QJC Series Precision Crossguide Couplers

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QJC Series Precision Crossguide Couplers
(PDF available)

Characteristics

Compact Size

Low Insertion Loss

Excellent Coupling Accuracy and Good Directivity

Product Description

QuinStar Technology's QJC series of compact precision crossguide directional couplers cover the frequency range of 18 to 170 GHz in nine waveguide bands. Three- and four-port configurations are available for standard models with midband nominal coupling values of 20, 30 and 40 dB. Other coupling values are available as custom products. 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. QuinStar can provide custom configurations and application-specific interfaces to suit unique needs.

Specifications

FREQUENCY BAND	K	Ka	Q	U	V	E	W	F	D
Frequency Range (GHz)	18-26.5	26.5-40	33-50	40-60	50-75	60-90	75-110	90-140	110-170
Waveguide Size	WR-42	WR-28	WR-22	WR-19	WR-15	WR-12	WR-10	WR-8	WR-6
Coupling Values (dB at center frequency)	Standard (20, 30 and 40 ± 1); Custom (17 to 40)
Bandwidth (min)	20% of waveguide band
Insertion Loss (dB max) ¹	0.4	0.4	0.5	0.6	0.6	0.8	1.0	1.2	1.3
Directivity (dB typ) ²	20	20	20	20	20	20	20	15	15
Main Line VSWR (max)	1.15:1	1.15:1	1.15:1	1.15:1	1.2:1	1.2:1	1.2:1	1.2:1	1.25:1
Secondary Line VSWR (max)	1.2:1	1.2:1	1.2:1	1.2:1	1.25:1	1.25:1	1.25:1	1.25:1	1.25:1
Coupling Flatness (± dB typ)	1.5	1.5	1.5	1.5	1.8	1.8	1.8	2.0	2.0

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

WR-42 and WR-28

WR-22 through WR-6

FREQUENCY BAND	WAVEGUIDE SIZE	FLANGE PATTERN	OUTLINE DIMENSIONS, inches/mm
FREQUENCY BAND	WAVEGUIDE SIZE	FLANGE PATTERN	A	B, C
K	WR-42	UG-595/U	1.25/31.8	1.25/31.8
Ka	WR-28	UG-599/U	0.90/22.9	1.00/25.4
Q	WR-22	UG-383/U	1.38/35.1	1.38/35.1
U	WR-19	UG-383/U	1.38/35.1	1.38/35.1
V	WR-15	UG-385/U	0.84/21.3	1.00/25.4
E	WR-12	UG-387/U	0.84/21.3	1.00/25.4
W	WR-10	UG-387/U	0.84/21.3	1.00/25.4
F	WR-8	UG-387/U	0.84/21.3	1.00/25.4
D	WR-6	UG-387/U	0.84/21.3	1.00/25.4

Ordering Information

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

Center frequency rounded to nearest GHz

(1A = 100-109 GHz, 1B = 110-119 GHz, etc.)

Coupling value in dB

(20, 30, 40 for standard products)

Number of ports:

	3	=	3 ports
	4	=	4 ports

Waveguide band designator:

K	=	K-band
A	=	Ka-band
Q	=	Q-band
U	=	U-band
V	=	V-band
E	=	E-band
W	=	W-band
F	=	F-band
D	=	D-band

Also available:
	Precision General Purpose Couplers (QJG Series)	Matched Hybrid Tees (QJH Series)
	Precision High Directivity Couplers (QJR Series)	E and H Plane Waveguide Tees (QUH Series)
	Bidirectional and Dual-directional Waveguide Couplers (QBC Series)	Short Slot Hybrid Power Divider (QSP Series)
	Broadband Waveguide Directional Couplers (QDC Series)	Single and Triple Ring Hybrid Power Divider (QHR Series)
	General Purpose Crossguide Couplers (QJX Series)	Multi-Output Power Divider (QMD Series)
-	Precision Bi-directional and Dual-directional Waveguide Couplers (QJB/QJD Series)
	Master List of All Products	Catalog Request