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AS9100 Rev C, ISO 9001:2008,
ISO 14001:2004 and OHSAS 18001:2007

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Crossguide Couplers - CGC

Features:

  • Low insertion loss
  • High directivity
  • High and low band
  • Compact design

Applications:

  • Built-in test equipment
  • Power sampling
  • Phase-lock loops
  • Subsystems

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Download the CGC specsheet (.pdf)

Description

Millitech series CGC compact crossguide directional couplers are offered in the frequency range of 18 to 170 GHz. The nominal coupling value is 20 dB. Directivity ranges from 17 dB at the lower end of the band to 12 dB at the high end for all three-port units below 110 GHz. For complete coverage of each waveguide, each model (low, mid or high) provides nominal performance over the whole band, but meets the full specifications only over the specific portion of the waveguide band. These couplers are offered with the fourth port either internally terminated or unterminated (accessible).

These couplers feature low insertion loss, less than 0.5 dB in WR-28, 1.0 dB in WR-10, and 1.7 dB in WR-06. The coupling level is fairly constant over the applicable frequency range with a nominal flatness of ± 1.5 dB.

The coupling characteristics can be tailored to meet your requirements on special orders over narrow bandwidth. Other coupling values greater than 20 dB are available upon request.

Series CGC directional couplers are useful for sampling power from sources for phase or frequency locking and for built-in test applications. Their mechanical configuration allows them to be directly attached to other components with blind holes, without requiring additional waveguide sections. Their small size and high performance make them ideal for use in integrated assemblies where space is at a premium.

Millitech also offers series CL3 and CL4 high directivity directional couplers and series CMT and CSS power hybrids and dividers for applications where crossguide couplers are not suitable.

Electrical Specifications

Model Number CGC-42 CGC-28 CGC-22 CGC-19 CGC-15 CGC-12 CGC-10 CGC-08 CGC-06
Frequency band and range (GHz) K
18-26.5
Ka
26.5-40
Q
33-50
U
40-60
V
50-75
E
60-90
W
75-110
F
90-140
D
110-170
Bandwidth (GHz)*1 Lowband 18-22 26.5-31 33-40 40-48 50-60 60-72 75-89 90-110 110-134
Midband 20-24 29-35 38-45 46-54 57-67 69-81 85-99 105-125 128-152
Highband 23-26.5 34-40 43-50 52-60 65-75 78-90 96-110 120-140 146-170
Coupling value (dB) (typ) *2 20 20 20 20 20 20 20 20 20
Coupling flatness (±dB) (max) *3) 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Insertion loss (dB) (max) *4 0.5 0.5 0.5 0.6 0.6 1.0 1.0 1.5 1.7
Directivity (dB) (min) *5 *6 Lowband 17 17 17 17 17 17 17 12 12
Midband 15 15 15 15 15 15 15 12 12
Highband 12 12 12 12 12 12 12 12 12
Main line VSWR (max) 1.15:1 1.15:1 1.15:1 1.15:1 1.15:1 1.2:1 1.2:1 1.2:1 1.5:1
Secondary line VSWR (max) 1.2:1 1.2:1 1.2:1 1.2:1 1.2:1 1.25:1 1.25:1 1.25:1 1.5:1

*1 – See series CL3/CL4 for fullband performance and greater directivity.
*2 – Coupling value = -10 log10 (P3/P1). Nominal ±2 dB
*3 – 3-port version only. Coupling flatness for 4-port version is ±2.5 dB from K- to D-band.
*4 – Insertion loss = -10 log10 [(P2+P3)/P1].
*5 – 3-port version only. Directivity for 4-port version is 12 dB from K- to W-band and 7 dB for F- to D-band.
*6 – Directivity = 10 log10 (P3/P1).

CGC - Electric Specifications Diagrams

Outline Drawings

CGC - Outline Drawings

*The outlines shown may not reflect the latest information. Please contact Millitech for current outline drawings

Mechanical Specifications

Model Number CGC-42 CGC-28 CGC-22 CGC-19 CGC-15 CGC-12 CGC-10 CGC-08 CGC-06
A (in/mm) 1.20/30.5 1.00/25.4 1.30/33.0 1.30/33.0 1.00/25.4 1.00/25.4 1.00/25.4 1.00/25.4 1.00/25.4
B (in/mm) 1.06/26.9 0.9/22.9 1.24/31.5 1.22/31.0 0.83/21.1 0.82/20.7 0.82/20.5 1.03/26.1 1.03/26.1
C (in/mm) 0.44/11.1 0.37/9.5 0.56/14.3 0.56/14.3 0.38/9.5 0.38/9.5 0.38/9.5 0.49/12.5 0.50/12.7
D (in/mm) 0.62/15.7 0.52/13.2 0.68/17.3 0.66/16.8 0.45/11.5 0.44/11.2 0.43/10.9 0.53/13.46 0.53/13.5
Flange MIL.F-3922 /54.001* /54-003* /67B-006 /67B-007 /67B-008 /67B-009 /67B-010 /67B-M08 /67B-M06

*With #4-40 threaded holes.

How to Order

Specify Model Number
CGC-XX-ABC00Y
XX =Waveguide Band
  • WR – number
A= Flange Type
  • R – round (WR-28 through WR-06 only)
  • S – square (WR-42 and WR-28 only
B= Bandwidth (frequency coverage)
  • L – lowband (lower 40% of waveguide band)
  • M – midband (middle 40% of waveguide band)
  • H – highband (upper 40% of waveguide band)
C= Configuration
  • 3 – 3 ports (fourth port terminated internally)
  • 4 – 4 ports
0= Other Options
  • N – nonstandard (please specify requirements)