Dual-frequency directional antenna and high/low frequency...

Details Dual-frequency directional antenna and high/low frequency... Dual-frequency directional antenna and high/low frequency...

2007-11-13

2007-11-13

Owens, Douglas W. (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S795000, C343S893000

Reexamination Certificate

active

11436224

ABSTRACT:
A dual-frequency directional antenna includes a dielectric substrate, high frequency antenna elements, low frequency antenna elements, symmetrical micro-strip lines and baluns respectively disposed on a front surface and a rear surface of the dielectric substrate. Two ends of a symmetrical micro-strip line are respectively connected to two low frequency antenna elements. The high frequency antenna elements are disposed between two low frequency antenna elements and connected to a symmetric micro-strip line. Each balun is disposed between two high frequency antenna elements, one end of the balun is connected to a middle segment of a symmetrical micro-strip line and the other end is connected to an antenna feeding port. The dual-frequency directional antenna according to the present invention with thin and compact size has dual operating frequency bands property and is applicable for indoor environment.

REFERENCES:
patent: 6037911 (2000-03-01), Brankovic et al.
patent: 2005/0001777 (2005-01-01), Suganthan et al.
patent: 2006/0238433 (2006-10-01), Chou
Faton Tefiku et al, “Design of Broad—Band and Dual-Band antennas Comprised of Series-Fed Printed-Strip Dipole Paris” IEEE Transactions on Antennas and Propagation, vol. 48, No. 6, Jun. 2000, pp. 895-900.

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