best millimeter wave circulators

We have developed a new wideband hybrid circulator technology. The hybrid circulator has significantly higher bandwidth than the Y-junction. The hybrid circulator is an enabling technology for broadband transmit/receive applications.

Our Y-junction millimeter wave circulators are the most advanced on the market today. We use sophisticated impedance matching and mode controlling techniques to provide the widest bandwidth in the industry.


Model Flange (EIA) Band (GHz) Insertion Loss (dB, typ) Isolation (dB, typ)
HC148 WR-15 54 – 68 0.7 24
HC122 WR-12 70 – 86 0.6 24
HC100 WR-10 85 – 104 0.7 23
HC80 WR-8 107 – 133 1.0 25
HC65 WR-6.5 118 – 150 1.9 (preliminary) 21 (preliminary)
HC51 WR-5.1 150 – 190 2.2 21
HC34 WR-3.4 273 – 333 2.4 (preliminary) 21 (preliminary)


Model Flange (EIA) Band (GHz) Insertion Loss (dB, max) Isolation (dB, min)
YC148-61 WR-15 58 – 64 0.4 20
YC148-68 WR-15 65 – 71 0.5 20 (simulation)
YC122-73 WR-12 71 – 76 0.5 20
YC122-78 WR-12 75 – 81 0.5 20 (simulation)
YC122-83 WR-12 81 – 86 0.6 20
YC100-93 WR-10 90 – 95 0.7 20
YC100-95 WR-10 92 – 98 0.7 20 (simulation)
YC100-97 WR-10 94 – 100 0.7 20 (simulation)
YC80-110 WR-8 107 – 113 1.1 20 (simulation)
YC80-118 WR-8 115 – 120 1.1 20
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Millimeter Wave Hybrid Circulator Development

Using sophisticated impedance matching techniques, we squeeze about all the bandwidth possible out of our Y-junction millimeter wave circulators. Any further significant increases in bandwidth are prohibited by limitations in the ferrite material. We were not satisfied with the bandwidth limitations, so we found another way to implement the circulator function. 

Our new hybrid circulator is not a Y-junction. It is a passive device similar in size to the Y-junction but having an order of magnitude greater bandwidth. Our first hybrid circulator prototype covers the entire band from 150-190 GHz with more than 20 dB isolation and less than 2.2 dB insertion loss. This is not simulation data but actual test data. In theory, the hybrid circulator can be designed to cover full rectangular waveguide bands (eg. 140-220 GHz). The hybrid circulator is thus an enabling technology for high frequency, broadband transmit/receive systems. There is a patent pending. 

Our initial offerings are targeted to bands where there is widespread interest in the millimeter wave and microwave community. Over time we will continue to add products tuned to other sub-bands within the 54-333 GHz window in response to customer requests. Please don’t hesitate to contact us to discuss how we can apply our capabilities to your requirements. We don’t make just millimeter wave circulators, you can also find our industry leading millimeter wave isolators, as well as millimeter wave attenuators. We typically do not charge a design fee (NRE) to develop a circulator tuned to a specific sub-band. Our primary concern is to identify bands of  interest and provide components to serve the broader community.

Y-junction Millimeter Wave Circulator Development

We currently offer Y-junction millimeter wave circulators in the WR-15, WR-12, WR-10 and WR-8 bands (50-140 GHz). These millimeter wave circulator components are listed in the table above. We don’t use any complicated dielectric matching elements. Rather, all of our impedance matching circuitry is implemented through precision CNC machined features in the waveguide block which are highly repeatable and tightly controlled. The machined structures also make it easy to align the ferrite cores with some precision and obtain a high degree of uniformity between the three circulator ports.