Communications: radio wave antennas – Antennas – Plural antennas spaced a fractional or full wave length apart
Patent
1982-12-06
1984-10-30
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural antennas spaced a fractional or full wave length apart
343853, 343791, H01Q 152
Patent
active
044802552
ABSTRACT:
A method is disclosed whereby adjacent transmitting antenna arrays may be more closely spaced to each other and to receiving antenna arrays while still maintaining a high level of isolation between arrays. In each antenna array, first and second parts thereof are identified. The two parts of each transmitting array are driven in phase quadrature with each other and at substantially equal power levels, and the antenna arrays are spaced sufficiently close to each other so that radiation emitted by one array and received by another array undergoes a cancelling effect before reaching the RF generator associated with the other array. The two parts of each receiver array are coupled to their associated receiver by a signal path such that substantially quadrature phasing is established between the first and second parts thereof to cause received radiation to cancel in the signal path before reaching the receiver.
REFERENCES:
patent: 3375524 (1968-03-01), Kunemund et al.
patent: 3396398 (1968-08-01), Dunlavy
patent: 3534371 (1970-10-01), Seavey
patent: 4083051 (1978-04-01), Woodward
patent: 4213132 (1980-07-01), Davidson
Article entitled "Antenna Systems for 800 MHZ" by William B. Bryson, published in 32nd IEEE Vehicular Technology Conference of May 23-26, 1982.
Gillman James W.
Lieberman Eli
Moore John H.
Motorola Inc.
Roney Edward M.
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