Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1989-07-31
1991-08-06
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Plural separate diverse type
343813, 343841, 343853, 343890, H01Q 2128
Patent
active
050381512
ABSTRACT:
A stationary, lightweight, easily transportatable antenna capable of full duplex operation, i.e., portions of the antenna can transmit and receive simultaneously in the same frequency band. The antenna has a near omnidirectional pattern in the azimuth plane for both transmit and receive. The receive portion (2) consists of four antenna elements (20), each having a beamwidth in the azimuth plane slightly greater than 90.degree.. The receive antennas (20) are arranged symmetrically about a midpoint (93) that lies in the azimuth plane. The beams of the four receive antennas (20) face outwardly away from the midpoint (93) and thereby cover the full azimuth plane. The transmit portion (1) of the antenna is a colinear set of dipole elements (12) arranged within a cylinder (11) that is orthogonal to the azimuth plane and centered on said midpoint (93). A nulling circuit (3) intrinsic to the receive portion (2) provides further isolation between transmit and receive, by means of phasing geometrically opposing receive antennas (20) 180.degree. out-of-phase with respect to each other.
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ARRL Handbook 55th Ed., published by the ARRL, Newington, CT, 1978, pp. 437,438.
Antenna engineering Handbook, Johnson & Jasik Eds., McGraw Hill Book Co., 2D Ed., 1984 (Excerpts enclosed).
Fernandez Dennis S.
Loral Aerospace Corp.
Radlo Edward J.
Wimer Michael C.
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