Electrically Controllable Microwave Bipolar Attenuator.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent describes an attenuator which permits manual or electrical control of both amplitude and polarity of a microwave frequency output signal and is referred to throughout this specification as a bipolar attenuator. The input microwave signal is divided with one signal passing through a variable attenuator while the other signal passes through a variable attenuator and a phaseshifter. The phaseshifter provides exact opposition in phase such that when the two signals are equal in amplitude, the output is zero when they are recombined. As the amplitude of one signal changes, the output decreases to zero and increases again with reversed polarity. Two bipolar attenuators in combination with another phaseshifter, a power divider and a power combiner provide 360 degrees phase control.
- Electrical and Electronic Equipment