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An RF/microwave 3-dB 90 degree coupler is also called a Quadrature (or Quad) Hybrid. It is extremely useful for eliminating reflections, combining amplifiers, for creating I/Q mixers, image reject mixers, and many other applications. Marki Quadrature Hybrids offer excellent phase and amplitude balance across a very broad bandwidth. Additionally the QH-0R71R3 offers a layout with parallel outputs.

Electrical Specifications
Parameter1 Frequency Range (GHz) Min Typ Max
Coupling (dB) 4-40   3  
Phase Shift (Degrees)   90  
Amplitude Balance (dB) 2   ±0.4 ±1.2
Phase Balance (Degrees)   ±5 ±12
Excess Through Line Insertion Loss (dB)3   2  
VSWR 4 to 30     1.65
  30 to 40   1.9  
Isolation (dB) 4 to 30 13 18  
  30 to 40 8 12  
Weight (g)     70  
1Specifications guaranteed when operated in a 50Ω system. 2Maximum amplitude differential is twice the magnitude of the amplitude balance (see Fig. 3). 3Excess Insertion Loss = (Input to Output Insertion Loss) – 3 dB.





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