Kenneth M Barnett

US Patent:

54832462, Jan 9, 1996

Filed:

Oct 3, 1994

Appl. No.:

8/317057

Inventors:

Kenneth C. Barnett - Delray Beach FL
Lorenzo A. Ponce De Leon - Lake Worth FL
Charles R. McMurray - Boynton Beach FL
Nadim M. Halabi - Sunrise FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01Q 136

US Classification:

343700MS

Abstract:

An omnidirectional antenna (100) includes a resonator (102) and a ground plane (104). The resonator (102) includes a dielectric substrate (402) having a top conductive plate (404) and a bottom conductive plate (406), wherein the top conductive plate (404) is shorted to the bottom conductive plate (406) proximal to a first end (436) and open at a second end (438) of the dielectric substrate (402), a resonator feed (416) having a location between the first (436) and second (438) ends, a first resonator ground (424) and a second resonator ground (408) coupled between the bottom conductive plate (406) and the ground plane (104), the first resonator ground (424) being contiguous to the bottom conductive plate (406) and having a location which is distal to the first end (436) for suppressing undesirable resonator resonance, and the second resonator ground (408) being contiguous to the bottom conductive plate (406) and having a location which is proximal to the first end (436) for controlling a radiation pattern of the resonator (102) to produce a substantially omnidirectional antenna beam pattern.

US Patent:

58942467, Apr 13, 1999

Filed:

Sep 29, 1997

Appl. No.:

8/939224

Inventors:

Kenneth Charles Barnett - West Palm Beach FL
Harold Michael Cook - Boynton Beach FL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H03L 7085

US Classification:

331 10

Abstract:

A VCO (Voltage Controlled Oscillator) (10) operates in a phase-locked loop at a desired frequency. One input to the VCO is a variable control signal (24) that holds the VCO at the desired frequency. Another input is a bias input (40) that changes the operating point of a transistor (34) in the VCO and also tends to change the VCO's frequency. The value of the variable control signal (24) is sensed while the bias input (40) is changed until a desired, minimum value of the control signal is sensed. The value of the bias input at that point is held constant while operating the VCO at the desired frequency and with minimal side band noise.