DAVID M COOPER
Engineering in Wayne, NJ
License number
Pennsylvania ET003033
Category
Engineers
Type
Engineer in Training
Address
Address
2
Wayne, NJ 07470
Pennsylvania
Pennsylvania
Professional information
Null Elimination In A Space Diversity Antenna System
US Patent:
6415140, Jul 2, 2002
Filed:
Apr 28, 2000
Appl. No.:
09/561421
Inventors:
James A. Benjamin - Verona NJ
Joseph F. Camerlin - Pequannock NJ
David M. Cooper - Wayne NJ
Joseph F. Camerlin - Pequannock NJ
David M. Cooper - Wayne NJ
Assignee:
BAE Systems Aerospace Inc. - Wayne NJ
International Classification:
H04B 1702
US Classification:
455275, 455273, 455137, 4552761
Abstract:
A space diversity antenna system provided with dither circuitry in the signal path to one of the antennas to switch a circuit element in and out of the signal path at a high rate. The circuit element can be an amplitude attenuator or a phase changer. This switching results in the substantial elimination of nulling between the two antennas.
Band Rejection Filtering Arrangement
US Patent:
4963945, Oct 16, 1990
Filed:
Apr 7, 1989
Appl. No.:
7/334431
Inventors:
David M. Cooper - Wayne NJ
Gerald Lebleboojian - West Caldwell NJ
Gerald Lebleboojian - West Caldwell NJ
Assignee:
Plessey Electronic Systems Corp. - Wayne NJ
International Classification:
H04B 144
US Classification:
455307
Abstract:
A band rejection filtering arrangement utilizing bandpass filters each terminated by a matched load. A quadrature hybrid circuit divides the input signals and applies them to the bandpass filters. Signals within the rejection band are dissipated by the filters and matched loads, whereas desired signals are reflected. The reflected signals are then combined by the quadrature hybrid circuit to provide the band rejected output. This arrangement is made switchable between an all pass mode and the band rejection mode by providing PIN diodes between the quadrature hybrid circuit and the bandpass filters.