Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2000-08-31
2002-10-15
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S749000, C343S803000
Reexamination Certificate
active
06466178
ABSTRACT:
FIELD OF THE INVENTION
The invention concerns an antenna for receiving broadcast signals.
BACKGROUND INFORMATION
Conventional VHF/UHF television broadcast receiving antennas are designed to receive signals from only one direction. They are often referred as “unidirectional antennas.” This unidirectional feature is important primarily because (1) it provides antennas with some front gain and (2) because it rejects undesirable multipath signals, which may cause multipath or “ghost” interference problems. One of the problems associated with conventional unidirectional antennas is that they, especially VHF ones, are relatively large in physical dimensions, having numbers of antenna elements. Therefore, a need exists to develop a relatively small-size unidirectional antenna. It is also preferable to make such a unidirectional antenna capable of receiving both VHF and UHF television broadcast signals.
SUMMARY
In accordance with the invention, a folded dipole antenna has a pair of load resistance elements which are located in the vicinity of the respective edges of the antenna element for obtaining a unidirectional beam pattern.
REFERENCES:
patent: 2247743 (1941-07-01), Beverage
patent: 2533529 (1950-12-01), Spindler
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patent: 6285336 (2001-09-01), Zimmerman
patent: 6323821 (2001-11-01), McLean
J. J. Gibson and R. M. Wilson, “The Mini-state—A small Television Antenna,” IEEE Trans. Consumer Electron., vol. CE-22, No. 2, May 1976, pp. 159-175.
Akiyama Kuniyuki
Chen Shih-Chao
Thomson Licensing S.A.
Tripoli Joseph S.
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