Optically controlled phase shifter and phased array antenna for

Details Optically controlled phase shifter and phased array antenna for Optically controlled phase shifter and phased array antenna for

1996-08-16

1997-12-02

Bovernick, Rodney B.

Optical waveguides

With optical coupler

385 3, 385 5, 385 14, 385 49, 343700MS, 343853, 342200, 342368, G02B 628, G02F 1295

Patent

active

056944985

ABSTRACT:
Systems and methods for optically controlled phase shifters are described. An apparatus includes a proximal rib waveguide; a phase shifter connected to the proximal rib waveguide, the phase shifter including: a first plasma induced modulator connected to the proximal rib waveguide, the first plasma induced modulator having a first transmission coefficient a and including: a first branch waveguide connected to the proximal rib waveguide; and a first photosensitive semiconductive plasma injector connected to the first branch waveguide; a second plasma induced modulator connected to the proximal rib waveguide, the second plasma induced modulator having a second transmission coefficient b and including: a second branch waveguide connected to the proximal rib waveguide; and a second photosensitive semiconductive plasma injector connected to the second branch waveguide; and a third plasma induced modulator connected to the proximal rib waveguide, the third plasma induced modulator having a third transmission coefficient c and including: a third branch waveguide connected to the proximal rib waveguide; and a third photosensitive semiconductive plasma injector connected to the third branch waveguide. The transmission coefficients a, b and c are each .ltoreq.1. The systems and methods provide a substantial improvement in that a phased array antenna can be steered with the optically controlled phase shifters using much less controlling energy.

REFERENCES:
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patent: 5315422 (1994-05-01), Utaka et al.
patent: 5333000 (1994-07-01), Hietala et al.
Phase Shift and Loss Mechanism of Optically Excited E-plane Electron-Hole Plasma, Ao Sheng Rong and Zhong Liang Sun; Dept. of Radio Engineering, Southeast University, pp. 543-544, 1993.
Theory of Optically Controlled Millimeter-Wave Phase Shifters, Aileen M. Vaucher, Cahrles D. Striffler, Chi H. Lee; IEEE, Transactions on Microwave Theory and Techniques 1983, pp. 209-216.
Optically Controllable Millimeter Wave Phase Shifter; A.P. DeFonzo, Chi H. Lee, P.S. Mak; American Institute of Physics (1979); pp. 575-577.
Optical Control of Millimeter-Wave Propagation in Dielectric Waveguides, Chi H. Lee, Paul S. Mak, and A.P. DeFonzo; IEEE Journal of Quantum Electronics, vol. QE-16, No. 3, Mar. 1980. pp. 277-288.
Nonumiform Layer Model of a Millimeter-Wave Phase Shifter; Jerome K. Butler, Tran-Fu Wu, Marion W. Scott; IEEE Transactions on Microwave Theory and Techniques, vol. MTT-34, No. 1, Jan. 1986.

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