Communications: radio wave antennas – Antennas – Plural antennas spaced a fractional or full wave length apart
Patent
1993-01-08
2000-06-13
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Plural antennas spaced a fractional or full wave length apart
342448, H01Q 2108, G01S 504
Patent
active
060754982
ABSTRACT:
A surface wave directional detection system for determining the direction in which an electromagnetic wave propagating along a metallic surface is travelling includes a first loop probe and a second loop probe positioned in close proximity to the metallic surface so that the electromagnetic wave induces a signal in each of the loop probes. The two loop probes are separated by a quarter wavelength so that the two signals induced in the probes are out of phase. The first and second loop probes are connected by equal length transmission lines to a quadrature hybrid which generates two output signals that vary in magnitude in correspondence with the direction of travel of the electromagnetic surface wave. The two output signals from the quadrature hybrid are provided to RF detectors, which generate output voltage signals that vary in proportion to the magnitude of the output signals from the quadrature hybrid. The outputs of the RF detectors are connected to a comparator, which compares the output voltage signals from the RF detectors and generates an output signal which is indicative of the direction of travel of the electromagnetic surface wave.
REFERENCES:
patent: 1947247 (1934-02-01), Bruce
patent: 4063250 (1977-12-01), Fenwick
patent: 4414550 (1983-11-01), Tresselt
patent: 4611212 (1986-09-01), Lee
American Nucleonics Corp.
Wimer Michael C.
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