​​4 Port Devices


Four port devices can be realized​ by joining two 3 port devices via the appropriate ports. As system performance requirements become more demanding, new design approaches must be adopted. These include Faraday rotation devices and phase shift circulators. The bandwidth and isolation limitations of 3 port devices are overcome through a distributed architecture that enables more ferrite material to be incorporated into the transmission path, thereby achieving an increase in the biasing magnetic field. Phase shift circulators can be designed to handle higher RF power than 3-port devices.

4 Port Devices At a Glance

  • Wide bandwidth operation
  • High power handling capability
  • L Band to Ka Band Operation 
  • Designed to minimalize harmonics and third order intermodulation products
  • ITAR Free


Differential ​Phase Shift Circulator with
integrated heatsink asse​​mbly


Four port duplexor assembly
with dummy load


 Common Specifications

Operating Frequency Range
Insertion loss
Power handling
(kW Peak)
Return Loss
905 – 935 0.3 max. 200 23 min 23 min
3.1 - 3.3 0.4 max. 45 20 min  
5.4 – 5.9 0.4 max. 2 20 min 20 min
5.6 – 5.65 0.4 max. 250 20 min 20 min
9.2 – 9.3 0.3 max. 70 23 min 26.4 min
34.5 -35.5 0.6 max 4 23 min 23 min

If you haven’t found exactly what you are looking for click here to contact Teledyne Lincoln Microwave about a solution which meets your exact requirement.

 Additional Information

Teledyne Lincoln Microwave 4 port differential phase shift circulators are typically configured with Port 4 terminated by a load, in order to operate as a high power circulator. When configured with 2 loads the device can also be used as a high power isolator.

Close attention has to be given to the generation of harmonics and third order intermodulation products that occur when non-linear elements such as ferrite materials and mechanical imperfections are introduced into transmission lines. Ferrite selection and fabrication are critical, as is designing to minimize the requirement for supplementary tuning elements within the waveguide.

The final designs depend on other considerations, such as dissipated losses, power handling capacity and reproducibility. Teledyne Lincoln Microwave design devices which possess very low dissipative loss, are fit for production with minimal final tuning, and produce performance which is consistent from unit to unit.





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