Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Reexamination Certificate
2005-01-04
2005-01-04
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
C343S792500, C343S793000, C343S803000, C343S815000
Reexamination Certificate
active
06839038
ABSTRACT:
An antenna having a dual-band driven element and a second antenna element simultaneously produces a directional radiation pattern at an upper frequency and an omnidirectional radiation pattern at a lower frequency. The dual-band driven element is formed as a dipole or monopole with at least one choke connected to the end of the dipole or monopole. In an exemplary embodiment, the dual-band driven element includes a central dipole or monopole that has chokes formed as u-shaped extensions located at the ends of the central antenna dipole or monopole. An antenna array includes the dual-band driven element and a second driven antenna element with a reflector and/or a director in a Yagi-Uda configuration. An antenna array includes the dual-band driven element with a reflector or with a reflector and a director in a Yagi-Uda configuration.
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Tefiku F., et al., “Design Of Broad-Band And Dual-Band Antennas Comprised Of Series-Fed-Printed-Strip Dipole Pairs”, IEEE Transactions On Antennas And Propagation, IEEE Inc., NY, USA, vol. 48, No. 6, Jun. 2000 pp. 895-900, XP000959047.
Lockheed Martin Corporation
Phan Tho
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