Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-02-25
1978-09-12
Moskowitz, Nelson
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 328
Patent
active
041141571
ABSTRACT:
A bearing detection system used in an Airborne Collision Avoidance System. The detection end of the system is formed as a directional antenna having 3 directional antenna elements extending radially at a 120.degree. angle with each other. The antenna element has an actual length corresponding to .lambda./8, wherein .lambda. is the wavelength of the receiving wave, but the element has an effective length corresponding to .lambda./4 by the provision of an impedance matching plate and a back lobe suppression plate. Bearings of the incoming wave can be detected by means of relative strength of the receiving signal levels of the three antenna elements obtained by amplitude comparison and by forming 3 bit truth table for six directions including the 3 directions of the antenna and 3 boundary directions thereof by the strength of the receiving signal received by the three antenna elements.
REFERENCES:
patent: 3329956 (1967-07-01), Caspers
patent: 3465342 (1969-09-01), Delapalme
Berger Richard E.
Moskowitz Nelson
Toyo Ysushinki Kabushiki Kaisha
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