Compact broadband antenna with constant radiation pattern

Details Compact broadband antenna with constant radiation pattern Compact broadband antenna with constant radiation pattern

2008-01-22

2008-01-22

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

Plural antennas

C343S810000

Reexamination Certificate

active

07321341

ABSTRACT:
An antenna having multiple antenna elements of unequal lengths, form in a conical shape. The longest antenna element has a trap in a specific location of the antenna element. Multiple traps can be used for extended coverage depending upon the frequency band. The antenna elements are connected together through a transversal-wire ring and a feed transmission line is attached to it. The antenna occupies minimal footprint in the horizontal direction and maintains a low VSWR and a uniform beam pattern over a wide frequency band, more than 1:20. The antenna has a constant radiation pattern over a 1:6 bandwidth and the pattern bandwidth may be increased using more antenna elements and traps. The elevation and azimuth patterns show a consistent characteristic from 100 MHz to 600 MHz.

REFERENCES:
patent: 5990845 (1999-11-01), Sharp et al.
patent: 6198454 (2001-03-01), Sharp et al.

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