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Calibration and adjustments of degree-1 and -2 re-entrant turnstile circulators using a partially recessed quarter-wave long dielectric resonator. (2015)
Journal Article
Helszajn, J., Sharp, J., & Carignan, L. (2015). Calibration and adjustments of degree-1 and -2 re-entrant turnstile circulators using a partially recessed quarter-wave long dielectric resonator. IET microwaves, antennas & propagation, https://doi.org/10.1049/iet-map.2014.0358

The choice of reference planes in the design of the turnstile circulator is not unique. The purpose of this study is to examine two possibilities each of which is equally valid and experimentally verified. One possible arrangement is obtained by repl... Read More about Calibration and adjustments of degree-1 and -2 re-entrant turnstile circulators using a partially recessed quarter-wave long dielectric resonator..

An FE adjustment of a waveguide turnstile junction circulator using a three quarter wavelength gyromagnetic resonator. (2012)
Working Paper
Helszajn, J., & Sharp, J. (2012). An FE adjustment of a waveguide turnstile junction circulator using a three quarter wavelength gyromagnetic resonator

One difficulty with the design of millimetre waveguide junction circulators using quarter-wave long gyromagnetic resonators, beside that of fabrication, is the inability to realize the required gyrotropy using existing ferrite materials. This shortc... Read More about An FE adjustment of a waveguide turnstile junction circulator using a three quarter wavelength gyromagnetic resonator..

Split frequencies and susceptances of the three port junction circulator from an experimental determination of the complex gyrator circuit (2008)
Journal Article
Helszajn, J., Sharp, J., & Mackay, M. (2008). Split frequencies and susceptances of the three port junction circulator from an experimental determination of the complex gyrator circuit. IEEE Transactions on Microwave Theory and Techniques, 56, 2213-2220. https://doi.org/10.1109/TMTT.2008.2003136

The adjustment of the classic three port circulator involves an in-phase eigen-network and a pair of split counter-rotating ones. The purpose of this paper is to use some recent relationships to experimentally extract the split susceptances of the co... Read More about Split frequencies and susceptances of the three port junction circulator from an experimental determination of the complex gyrator circuit.

DS-CDMA PN code acquisition in Rayleigh Fading Channel. (2006)
Journal Article
Sharif, M., Obiebi, J., & Sharp, J. (2006). DS-CDMA PN code acquisition in Rayleigh Fading Channel. The Mediterranean journal of electronics and communications, 2, 59-71

In this paper, an adaptive double dwell PN code acquisition circuit suitable for use in DS-CDMA systems is proposed. The adaptive nature of the circuit is based on the cell averaging constant false alarm rate technique. It is analysed in a Rayleigh f... Read More about DS-CDMA PN code acquisition in Rayleigh Fading Channel..