Parasitic dipole for azimuth uniformity in broadband...

Details Parasitic dipole for azimuth uniformity in broadband... Parasitic dipole for azimuth uniformity in broadband...

2006-05-02

2009-06-02

Chen, Shih-Chao (Department: 2821)

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

C343S770000, C343S797000

Reexamination Certificate

active

07542004

ABSTRACT:
A horizontally polarized, substantially omnidirectional broadband transmitting antenna uses parasitic dipoles to increase azimuthal circularity over frequency. Because the magnitude of nulls in the field strength increases with frequency, the dipoles are preferentially sized for optimum reradiation at the highest frequency expected for the antenna. For maximum reinforcement of signal strength in the nulls, the longitudinal axes of the dipoles in a preferred embodiment lie in the center planes of the multiple bays of the antenna, are perpendicular to the proximal axes of radiation, and are centered on the nulls. The dipoles are suitable for use with several antenna styles, and are expressly compatible with crossed bowtie slot antennas.

REFERENCES:
patent: 4583098 (1986-04-01), Sikina, Jr.
patent: 5497166 (1996-03-01), Mahnad
patent: 6078288 (2000-06-01), Adams et al.
patent: 6762729 (2004-07-01), Egashira
patent: 6762730 (2004-07-01), Schadler
patent: 2006/0033670 (2006-02-01), Schadler

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