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Ferrite Circulators & Isolators - JFD

Features:

  • High isolation
  • Low insertion loss
  • Compact, lightweight

Applications:

  • Assemblies and subsystems
  • Amplifiers and oscillators
  • Duplexer in transceivers

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Download the JFD specsheet (.pdf)

Description

Millitech series JFD junction ferrite devices (circulators and isolators) cover the frequency range from 18 to 100 GHz. The circulator is a three-port, ferrite junction device which can be configured as an isolator by terminating one of the ports. The standard units are produced with an in-line tee configuration, which is suitable for compact circuit layout and efficient use of available space. The high isolation, low insertion loss and low VSWR (high return loss) typical of these ferrite devices make them ideal for use with frequency sources, amplifiers, and receivers.

The circulator is commonly used as a duplexer for combining, transmitting and receiving functions with adequate mutual isolation, and for injection-locked amplifiers. Port orientations for series JFD are straight in line or right angle. Triple junction units are also available.

Though narrower in bandwidth when compared to broadband (full waveguide band) Faraday-rotation isolators (series FBI) and wide band isolators (series WBI), the series JFD isolators are much smaller in size and lower in insertion loss. Millitech also offers series WBI wideband isolators that are similar in size and insertion loss.

Series JFD Partial Band Single/Triple-Junction Isolator (Option P)

Electrical Specifications

Model Number JFD-42 JFD-28 JFD-22 JFD-19 JFD-15 JFD-12 JFD-10
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
Single Junction Units (Partial band)
Bandwidth (GHz)*2 (max) 2.0 2.0 2.0 2.0 2.0 2.0 2.0
Isolation (dB) (min) 20 20 20 20 20 20 20
Insertion Loss (dB) (GHz) (max) 0.3 0.5 0.5 0.6 0.7 0.8 0.8
VSWR (max) 1.2:1 1.2:1 1.2:1 1.3:1 1.3:1 1.3:1 1.3:1
Power rating (Watts) (max)*1 10 10 8 7 6 5 5
Triple-Junction Circulators
Isolation (dB) (min, ports 1 to 2 & 3 to 2) --- 35 35 35 35 35 35
Insertion Loss (dB) (max, ports 1 to 2 & 2 to 3) --- 0.8 1.0 1.2 1.4 1.6 1.8
VSWR (max) --- 1.2:1 1.2:1 1.2:1 1.3:1 1.3:1 1.3:1
Bandwidth (GHz)*2 (max) --- 2.0 2.0 2.0 2.0 2.0 2.0*3
Power rating (Watts) (max)*1 --- 10 8 7 6 5 5
Triple-Junction Isolators
Isolation (dB) (min) --- 50 50 50 50 50 50
Insertion Loss (dB) (max) --- 1.2 1.3 1.6 1.9 2.2 2.5
VSWR (max) --- 1.2:1 1.2:1 1.2:1 1.3:1 1.3:1 1.3:1
Bandwidth (GHz)*2 (max) --- 2.0 2.0 2.0 2.0 2.0 2.0*3
Power rating (Watts) (max)*1 --- 10 8 7 6 5 5

*1 - Load VSWR 3:1 or better.
*2 - Maximum bandwidth offered for the standard products. Please specify bandwidth requirement.
*3 - GHz bandwidth for frequencies above 96 GHz.

