Method and apparatus for adjusting the impedance of a microstrip

Details Method and apparatus for adjusting the impedance of a microstrip Method and apparatus for adjusting the impedance of a microstrip

1992-12-23

1994-10-18

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333246, 333263, 3613011, H01P 118, H01P 100

Patent

active

053572254

ABSTRACT:
An interdigital capacitor (10) is provided including a plurality of conductive and dielectric finger regions. The conductive finger regions are made of the same material type as a microstrip transmission line (12). The conductive finger regions are comprised of individual conductive fingers (14) and the individual conductive fingers (14) provide a predetermined level of impedance to the microstrip transmission line. The plurality of conductive finger regions are comprised of a first finger region (18) and a second finger region (20). The first finger region (18) is coupled to the microstrip transmission line (12) and the second conductive finger region (20) is coupled to ground (22). The individual conductive fingers (14) of the first conductive region (18) are located parallel and interspersed with the individual conductive fingers (14) of the second conductive finger region (20). Because the individual fingers (14) of the conductive finger region provide a predetermined level of impedance to the interdigital capacitor (10), the value of the interdigital capacitor (10) can be adjusted by a known amount by removing one or more individual conductive fingers (18) . This in turn provides a known response in the phase of a signal travelling on the microstrip transmission line (12).

REFERENCES:
patent: 3538459 (1970-11-01), Knerr
patent: 4388599 (1983-06-01), Gautier et al.
patent: 4721931 (1988-01-01), Nishikawa et al.
patent: 5105173 (1992-04-01), Itou

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