Communications: radio wave antennas – Antennas – With terminating resistance at open end
Patent
1977-01-12
1978-09-19
Lieberman, Eli
Communications: radio wave antennas
Antennas
With terminating resistance at open end
343845, 343853, H01Q 148, H01Q 2108
Patent
active
041157800
ABSTRACT:
An antenna consisting of three separate members, two members which are oriented perpendicular to a ground plane which function as short monopole antennas and a third member parallel to and above the ground plane which functions as a single conductor transmission line above ground, top-connecting the two antennas. One of the monopole antennas is connected to the ground plane through a terminating resistor and the other monopole is connected to the ground plane through an impedance matching transformer. The antennas mount on a ground plane, an electrically conducting surface such as the roof of a vehicle, aircraft or other suitable surface, and take an aerodynamic shape. The antenna exhibits a cardioidal pattern over an azimuth angle of approximately 120.degree. and is especially applicable for use in a multiple antenna arrangement in the application of direction finding systems. The antenna is useful over a wide range of frequencies without adjustment, because of its broad bandwidth, which exceeds 100:1.
REFERENCES:
patent: 2894124 (1959-07-01), Himmel et al.
patent: 3605097 (1971-09-01), Barkoczy
Lieberman Eli
Thomas Richard H.
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