Switchable high pass filter/low pass filter phase shifter...

Details Switchable high pass filter/low pass filter phase shifter... Switchable high pass filter/low pass filter phase shifter...

2011-04-19

2011-04-19

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

C333S139000, C333S103000, C333S262000

Reexamination Certificate

active

07928817

ABSTRACT:
A switch circuit in which the cut-off characteristic is improved over a wide range of frequencies in the microwave band includes a first field-effect transistor functioning as a switch element, a second field-effect transistor and an inductor. A serially connected circuit composed of the inductor and second field-effect transistor is connected in parallel with the first field-effect transistor across the source and drain thereof. The second field-effect transistor is turned on when the first field-effect transistor operates normally and is turned off when the first field-effect transistor is inspected.

REFERENCES:
patent: 6674341 (2004-01-01), Hieda et al.
patent: 7239218 (2007-07-01), Nakamura
patent: 2005/0093026 (2005-05-01), Sagae et al.
patent: 2006/0001507 (2006-01-01), Nakamura
patent: 2005-117634 (2005-04-01), None
patent: 2006-19823 (2006-01-01), None
patent: 10-2006-38520 (2006-05-01), None
Korean Office Action dated Mar. 10, 2012 with partial English-language translation of Japanese translation.

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