The Keysight N9355G is an RF power limiter engineered to protect sensitive instruments and components from excess RF power, DC transients, and electrostatic discharge. Operating across 10 MHz to 54 GHz with 50 Ω impedance, this bidirectional device incorporates integrated DC blocking on both input and output ports, making it suitable for network analyzers, spectrum analyzers, and amplifier applications. The N9355G triggers protection at a 23 dBm threshold, limiting continuous RF input to 1 W maximum while withstanding DC voltages up to 30 V. Its compact form factor—48.68 mm length × 16 mm width × 9 mm height—integrates into test configurations without introducing significant measurement uncertainty.
Technical Specifications
• Frequency Range: 10 MHz to 54 GHz
• Impedance: 50 Ω
• Power Limiting Threshold: 23 dBm
• Continuous RF Input Power (Maximum): 1 W
• Maximum DC Voltage: 30 V
• Insertion Loss (Maximum): Up to 6 dB
• Return Loss: Exceptional return loss for improved calibration accuracy
• DC Block: Integrated, blocking signals below 10 MHz; passing signals to 54 GHz
• Connector Type: 1.85 mm (male and female)
• Operating Temperature Range: 0 °C to +55 °C
• Storage Temperature Range: −40 °C to +70 °C
– Key Features
• Bidirectional architecture—input and output ports are interchangeable, eliminating orientation constraints
• Fail-safe design: triggers open circuit or short circuit to ground at high power levels
• Integrated DC blocking on both ports preserves signal integrity above 10 MHz
• Low insertion loss maximizes dynamic range in cascaded measurements
– Typical Applications
• Network analyzer input protection
• Spectrum analyzer safeguarding
• Amplifier input stage protection
• RF component testing in telecommunications, aerospace, and defense environments
– Compatibility & Integration
The N9355G connects via standard 1.85 mm connectors and operates within standard environmental specifications suitable for laboratory and field deployments. Part of the N935x series, it targets high-volume manufacturers and R&D operations requiring consistent protection without compromising measurement accuracy.
