Communications: radio wave antennas – Antennas – Loop type
Reexamination Certificate
2000-05-31
2001-07-03
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Loop type
C343S742000
Reexamination Certificate
active
06255998
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to antenna elements, specifically antenna elements that are pairs of loops one-wavelength in perimeter. Such antenna elements can be used alone or in combinations to serve many antenna needs. One object of the invention is to achieve a superior transmitting and receiving ability, the gain, in some desired direction. Particularly, an object is to enhance that ability at elevation angles close to the horizon. Another object is to decrease the transmitting and receiving ability in undesired directions. Yet another object is to produce antennas that operate satisfactorily over greater ranges of frequencies.
This is the U.S. version of Canadian patent application 2,303,703.
Previous disclosures have shown that loops of conductors approximately one wavelength in perimeter yield advantages over more traditional straight conductors approximately one-half wavelength long. Particularly, these loops produce more gain over wider ranges of frequencies. Since the 1950's, it has been disclosed that pairs of such loops, particularly triangular loops, produce even more gain and reduce radiation in undesired directions even more. This disclosure presents the merit of two-loop antenna elements having shapes similar to the curve that mathematicians call a lemniscate. Those antenna elements will hereinafter be called lemniscate antenna elements.
REFERENCES:
patent: D. 213375 (1969-02-01), Habig
patent: 2537191 (1951-01-01), Moore
patent: 2615005 (1952-10-01), White
patent: 3210767 (1965-10-01), Isbell
patent: 3268899 (1966-08-01), Walden
patent: 3434145 (1969-03-01), Wells
patent: 3573832 (1971-04-01), Callaghan
patent: 5142292 (1992-08-01), Chang
patent: 5319354 (1994-06-01), Myatt
patent: 5805114 (1998-09-01), Podger
Sykes, B., “The Skeleton Slot Aerial System,”The Short Wave Magazine,Jan. 1955, pp. 594-598.
Davey, W. W. “Try A Bi-Loop Antenna,”73 Magazine,Apr. 1979, p. 58.
Hawker, J. Patrick, “Technical Topics, Double-Delta Aerials for VHF and UHF,”Radio Communications,Jun. 1969, pp. 396-397.
Kraus, J. D., “A Small But Effective ‘Flat Top’ Beam,”Radio,Mar. 1937, pp. 56-58.
Podger, J. S., Analysis Results,Double Delta for Comparison.
Podger, J. S., Analysis Results,Lemniscate for Comparison.
Clinger James
Wong Don
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