Erick N Maxwell

US Patent:

8134394, Mar 13, 2012

Filed:

Mar 18, 2009

Appl. No.:

12/406681

Inventors:

Erick Maxwell - Temple Terrace FL, US
Thomas Weller - Tampa FL, US
Ebenezer Odu - Tampa FL, US

Assignee:

University of South Florida - Tampa FL

International Classification:

H03K 3/84

US Classification:

327164, 327291, 375130

Abstract:

A multi-port circuit and corresponding method for simultaneous shaping of sub-nanosecond pulses (MCSP). The MCSP includes a coupled-line coupler, a Schottky detector diode, and circuitry for compressing the rising and falling edges of a waveform. The MCSP simultaneously produces square wave, Gaussian, and monocycle waveforms by differentiating a sinusoidal source. The method includes the steps of compressing the rising edge of a sinusoidal source waveform, differentiating the resulting waveform to form a square waveform and a Gaussian waveform, filtering out the positive going Gaussian to produce a negative going Gaussian, differentiating the Gaussian waveform to form a monocycle waveform, and compressing the falling edge of the square waveform to produce a square wave form with both edges compressed.

US Patent:

8248125, Aug 21, 2012

Filed:

Feb 9, 2012

Appl. No.:

13/369936

Inventors:

Erick Maxwell - Lithia Springs GA, US
Thomas Weller - Lutz FL, US
Ebenezer Odu - Brandon FL, US

Assignee:

University of South Florida - Tampa FL

International Classification:

H03K 3/84

US Classification:

327164, 327 18, 327 27, 327291

Abstract:

A multi-port circuit and corresponding method for simultaneous shaping of sub-nanosecond pulses (MCSP). The MCSP includes a coupled-line coupler, a Schottky detector diode, and circuitry for compressing the rising and falling edges of a waveform. The MCSP simultaneously produces square wave, Gaussian, and monocycle waveforms by differentiating a sinusoidal source. The method includes the steps of compressing the rising edge of a sinusoidal source waveform, differentiating the resulting waveform to form a square waveform and a Gaussian waveform, filtering out the positive going Gaussian to produce a negative going Gaussian, differentiating the Gaussian waveform to form a monocycle waveform, and compressing the falling edge of the square waveform to produce a square wave form with both edges compressed.

US Patent:

20070237208, Oct 11, 2007

Filed:

Dec 19, 2006

Appl. No.:

11/612713

Inventors:

Erick Maxwell - Temple Terrace FL, US
Thomas Weller - Lutz FL, US

Assignee:

UNIVERSITY OF SOUTH FLORIDA - Tampa FL

International Classification:

H04B 1/00

US Classification:

375130000

Abstract:

The present invention provides a single-stage tunable Ultra-Wideband (UWB) pulse generator, by creating and differentiating a variable edge rate signal. Edge rate variability is introduced by first applying a step recovery diode (SRD) to compress the edges of the source and then applying a simple RC network to adjust the edge rate. Next, the resulting signal is differentiated using microstrip transmission lines. The tunable generator resulting from this approach demonstrates a Gaussian and monocycle pulses with good symmetry and low distortion over the tunable range.

US Patent:

20120280870, Nov 8, 2012

Filed:

May 7, 2012

Appl. No.:

13/466001

Inventors:

Erick N. Maxwell - Atlanta GA, US

Assignee:

Georgia Tech Research Corporation - Atlanta GA

International Classification:

H01Q 1/38

US Classification:

343745

Abstract:

An exemplary embodiment of the present invention provides a tunable liquid core patch antenna comprising a top-side patch, a ground plane, and a liquid core substrate positioned substantially between the top-side patch and the ground plane. The liquid core substrate can comprise a first liquid having a first dielectric constant and a second liquid having a second dielectric constant greater than the first dielectric constant. The first liquid and second liquid can form a mixture having an effective dielectric constant greater than the first dielectric constant and less than the second dielectric constant.