Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Patent
1991-12-19
1993-05-04
Pascal, Robert J.
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
333161, H01P 1185
Patent
active
052085643
ABSTRACT:
A phase shifting circuit (10) which is especially suitable for use as a 180.degree. phase bit for an antenna element in a phased radar antenna array includes a first transmission line (16) connected between first and second diodes (22,24), which are connected to input and output terminals (12,14) respectively. Second and third transmission lines (18,20) are connected in series with each other between the input and output terminals (12,14). A third diode (26) is connected between the junction (28) of the second and third transmission lines (18,20) and ground. The first transmission line (16) is less than one-quarter wavelength long at the operating frequency of the circuit (10), whereas the second and third transmission lines (18,20) are each approximately three-eighths wavelength long. Forward biasing the diodes (22,24,26) causes substantially all of the signal to propagate from the input terminal (12) to the output terminal (14) through the first transmission line (16), producing minimum phase shift. Reverse biasing the diodes (22,24,26) causes a major portion of the signal to propagate through the second and third transmission lines (18,20), producing maximum phase shift.
REFERENCES:
patent: 3718873 (1973-02-01), Garver
patent: 3982214 (1976-09-01), Burns
patent: 4630010 (1986-12-01), Yarman
Atkinson Darren E.
Burns Richard W.
Denson-Low Wanda K.
Ham Seung
Hughes Aircraft Company
Pascal Robert J.
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