Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2006-09-12
2006-09-12
Nguyen, Hoang V. (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C342S361000
Reexamination Certificate
active
07106269
ABSTRACT:
A relative phase shift is induced in the signals of a pair of identical orthogonal antennas such that when the signals are combined the signals are 90 degrees out of phase. This is done in order to eliminate the null along the axis between the two dipole moments of the antennas such that the system has equally good reception from all azimuth angles over a broad range of frequencies. The phase shift is accomplished with the use of single pole operational amplifier circuits whose pole frequencies are adjusted by means of a potentiometer prior to implementation of the antenna system.
REFERENCES:
patent: 4209791 (1980-06-01), Gerst et al.
patent: 4697191 (1987-09-01), Cross
patent: 5343173 (1994-08-01), Balodis et al.
patent: 5943012 (1999-08-01), Sinclair
patent: 6445357 (2002-09-01), Sinclair
Kasaschke James M.
Nasser Jean-Paul A.
Nguyen Hoang V.
Stanley Michael P.
The United States of America as represented by the Secretary of
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