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Magic Tee Hybrid Couplers - CMT

Features:

  • Excellent port-to-port balance
  • Low insertion loss
  • Compact port arrangement
  • Excellent matching/high isolation

Applications:

  • General purpose power-splitters
  • Power combining
  • Phase-Frequency discriminators

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Download the CMT specsheet (.pdf)

Description

Millitech series CMT magic tee hybrid couplers are matched power dividers for a variety of applications ranging from power combining to general purpose power splitting. These couplers are four-port transmission line components with a port configuration as shown in Figure 1. A signal input to either the series arm (E-plane) or shunt arm (H-plane) will undergo equal power division into the two collinear ports. Power transmitted into the series arm (E-plane) will split so that the signals in each of the collinear transmission lines will be 180° out of phase. Power transmitted into the shunt arm (H-plane) will split so that the signals at each of the collinear transmission lines will be in-plane.

The couplers are available in two types: (1) covering 60% bandwidth in the specified band, (2) covering 90% of the waveguide bandwidth.

60% bandwidth magic tee hybrid couplers are available between 18 and 170 GHz. 90% bandwidth magic tee hybrid couplers are available between 18 and 110 GHz. They are extremely useful in applications where balanced power division and high isolation are required over a broad bandwidth. Typically these would include millimeter-wave bridge circuits for impedance and phase measurement, power dividers/combiners for balanced mixers, and phase/frequency discriminators.

Millitech also offers series CSS short slot hybrid couplers (90° phase difference between outputs) and a range of directional and crossguide couplers.

FIgure 1. Port Configuration

CMT - Port Configuration

Electrical Specifications

Model Number CMT-42 CMT-28 CMT-22 CMT-19 CMT-15 CMT-12 CMT-10 CMT-08 CMT-06
Frequency Band K Ka Q U V E W F D
60% and 90% Bandwidth Versions*1
Frequency Coverage
90% Bandwidth Version (GHz)
18-25 26.5-38 33-48 40-58 50-72 60-87 75-106 --- ---
Bandwidth
60% Bandwidth Version (GHz Center)
5 8 10 12 15 18 21 30 36
Selectable Center Frequency Range
60% Bandwidth Version (GHz)
20.5-22.5 30.5-34 38-43 46-52 57.5-64.5 69-78 85.5-95.5 105-120 128-146
Insertion Loss (dB) (max) 0.5 0.5 0.7 0.8 1.0 1.0 1.0 1.2 1.2
VSWR (max) H-Arm Ports 1.5:1 1.5:1 1.5:1 1.5:1 1.5:1 1.5:1 1.5:1 1.5:1 1.5:1
E-Arm Ports 1.6:1 1.6:1 1.6:1 1.6:1 1.6:1 1.6:1 1.6:1 1.6:1 1.6:1
Isolation (min) E- to H-Arms 30 30 30 30 30 30 30 30 30
Colinear Arms 20 20 20 20 20 20 20 20 20
Balance ±dB (max) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5

*1 – Percentage bandwidth denotes percent of full waveguide bandwidth.

Outline Drawings

CMT - Outline Drawing

Mechanical Specifications

Model Number CMT-42 CMT-28 CMT-22 CMT-19 CMT-15 CMT-12 CMT-10 CMT-08 CMT-06
A (in/mm) 1.5/38.10 1.5/38.10 1.5/38.10 1.5/38.10 1.2/30.48 1.2/30.48 1.2/30.48 1.2/30.48 1.2/30.48
B (in/mm) 1.5/38.10 1.5/38.10 1.5/38.10 1.5/38.10 1.2/30.48 1.2/30.48 1.2/30.48 1.2/30.48 1.2/30.48
C (in/mm) 1.5/38.10 1.5/38.10 1.5/38.10 1.5/38.10 1.2/30.48 1.2/30.48 1.2/30.48 1.2/30.48 1.2/30.48
Material Aluminum Aluminum Aluminum Aluminum Brass Brass Brass --- ---
Finish Chromate Chromate Chromate Chromate Gold Plate Gold Plate Gold Plate --- ---
Flange MIL.F-3922 /54-001* /54-003* /67B-006 /67B-007 /67B-009 /67B-009 /67B-010 /67M-M08 /67B-M06

*With #4-40 threaded holes.

How to Order

Specify Model Number
CMT-XX-ABB00
XX =Waveguide Band
  • WR – number
A= Flange Type
  • R – round (WR-22 through WR-06 only)
  • S – square (WR-42 and WR-28 only)
B= Bandwidth
  • 60 – 60% (Please specify center frequency for 60% version only)
  • 90 - 90%
  • CB - custom bandwidth (Please specify the center frequency. Bandwidth cannot exceed 90%)
0= Other Options
  • N – nonstandard (please specify requirements)

Example:

To Order: A WR-28, magic tee hybrid coupler with a bandwidth of 90%.

Specify: CMT-28-S9000