Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1980-05-14
1990-04-17
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
342 42, 343807, 343853, G01S 1374, H01Q 300
Patent
active
049184580
ABSTRACT:
A secondary radar transponder on a mobile target has an antenna arrangement which can receive interrogation signals from all directions and radiate reply signals. The antenna arrangement includes several individual antennas, each of which, with its primary lobe, covers a specific sector of the entire 360.degree. range and is connected to a receiver, so that through receiving level comparison, that particular sector from which the interrogation signal incides can be ascertained. The reply signal is then radiated only by the individual antenna covering that particular sector. The transponder is particularly suited for identification friend-foe (IFF) purposes.
REFERENCES:
patent: 2234244 (1941-03-01), Gossel
patent: 3274598 (1966-09-01), Cleeton
patent: 3500406 (1970-03-01), Parker
patent: 4114163 (1978-09-01), Borowick
patent: 4151532 (1979-04-01), Kaloi
Brunner Anton
Kristkoiz Karl-Heinz
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