factor across its entire operating range, ensuring precise and repeatable measurements in EMI testing per CISPR, MIL, FCC, ANSI, and ETSI standards.

An integrated attenuator mitigates distortion in strong-field environments, while an internal RF detector with threshold circuIt has overload protection. The 590 mm loop diameter balances sensitivity and portability. Source impedance is 50 Ω with current draw <40 mA at ±10 V.

Operating temperature range spans −10°C to +55°C, with storage capability to −25°C to +70°C.

Technical Specifications

• Frequency Range: 8.3 kHz to 30 MHz


• Loop Diameter: 590 mm


• Source Impedance: 50 Ω


• Current Drain (±10 V): <40 mA


• Minimum Field Sensitivity: 1.5 MHz to 30 MHz)


• Maximum Field Strength: 85 dB(µA/m) (normal mode)


• Operating Temperature: −10°C to +55°C


• Storage Temperature: −25°C to +70°C


• Dimensions: 596 mm × 90 mm × 822 mm

Key Features

• Virtually constant antenna factor for accurate field measurements across the full frequency range


• Integrated attenuator for operation in high-field environments


• RF detector with threshold circuit for overload indication


• Individually calibrated with supplied calibration certificate

Typical Applications

• EMI compliance testing and measurement


• Magnetic field strength assessment per CISPR, MIL, FCC, ANSI, and ETSI standards


• Low-level field detection and characterization

Compatibility & Integration

• R&S IN600 bias unit for coaxial cable power supply


• R&S HFH2-Z8 tripod for two-axis antenna positioning


• R&S HFH2-Z9 3D adapter for X, Y, and Z plane measurements


• R&S HFH2-Z11 height adaptation set (from ~90 cm working height)


• Feeder cables HZ-3 and HZ-4; coaxial cables HZ-5 (3 m) and HZ-6 (10 m)