ISO/IEC 17025 Accredited · Trusted by Engineers Worldwide · Serving 11 Industries
+1 530-268-1860 contact@microprecision.com
ISO/IEC 17025 Accredited · Trusted by Engineers Worldwide · Serving 11 Industries
+1 530-268-1860 contact@microprecision.com
RF directional couplers are passive microwave components that sample a small portion of signal power from a transmission line — used for power monitoring, VSWR measurement, and feed-forward amplifier design. Micro Precision stocks certified dual directional couplers from Keysight and Narda, covering 450 MHz through 18 GHz. All units are ISO/IEC 17025 calibrated and ship within 2 business days.
 | Brand Keysight Condition Used Frequency Range 2–18 GHz $595.00 |
 | Brand Keysight Condition Used Frequency Range 450–940 MHz $195.00 |
 | Brand Keysight Condition Used Frequency Range 1.9–4.0 GHz $195.00 |
 | Brand Keysight Condition Used Frequency Range 100 MHz – 2 GHz $495.00 |
 | Brand Narda Condition Used Frequency Range 500 MHz – 1 GHz $145.00 |
Buying Guide
Match the coupler to your frequency, coupling factor, and application requirements.
Select a directional coupler whose rated frequency range fully covers your operating band — with at least 10% headroom on each end. The Keysight 11692D (2–18 GHz) covers the widest band for microwave and defense applications. Narrowband coupler options (450–940 MHz) suit cellular and land mobile radio systems.
The coupling factor (in dB) determines how much signal is sampled from the main line. A 10 dB coupler passes 90% of power forward while sampling 10%. Higher directivity (typically >20 dB) ensures the coupled port accurately measures forward power without reverse signal contamination.
All 5 couplers in stock are dual directional — sampling both forward and reflected power simultaneously. This is essential for VSWR measurement, return loss monitoring, and power amplifier testing. Single directional couplers only sample one direction and are suited for simpler power monitoring applications.
FAQ
RF directional couplers are used for power monitoring, signal sampling, VSWR measurement, feed-forward amplifier design, and test signal injection. They allow engineers to measure or tap a transmission line signal without significantly interrupting the primary signal path. Common applications include radar, telecommunications, satellite systems, and RF lab testing.
A directional coupler samples power traveling in one direction only (forward). A bidirectional or dual directional coupler samples both forward and reverse power simultaneously through two separate coupled ports. All couplers currently in stock at Micro Precision are dual directional — suitable for complete VSWR and return loss measurement setups.
Coupling factor selection depends on your power levels and detector sensitivity. 10 dB coupling is most common for lab and production testing where adequate coupled signal is needed. 20 dB coupling is used when minimum insertion loss on the main line is critical. Always verify that the coupled output power is within the input range of your power meter or analyzer.
Yes. Every RF directional coupler from Micro Precision undergoes full ISO/IEC 17025 accredited calibration verification before shipping. All units include NIST-traceable calibration documentation. Our 30-day return policy covers all refurbished RF components.
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