Outline Drawings

JFD - Option P Outline Drawings

Mechanical Specifications

Model Number JFD-42 JFD-28 JFD-22 JFD-19 JFD-15 JFD-12 JFD-10
Finish Aluminum with clear chromate Brass with gold plating
Single Junction Isolators
A (in/mm) 1.20/30.48 1.10/27.94 1.19/30.23 1.19/30.23 1.00/25.40 1.00/25.40 1.00/25.40
B (in/mm)*1 1.44/36.58 1.14/28.96 1.39/35.31 1.39/35.31 1.04/26.42 1.04/26.42 1.04/26.42
C (in/mm) 0.97/24.64 0.84/21.34 1.28/32.51 1.28/32.51 0.99/25.15 0.99/25.15 0.99/25.15
D (in/mm)*1 0.94/23.88 0.73/18.54 0.78/19.81 0.78/19.81 0.50/12.70 0.50/12.70 0.50/12.70
E (in/mm) 0.48/12.19 0.42/10.67 0.62/15.75 0.62/15.75 0.45/11.43 0.46/11.68 0.47/11.94
Flange MIL.F-3922 /54.001* /54-003* /67B-006 /67B-007 /67B-008 /67B-009 /67B-010
Triple-Junction Isolators*2
A (in/mm) --- 1.50/38.10 1.50/38.10 1.50/38.10 1.10/27.94 1.10/27.94 1.10/27/94
B (in/mm) --- 1.25/31.75 1.25/31.75 1.25/31.75 1.14/28.96 1.14/28.96 1.14/28.96
C (in/mm) --- 1.21/30.75 1.21/30.75 1.21/30.75 0.98/24.89 0.98/24.89 0.98/24.89
D (in/mm) --- 0.60/15.24 0.60/15.24 0.60/15.24 0.58/14.73 0.58/14.73 0.58/14.73
E (in/mm) --- 0.60/15.24 0.60/15.24 0.60/15.24 0.49/12.45 0.49/12.45 0.49/12.45
Flange MIL.F-3922 --- /54-003* /67B-006 /67B-007 /67B-008 /67B-009 /67B-010

*With #4-40 threaded holes
*1 - Circulators only. Add .04 in (1.016mm) for isolators
*2 - Circulators only. Add 0.5 in (12.7 mm) load to "B" dimension for isolators

Port Configuration for Isolators/Circulators
(Not available on fullband units)

  Port Orientation Option R   Port Orientation Option S
Port Orientation Option R Port Orientation Option S

Series JFD Fullband Single-Junction Isolator (Option F)

Electrical Specifications

Model Number JFD-42 JFD-28
Frequency band and range(GHz) K
18-26.5
Ka
26.5-40
Bandwidth (GHz)*2 (max) 8.5 13.5
Isolation (dB) (min) 20 18
Insertion Loss (dB) (min) 0.4 0.6
VSWR (max) 1.3:1 1.4:1
Power rating (Watts) (max)*1 10 10

*1 - Load VSWR 3:1 or better.
*2 - Maximum bandwidth offered for the standard products. Please specify bandwidth requirement..

Outline Drawings

JFD - Option-F Outline Drawings

Mechanical Specifications

Fullband Units (Option F)
A (in/mm) 1.00825.4 0.90/22.9
B (in/mm) 1.15/29.2 0.90/22.9
C (in/mm) 1.00/25.4 1.00/25.4
D (in/mm) 0.88/22.4 0.90/22.9
E (in/mm) 0.44/11.18 0.38/9.65
Flange MIL.F-3922 /54.001* /54-003*

*With #4-40 threaded holes.

How to Order

Specify Model Number*
JFD-XX-ABCDE
XX = Output Waveguide
  • WR - number (triple junction units not available in WR-42)
A =Flange Type
  • R - round (WR-28 through WR-10 partial band units only)
  • S - square (WR-42 single junction and WR-28 only)
B = Unit Type
  • I - isolators (triple junction units not available in WR-42)
  • C - circulator (triple junction units not available in WR-42)
C = Configuration
  • 1 - single junction
  • 3 - triple junction (not available in WR-42)
D = Port Orientation (isolators only)
  • S - straight in-line ports (standard)
  • R - at right angle to one another (single junction only), please specify port orientation. Not available on fullband units.
  • N - not applicable to circulators
E = Bandwidth
  • P - partial band (WR-42 through WR-10)
  • F - fullband (WR-42 and WR-28 only)
  • N - nonstandard (please specify)
*Please specify center frequency and required bandwidth when ordering.