Laser tuning of ceramic bandpass filter

Details Laser tuning of ceramic bandpass filter Laser tuning of ceramic bandpass filter

1991-11-01

1993-03-30

Dzierzynski, Paul M.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333235, H01P 1202

Patent

active

051987880

ABSTRACT:
A laser tuning method for tuning a ceramic passband filter comprises forming an untuned filter that includes at least one metallized element, such as a resonator pad, formed of an undersized metal plate. A thick film of a metal powder paste is applied to the filter adjacent to the undersized plate. The paste film is scanned with a laser beam to sinter the metal particles into an integral plate, thereby adjusting the size and shape of the element to obtain a desired performance characteristic. In one aspect of this invention, an output signal in response to a test signal is monitored while laser scanning the paste film, whereupon the laser beam is discontinued when the desired characteristic has been obtained.

REFERENCES:
patent: 4431977 (1984-02-01), Sokola
patent: 4800348 (1989-01-01), Rosar et al.
patent: 4965537 (1990-10-01), Kommrusch
patent: 5004992 (1991-04-01), Grieco et al.

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