Joseph Helszajn

1934 – 11 October 2019

Professor Joseph Helszajn was born in Belgium in 1934 and recently passed away. He moved to England in 1946. During his career he worked for significant amounts of time in the United Kingdom, United States and Canada. His formal education was spread over several institutions and he received his Doctor of Engineering from Leeds University in 1995. He was an esteemed international authority on non-reciprocal microwave circuits and devices. He made extremely valuable contributions to the field of ferro-electric components and to the design of such. Examples of his work are high power circ

• Synthesis of lumped element, distributed and planar filters
• Green's function, finite elements, and microwave planar circuits
• Microwave planar passive circuits and filters
• Waveguide junction circulators
• YIG resonators and filters
• Nonreciprocal microwave junctions and circulators
• Passive and active microwave circuits
• Principles of microwave ferrite engineering
• Ridge Waveguides and Passive Microwave Filters (Iee Electromagnetic Waves Series, 49)
• The stripline circulator
• Ferrite phase shifters and control devices
• Microwave engineering