Electronic phase shifting circuit for use in a phased radar antenna array
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United States of America Patent
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May 4, 1993
Grant Date -
N/A
app pub date -
Dec 19, 1991
filing date -
Dec 19, 1991
priority date (Note) -
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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.
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