Electronic phase shifter with enhanced phase shift performance

Details Electronic phase shifter with enhanced phase shift performance Electronic phase shifter with enhanced phase shift performance

2006-03-21

2006-03-21

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

C333S156000, C333S109000

Reexamination Certificate

active

07015773

ABSTRACT:
A varactor based phase shifter that increases phase shift range using a lower characteristic impedance between quadrature ports than is used at its input/output ports. The circuit makes use of a four port coupler arrangement that imbeds a quarter wave impedance transformation between the input port and the quadrature ports as well as between the quadrature ports and the output port. The characteristic impedance across the quadrature ports is therefore less than the characteristic impedance across the input and output ports. In one implementation, reducing a characteristic input/output impedance of 50 to a 20 ohm quadrature port impedance results in a phase shift range increase of more than 50%.

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Birks, T. A., et al., Four-Port Fibre Frequency-Shifter with a Null Taper Coupler [online], 1994 [retrieved on Apr. 28, 2004]. Retrieved from the Internet <URL:http://www.ecs.soton.ac.uk/publications/rj/1994/ofg/birks/birks.html>.
Ellinger, T., “Compact Reflective-Type Phase Shifter MMIC for C-Band Using a Lumped-Element Coupler,”IEEE Transactions on Microwave Theory and Techniques, 49(5):913-917 (2001).

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