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- Joseph Helszajn, Michael A. McKay, Martyn Evan Caplin
- IEEE Circuits and Devices Magazine
- 2002

- W. D'Orazio, Ke Wu, Joseph Helszajn
- IEEE Microwave and Wireless Components Letters
- 2004

A substrate integrated waveguide (SIW) circulator is proposed and demonstrated in this work that can facilitate the integration of planar active components with high-Q passive components. Veryâ€¦ (More)

- Michael A. McKay, Joseph Helszajn
- IEEE Microwave and Guided Wave Letters
- 1999

An essential feature of any waveguide is its three classic definitions of impedance. The purpose of this paper is to provide some calculations on the voltage-current definition of impedance in singleâ€¦ (More)

- Joseph Helszajn, John Sharp
- IEEE Transactions on Microwave Theory andâ€¦
- 2005

One means of adjusting the first circulation condition of any waveguide circulator is to have recourse to a finite-element (FE) solver. The purpose of this paper is to do so for each of the threeâ€¦ (More)

- Joseph Helszajn
- IEEE Transactions on Microwave Theory andâ€¦
- 2006

The reflection angle of the in-phase eigenvalue and that of the reflection coefficient at port 1 of a terminated circulator are equal at a unique frequency at which the gyrotropy produces a returnâ€¦ (More)

- Joseph Helszajn
- IEEE Transactions on Microwave Theory andâ€¦
- 2012

The adjustment of the first circulation condition of the waveguide turnstile junction is an eigenvalue problem. It fixes all the physical parameters of the circulator, except for the gyrotropy. Thisâ€¦ (More)

- Joseph Helszajn, Marco Caplin, Joseph Frenna, Bill Tsounis
- IEEE Microwave and Wireless Components Letters
- 2014

A unique set of reference planes which enters into the descriptions of either a E-plane or an H-plane tee junctions are the locations of its two characteristics planes. One typical plane coincidesâ€¦ (More)

- Joseph Helszajn, Louis-Philippe Carignan
- IEEE Transactions on Microwave Theory andâ€¦
- 2015

One of the two independent variables entering into the description of the one-port complex gyrator circuit of a junction circulator is its quality factor. The other is the susceptance slopeâ€¦ (More)

- Joseph Helszajn, Michael A. McKay
- IEEE Microwave and Wireless Components Letters
- 2006

The conventional operation of the three-port circulator relies on a pair of split, counter-rotating, impedance poles and one in-phase impedance zero. It is, however, also possible to realizeâ€¦ (More)

- Joseph Helszajn
- IEEE Microwave and Wireless Components Letters
- 2005

The shape demagnetizing factors of a planar magnetic insulator are of some interest in the design of a number of microwave ferrite components. One means of experimentally evaluating these quantities,â€¦ (More)