Compact coupled line filter circuit

Details Compact coupled line filter circuit Compact coupled line filter circuit

1991-11-18

1993-02-16

Dzierzynski, Paul M.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333246, H01P 1203

Patent

active

051874598

ABSTRACT:
A filter circuit includes a first pair of RF propagation networks disposed to provide a first coupled line section having a first electrical pathlength at a first frequency, means for providing a signal path between an input port of the filter and the first coupled line section and a second pair of RF propagation networks disposed to provide a second coupled line section having a second different electrical pathlength at the first frequency with a first one of the first pair of RF propagation networks coupled to a first one of the second pair of RF propagation network. The filter circuit further includes a third pair of RF propagation networks disposed to provide a third coupled line section having a third different electrical pathlength at the first frequency with a second one of the second pair of RF propagation networks coupled to a first one of the third pair of RF propagation networks and means for providing a signal path between the third coupled line section and an output port of the filter.

REFERENCES:
patent: 4371853 (1983-02-01), Makimoto et al.
Jokela, "Narrow-band stripline filter with Transmission zeros at finite frequencies", Circuit Theory & Applications, vol. 7, No. 4, Oct. 1979, pp. 445-461.
Bahl, "Broadbanding Microstrip filters using capacitive Compensation", Applied Microwave, Aug./Sep. 1989, pp. 70-76.

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