One or more feedback elements generate a feedback signal in response to a transmitted signal outputted by each radiator of the antenna system. This feedback signal is received by each radiator, also described as a radiating element, and combined with any leakage signal present at the port of the antenna. Because the feedback signal and the leakage signal are set to the same frequency and are approximately 180 degrees out of phase, this signal summing operation serves to cancel both signals at the output port, thereby improving the port-to-port isolation characteristic of the antenna. Each feedback element can include a photo-etched planar metal strip supported by a planar dielectric card made from printed circuit board material. Such feedback elements can provide a high degree of repeatability and reliability in that the manufacturing of such feedback elements can be precisely controlled.
One or more feedback elements generate a feedback signal in response to a transmitted signal outputted by each radiator of the antenna system. This feedback signal is received by each radiator, also described as a radiating element, and combined with any leakage signal present at the port of the antenna. Because the feedback signal and the leakage signal are set to the same frequency and are approximately 180 degrees out of phase, this signal summing operation serves to cancel both signals at the output port, thereby improving the port-to-port isolation characteristic of the antenna. Each feedback element can include a photo-etched planar metal strip supported by a planar dielectric card made from printed circuit board material. Such feedback elements can provide a high degree of repeatability and reliability in that the manufacturing of such feedback elements can be precisely controlled.
Joseph R. Ippolito - Batavia IL Henry Villegas - Oak Forest IL John S. Wilson - Downers Grove IL
Assignee:
Andrew Corporation - Orland Park IL
International Classification:
H01Q 2126
US Classification:
343797
Abstract:
An improved antenna system for transmitting and receiving electromagnetic signals comprising a backplane having a length and a vertical axis along the length. A plurality of dipole radiating elements project outwardly from a surface of the backplane. Each of the elements includes a balanced orthogonal pair of dipoles aligned at first and second predetermined angles with respect to the vertical axis, forming crossed dipole pairs. An unbalanced feed network extends along the backplane and connected to the radiating elements. A printed circuit board balun is attached to each of the dipoles. The antenna can also include a parasitic element positioned along the vertical axis such that primary electromagnetic fields induce currents on the parasitic element, these induced currents re-radiate secondary electromagnetic fields which cancel portions of the primary electromagnetic fields, thereby improving isolation.
TIN DRUM ASIACAFE Atlanta, GA 2013 to 2014 Vice President of OperationsFIREHOUSE SUBS New York, NY 2011 to 2013 President / OwnerARBY'S RESTAURANT GROUP Indianapolis, IN 2008 to 2011 Vice President of OperationsARBY'S RESTAURANT GROUP Columbus, OH 2006 to 2008 Senior Director of OperationsARBY'S RESTAURANT GROUP Columbus, OH 2004 to 2006 Director of OperationsARBY'S RESTAURANT GROUP Cleveland, OH 2003 to 2004 Area SupervisorTIM HORTONS COFFEE AND DONUTS Buffalo, NY 1999 to 2003 Franchise Business ConsultantTIM HORTONS COFFEE AND DONUTS Buffalo, NY 1997 to 1999 District ManagerBOSTON MARKET Buffalo, NY 1995 to 1997 District ManagerBOSTON MARKET Buffalo, NY 1995 to 1995 General ManagerBOSTON MARKET Cleveland, OH 1993 to 1995 Assistant ManagerAPPLEBEE'S NEIGHBORHOOD GRILL AND BAR Buffalo, NY 1991 to 1993 Assistant Manager
Education:
FRANKLIN UNIVERSITY Columbus, OH 2006 to 2008 B.B.A. in Business AdministrationERIE COMMUNITY COLLEGE Buffalo, NY 1992 A.A.S. in Criminal JusticeNIAGARA COMMUNITY COLLEGE Sanborn, NY 1991 A.A.S. in Accounting
Oct 2009 to 2000 Regional Sales ManagerBUILDING STONE PRODUCTS Lemont, IL Apr 1999 to Oct 2009 Sales RepresentativeCOLUMBIA PIPE & SUPPLY Chicago, IL Mar 1985 to Mar 1999 Sales Representative
Education:
NORTHEAST MISSOURI STATE UNIVERSITY Kirksville, MO May 1984 Bachelor of Science in Business Administration