Microwave and Millimetric Frequency Co-fired Dielectric and Ferrite Assemblies for 4G and 5G Circulator Devices with Dave Cruickshank

Artech House author David Cruickshank’s title, Implementing Full Duplexing for 5G, examines the current state of the art in developing full duplex (FD) systems in 5G LTE cellular communications.

He shared a fascinating invited plenary presentation on Microwave and Millimetric Frequency Co-fired Dielectric and Ferrite Assemblies for 4G and 5G Circulator Devices, click to see all 59 pages of the presentation:

Cruickshank MMA 2018 Presentation

He also participated in an interview with the Microwave Journal, linked here.

Read on for an in-depth look at Implementing Full Duplexing for 5G:

The book looks at the potential effect of full duplexing on the major platforms of cellular communication- base station, relay, access point and mobile phone, in terms of their constituent hardware. Full duplexing effectively doubles the spectral utilization of existing communication bands and is potentially one method of increasing capacity as 5G data demand rises in the future. The focus is on the RF hardware, that is the transceiver and antenna components, and how it can be adapted to solve the self-interference problem in full duplexing. This includes looking at methods of separating transmit and receive signals using separate antennas, dual polarization of single antennas, and duplexing circulators, but also discusses the relative merits and allocation of analog and digital self-interference mitigation techniques.

Relatively new methods of duplexing are discussed, including non-magnetic spatio-temporal modulation to replicate magnetic circulation, electrical balance duplexers, and a review of progress in magnetic circulators, where significant improvements in size, cost and ease of integration have occurred, using different transmission line approaches such as substrate integrated waveguide. The book will attempt to assign the best application of each method by both platform and frequency.

Author bio: David B. Cruickshank is a microwave materials applications consultant with more than 40 years of R&D experience, applications engineering, engineering management and general management at Ferranti Radar and Racal Electronics in the UK, and Skyworks Trans Tech in the US. He earned his degree in physical chemistry from the University of Edinburgh.


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