Concentric ring log-periodic slot direction finding antenna

Details Concentric ring log-periodic slot direction finding antenna Concentric ring log-periodic slot direction finding antenna

2009-04-07

2011-11-29

Nguyen, Hoang V (Department: 2821)

Communications: radio wave antennas

Antennas

Logarithmically periodic

C343S769000

Reexamination Certificate

active

08068065

ABSTRACT:
A concentric ring, log-periodic slot antenna used for direction finding is disclosed. There are a number of continuous, circular slots nested inside of each other. A cover over the slots cavities has excitation plates and conductors thereon. There are four excitation plates spaced ninety degrees apart over each circular slot, and the excitation plates of all slots in each ninety degree sector are electrically interconnected. A conductor from the interconnected excitation plates in each of the four sectors conducts received signals to a Butler matrix which processes the signals and provides Mode 0, Mode +1, Mode −1, and Mode Δ outputs. These Mode outputs are used to provide direction finding information for DF signal sorting, and they may be used to provide radio frequency voltages to other equipment to provide accurate DF (CIDF) and CIGL transmitter geo-location information.

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Norman Saucier & Keith Struckman, “Direction Finding Using Correlation Techniques”, IEEE Antenna Propagation Society International Symposium, pp. 260-263, Jun. 1975.
R.H. Rumsey, “Frequency Independent Antennas”, Academic Press, New York 1966, pp. 102-105.

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