Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-03-16
1979-04-03
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
H04B 700
Patent
active
041480317
ABSTRACT:
An active retrodirective antenna array wherein a reference array element is used to generate a phase reference which is replicated at succeeding elements of the array. Each element of the array is associated with a phase regeneration circuit and the phase conjugation circuitry of an adjacent element. In one implementation, the phase reference circuit operates on the input signal at the reference element, a voltage controlled oscillator (VCO) output signal and the input pilot signal at the next array element received from a transmission line. By proper filtering and mixing, a phase component may be produced to which the VCO may be locked to produce the phase conjugate of the pilot signal at the next array element plus a transmission line delay. The same phase conjugation process occurs at the next element where the proper phase reference is regenerated by mixing samples of the input pilot and transmitted signal. In another implementation, particularly suited for large arrays in space, two different input pilot frequencies are employed. Their difference is the phase reference of the system, and a local oscillator is used in obtaining this difference, which is in the IF range. The two pilot frequencies are selected in accordance with particular criteria to insure proper phase addition and elimination of local oscillator components. Appropriate mixing and filtering is performed to achieve phase conjugation and phase reference replication.
REFERENCES:
patent: 3259902 (1966-07-01), Malech
patent: 3305864 (1967-02-01), Ghose
patent: 3350642 (1967-10-01), Stahler
patent: 3422438 (1969-01-01), Marston
patent: 3611381 (1971-10-01), Preikschat et al.
patent: 3757334 (1973-09-01), Raabe
patent: 3789417 (1974-01-01), Coleman
patent: 3803618 (1974-04-01), Coleman
Chernoff Ralph C.
Fletcher James C.
Tausworthe Robert C.
Blum Theodore M.
Manning John R.
McCaul Paul F.
Mott Monte F.
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