Spectrum Control Inner/Outer DC Blocks provide DC isolation on both the center and outer conductors of a coaxial transmission line while allowing RF and microwave signals to pass with minimal loss. This provides more complete DC isolation between interconnected RF components.
Available in multiple frequency ranges, voltage ratings, and connector configurations, Inner/Outer DC Blocks support applications requiring isolation of both signal and ground paths. Their passive design makes them well suited for test, communications, aerospace, defense, and other RF and microwave systems.
Inner/Outer Performance & Selection
How it Works
An Inner/Outer DC Block uses capacitive isolation on both the center and outer conductors, blocking DC continuity through both paths while allowing RF and microwave signals to pass.
Understanding DC Block Performance
Inner/Outer DC Blocks provide DC isolation across both coaxial conductors while maintaining efficient RF and microwave transmission. Key specifications help determine the right model for an application:
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Operating Frequency: Choose a range that supports the required RF bandwidth.
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Signal Integrity: Low insertion loss and VSWR help preserve signal integrity.
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Voltage & Interface: Match voltage ratings and connectors to system requirements.
With both the center and outer conductors DC isolated, these blocks provide greater DC isolation between connected RF devices while allowing RF signals to pass.
Why it Matters
Isolating both conductors helps prevent unwanted DC currents and ground-loop effects between connected equipment. This provides greater electrical isolation while maintaining the RF signal path.
Part Number |
Freq. Range (GHz) |
Voltage |
VSWR Max. |
Insertion Loss (dB) |
Connector / Configuration |
| General Purpose | |||||
| 0.01 - 18 | 200 | 1.35:1 | 0.5 | SMA - F/F | |
| 0.01 - 18 | 200 | 1.35:1 | 0.5 | SMA - M/M | |
| 0.01 - 18 | 200 | 1.35:1 | 0.5 | SMA - M/F | |
| 0.01 - 18 | 200 | 1.35:1 | 0.6 | N-Type - M/M | |
| 0.01 - 18 | 200 | 1.35:1 | 0.6 | N-Type - F/F | |
| 0.01 - 18 | 200 | 1.35:1 | 0.6 | N-Type - M/F | |
| 0.01 - 40 | 200 | 1.45:1 | 0.75 | N-Type - M/F | |
| 0.01 - 26.5 | 200 | 1.35:1 | 0.75 | 2.9mm - M/F | |
| 0.1 - 50 | 75 | 1.75:1 | 1.5 | 2.4mm M/F | |
Inner/Outer DC Block - How it Works
Blocks DC on both the center and outer conductors while allowing RF signals to pass.
Typical Applications
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RF and microwave test setups
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Ground-isolated measurement systems
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Radar and sensing applications
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Electronic warfare equipment
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Satellite communication systems
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Aerospace and avionics systems
- RF subsystem interconnection
- Signal and ground-path isolation
Why Choose Spectrum Control?
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Inner, Outer, and Inner/Outer options
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Broad RF and microwave frequency coverage
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Multiple DC voltage options
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Wide selection of coaxial interfaces
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Low-loss, high-performance designs
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Compact passive 50-ohm solutions
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Flexible mechanical configurations
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Detailed performance specifications