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QJX Series General Purpose Crossguide Couplers
(PDF available)

 

Characteristics
  • Compact Size
  • Low Insertion Loss
  • Low Cost / Moderate Performance
Product Description

QuinStar Technology's QJX series of compact general purpose 3-port crossguide directional couplers cover the frequency range of 18 to 60 GHz in four waveguide bands with midband nominal coupling values of 20 and 30 dB. These crossguide couplers are ideal devices for sampling or inserting RF energy in a waveguide transmission line without affecting the transmitting signal.

Typical applications include frequency monitoring, power sampling and built-in testing. The crossguide type of directional coupler has the advantage of lower insertion loss, smaller size and lower cost when compared to broadwall directional couplers.

Specifications
FREQUENCY BAND K Ka Q U
Frequency Range (GHz) 18-26.5 26.5-40 33-50 40-60
Waveguide Size WR-42 WR-28 WR-22 WR-19
Coupling Values
(dB
at center frequency)
20 and 30 ± 2 dB
Bandwidth (min) 20% of waveguide band
Insertion Loss (dB max) 1 0.5 0.5 0.6 0.7
Directivity (dB typ) 2 15
Main Line VSWR (max) 1.15:1
Secondary Line VSWR (max) 1.2:1
Coupling Flatness (dB max) ±1.5

1 Insertion loss is defined as the power loss in excess of the loss due to coupling.
2 Directivity is the difference between power levels at the coupled port when input and output ports are interchanged.


Outline Drawings / Mechanical Specifications
FREQUENCY
BAND
WAVEGUIDE
SIZE
FLANGE
PATTERN
OUTLINE DIMENSIONS, inches/mm
A/C B D
K WR-42 UG-595/U 2.00/50.8 1.00/25.4 0.19/4.7
Ka WR-28 UG-599/U 1.50/38.1 0.75/19.1 0.16/4.1
Q WR-22 UG-383/U 1.50/38.1 0.75/19.1 0.13/3.2
U WR-19 UG-383/U 1.50/38.1 0.75/19.1 0.11/2.8

Ordering Information

Model Number: QJX - AB CD E 0 (Please specify exact center frequency when ordering)

AB = Center frequency rounded to nearest GHz
CD = Coupling value in dB
(20 or 30)
E = Waveguide band designator:
K = K-band
A = Ka-band
Q = Q-band
U = U-band

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