Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1996-08-19
1998-11-24
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343818, 343890, H01Q 2112
Patent
active
058414061
ABSTRACT:
The present invention is an improved Yagi-Uda style antenna. Primarily, the present invention provides that at least two driven elements are spaced approximately 0.1 .lambda. apart from each other. The driven elements are forced into a critical couple mode by electrically connecting the two driven elements with a matched phasing delay line. The phasing delay line retards the phase current sufficiently to, coupled with the specified element separation, satisfy both the endfire condition and the Hansen-Woodyard condition. This provides for increased directivity and gain, and deep nulls in the field strength. The at least two critically coupled elements compromise at least a first driven element, which is the primary broadcast element, and a second driven element, which is a driven reflector element. The reflector element acts to augment field strength in a direction toward the first driven element and reduce field strength in a direction away from the first driven element. The present invention may include the use of at least one parasitic director elements. These are elements that are not electrically coupled to the driven elements, but are inductively coupled. The present invention further provides an antenna with a greatly reduced loss resistance component. The present invention reduces nonradiative resistance losses with an element mounting saddle that incorporates an enlarged conductive contact surface area. This enlarged conductive contact surface area is designed to conform with the surface of the radiative element to be mounted on the saddle. By increasing the conductive contact surface area, current density at any one point in the contact is reduced. This allows larger currents to flow through the contact area with less resistance heating.
REFERENCES:
patent: 2688083 (1954-08-01), Hills
patent: 2701308 (1955-02-01), Kay
patent: 2772413 (1956-11-01), Guernsey et al.
patent: 2980912 (1961-04-01), Anderson
patent: 3392399 (1968-07-01), Winegard
patent: 3475759 (1969-10-01), Winegard
patent: 3683391 (1972-08-01), Callaghan
patent: 4398201 (1983-08-01), Winegard et al.
Ho Tan
Le Hoanganh T.
Moy Jeffrey D.
Weiss Harry M.
LandOfFree
Critically coupled bi-periodic driver antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Critically coupled bi-periodic driver antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Critically coupled bi-periodic driver antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1708097