Collapsible wide band width discone antenna

Details Collapsible wide band width discone antenna Collapsible wide band width discone antenna

2007-01-23

2007-01-23

Le, Hoanganh (Department: 2163)

Communications: radio wave antennas

Antennas

Wave guide type

C343S773000

Reexamination Certificate

active

11067417

ABSTRACT:
A collapsible discone antenna is provided with an ultra wide band width by providing a collapsible conical skeleton cone, with the rods of the skeleton being provided with meander lines so as to effectively reduce the overall dimensions of the antenna by a factor of 2, with the antenna rods being electrically interconnected at their distal ends so as to eliminate performance degradation due to varying ground conductivities. A specialized feed configuration is used in one embodiment to feed multiple antennas stacked above a low band disc through the utilization of one or more coaxial lines which are wrapped around a ferrite toroid so that they may be passed up through the low-band disc without detuning the low band discone antenna. The use of the toroid inductor between the low-band cone and the low-band disc further reduces the low frequency cutoff of the antenna by markedly decreasing the VSWR at frequencies as low as 20 megahertz.

REFERENCES:
patent: 3987456 (1976-10-01), Gelin
patent: 4498084 (1985-02-01), Werner et al.
patent: 4656485 (1987-04-01), Werner et al.
patent: 4783665 (1988-11-01), Lier et al.
patent: 4835542 (1989-05-01), Sikina, Jr.
patent: 5317328 (1994-05-01), Allen
patent: 5793334 (1998-08-01), Anderson et al.
patent: 6912341 (2005-06-01), Tietjen

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