Communications: radio wave antennas – Antennas – Spiral or helical type
Reexamination Certificate
2006-09-26
2006-09-26
Nguyen, Hoang V. (Department: 2821)
Communications: radio wave antennas
Antennas
Spiral or helical type
C343S853000
Reexamination Certificate
active
07113148
ABSTRACT:
A bifilar helical antenna includes an output/input unit formed by disposing a hybrid on a substrate, wherein the surface of the substrate is coated with a metallic conductive layer; the hybrid is a microstrip-line pattern formed by the conductive layer, and it further comprises a ring part and a plurality of transmission ports; and an antenna unit including a shell and an impedance transformer, wherein the shell is a cylindrical hollow tube disposed on the substrate of the output/input unit, on which a first helical line and a parallel second helical line are wound and both the bottom ends of the helical lines are electrically connected together through a resistor; the impedance transformer is composed of a first transmission line and a parallel second transmission line, where both the top ends of the first and the second transmission line are electrically connected to the top end of the first and the second helical line, and both the bottom ends of the first and the second transmission line are electrically connected to different transmission ports of the hybrid, respectively.
REFERENCES:
patent: 4780727 (1988-10-01), Seal et al.
patent: 6184844 (2001-02-01), Filipovic et al.
patent: 6184845 (2001-02-01), Leisten et al.
patent: 6563469 (2003-05-01), Miyata et al.
patent: 6653987 (2003-11-01), Lamensdorf et al.
patent: 6690336 (2004-02-01), Leisten et al.
patent: 6720935 (2004-04-01), Lamensdorf et al.
Gau Jing-Je
Kiang Jean-Fu
Lan Cheng-Wei
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