Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Patent
1989-06-12
1990-10-02
LaRoche, Eugene R.
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
333139, 333161, H03H 720, H01P 1185
Patent
active
049610627
ABSTRACT:
An analog phase shifter is provided by cascading T high pass filter and .pi. low pass filter sections. The low pass filter network is selected to have a cut-off frequency above the highest frequency in a predetermined frequency range of the phase shifter and includes a fixed inductor element as a series element of the network and a pair of variable capacitor elements disposed in shunt between said inductor element and ground. The high pass filter network has a cut-off frequency below the lowest frequency of the predetermined frequency band. The network includes a fixed inductor element disposed as a shunt element of said network and a pair of variable capacitor elements disposed in series. The inductor element is coupled between a common connection of said pair of variable capacitor elements and the reference potential. The .pi. network and the T network are cascaded connected between the pair of terminals of the network. The voltage level is fed to each one of the variable capacitor elements and provides a variable capacitance in response thereto and thus imparts to said network a variable phase shift over the operating frequency range of the phase shifter.
REFERENCES:
patent: 3260968 (1966-07-01), Drapkin
patent: 3778733 (1973-12-01), Rizzi
patent: 4450419 (1984-05-01), Schwarzmann
patent: 4603310 (1986-07-01), Yarman
patent: 4604591 (1986-08-01), Vasile
patent: 4604593 (1986-08-01), Yarman
patent: 4733203 (1988-03-01), Ayasli
patent: 4837532 (1989-06-01), Lang
Garver, R. V., "Broad-Band Diode Phase Shifters", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-20, No. 5, May 1972, pp. 314-323.
G. E. Brehm et al., "High Capacitance Ratio Monolithic Varactor Diode", Proc. 8th Biennial Cornell Elec. Engrg. Cons. 1981 Active Microwave Semiconductor Devices and Circuits, pp. 53-63.
Ham Seung
LaRoche Eugene R.
Maloney Denis G.
Raytheon Company
Sharkansky Richard M.
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