Wave transmission lines and networks – Attenuators
Patent
1993-12-22
1995-02-21
Gensler, Paul
Wave transmission lines and networks
Attenuators
333109, 333164, 333 81A, H01P 122
Patent
active
053920090
ABSTRACT:
A low current vector modulator for continuously varying the amplitude and polarity of an RF signal includes first and second hybrid couplers electrically connected at their input ports to an RF source. The characteristic impedance of the hybrid couplers is twice the impedance of the RF source. First and second PIN diodes are electrically coupled to 0.degree. and 90.degree. phase ports of the first hybrid coupler, respectively, and third and fourth PIN diodes are electrically coupled to 0.degree. and 90.degree. phase ports of the second hybrid coupler, respectively. The first and second PIN diodes and the third and fourth PIN diodes also are electrically connected respectively to first and second biasing sources. Varying the biasing provided by the first and second biasing sources varies the amplitude and phase of first and second output signals generated by the first and second hybrid couplers. A third hybrid coupler is electrically coupled at its first and second input ports to the output ports of the first and second hybrid couplers, respectively. The third hybrid coupler is responsive to the first and second output signals and generates an output signal which varies in amplitude and phase in response to the resistance of the first, second, third and fourth PIN diodes.
REFERENCES:
patent: 4016516 (1977-04-01), Sauter et al.
American Nucleonics Corporation
Gensler Paul
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