Cornelis F Dutoit

20020014932, Feb 7, 2002

May 2, 2001

09/847254

Vitaly Osadchy - Leningradskaia obl., RU
Cornelis DuToit - Ellicott City MD, US
Louise Sengupta - Ellicott City MD, US
Andrey Kozyrev - St. Petersburg, RU

H01P001/18

333/161000, 333/156000

A phase shifter includes a substrate, a first electrode positioned on a surface of the substrate, a tunable dielectric layer positioned on a surface of the electrode, a microstrip positioned on a surface of the tunable dielectric layer opposite the substrate, an input for coupling a radio frequency signal to the microstrip, an output for receiving the radio frequency signal from the microstrip, and a connection for applying a control voltage to the electrode. In an alternative embodiment, a second electrode can be positioned on the surface of the substrate and separated from the first electrode to form a gap positioned under the microstrip.

20060006961, Jan 12, 2006

Jun 17, 2005

11/155251

L. Sengupta - Ellicott City MD, US
Cornelis DuToit - Ellicott City MD, US
A.B. Kozyrev - St. Peterburg, RU
V.N. Osadehy - Leningzadskaia obl., RU

H01P 1/18

333161000

An embodiment of the present invention provides an apparatus, comprising a multi-tiered cascaded tunable dielectric phase shifter capable of operating in digital-analog regime by at least one cascade operable in an analog regime and at least one cascade operable in a digital regime. The multi-tiered cascaded tunable dielectric phase shifter may be a three tiered cascaded digital-analog phase shifter using broadside coupled lines with resonance terminations containing tunable dielectric film capacitors. The first two cascades of the three tiered cascades may be operable in a digital regime, and the third cascade may be operable in an analog regime and further the digital regime may operate at (0/180 and 0/90) and the analog regime may operate between (0÷90), wherein the analog cascade may provide phase states from 0 up to φN−1 and may add the continuous phase shift functionality to the digital cascades of the phase shifter. Also, the tunable dielectric phase shifter may be capable of providing a continuous 360 phase shift with 5% bandwidth and insertion loss of approximately 3 dB without modulation. An embodiment of the present invention provides that a phase shift by the tunable dielectric phase shifter may be enabled by one or more voltage tunable dielectric capacitors which comprises a low loss tunable dielectric material and metallic electrodes with predetermined shape, size, and distance.

20190097309, Mar 28, 2019

Sep 25, 2017

15/714252

- Washington DC, US
Cornelis F. DuToit - Ellicott City MD, US

H01Q 1/28
H01Q 15/16
H01Q 13/02
H01P 1/17
H01Q 3/02

An antenna system includes a reflector, an offset feed horn and a support platform. The reflector has a reflector surface. The reflector and offset feed horn are attached to the support platform. The offset feed horn transmits RF microwave energy toward the reflector surface. The antenna system further includes a turntable which has a single rotation axis. The turntable rotates about the antenna rotation axis. The support platform is attached to the turntable such that the turntable rotates the support platform. The reflector surface has a perturbed paraboloid geometrical shape that reflects most RF microwave energy along a beam peak pointing direction. The reflector surface reflects RF microwave energy towards the earth's surface in such a manner that the reflected RF microwave energy illuminates a narrow strip of the earth's surface from nadir to a point near the earth's horizon with substantially constant intensity. The offset feed horn is oriented and positioned such that it points away from the beam peak pointing direction.